Electronic circuit and computing device

Abstract

An electronic circuit and a computing device capable of improving characteristics are provided. According to an embodiment, an electronic circuit includes a first qubit, a second qubit, a first coupler, a first readout conductive member, and a first filter. The first coupler includes a first resonator and a second resonator. The first resonator is capable of coupling with the first qubit. The second resonator is capable of coupling with the second qubit. The first filter includes a first filter portion, a first other filter portion, and a first readout portion. The first filter portion is capable of coupling with the first resonator. The first other filter portion is capable of coupling with the second resonator. The first readout portion is capable of coupling with the first readout conductive member.

Description

[0001] This application is based on Japanese Patent Application 2022-109576 (filed on July 7, 2022), under which it enjoys priority benefits. This application incorporates the entire contents of that application by reference. Technical Field

[0002] Embodiments of the present invention relate to electronic circuits and computing devices. Background Technology

[0003] For example, electronic circuits that include multiple nonlinear elements are used in computing devices. There is a desire to improve the performance of electronic circuits and computing devices. Summary of the Invention

[0004] Embodiments of the present invention provide electronic circuits and computing devices that can improve performance.

[0005] Technical solutions for solving the problem

[0006] According to an embodiment of the present invention, an electronic circuit includes a first qubit, a second qubit, a first coupler, a first readout conductive component, and a first filter. The first coupler includes a first resonator and a second resonator. The first resonator is capable of coupling to the first qubit. The second resonator is capable of coupling to the second qubit. The first filter includes a first filter section, a first other filter section, and a first readout section. The first filter section is capable of coupling to the first resonator. The first other filter section is capable of coupling to the second resonator. The first readout section is capable of coupling to the first readout conductive component.

[0007] Based on the above-described structure, electronic circuits and computing devices with improved characteristics can be provided. Attached Figure Description

[0008] Figure 1 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0009] Figure 2 This is a circuit diagram illustrating the electronic circuit according to the first embodiment.

[0010] Figure 3 This is a schematic diagram illustrating the characteristics of the electronic circuit according to the first embodiment.

[0011] Figure 4 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0012] Figure 5 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0013] Figure 6 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0014] Figure 7 (a)~ Figure 7 (e) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0015] Figure 8 (a)~ Figure 8 (c) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0016] Figure 9 (a) and Figure 9 (b) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0017] Figure 10 (a) and Figure 10 (b) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0018] Figure 11 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0019] Figure 12 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0020] Figure 13 This is a schematic cross-sectional view illustrating the electronic circuit according to the first embodiment.

[0021] Figure 14 This is a graph illustrating the characteristics of the electronic circuit according to the first embodiment.

[0022] Figure 15 This is a graph illustrating the characteristics of the electronic circuit according to the first embodiment.

[0023] Figure 16 This is a schematic diagram illustrating the electronic circuit according to the first embodiment.

[0024] Figure 17 This is a schematic diagram illustrating the electronic circuit according to the first embodiment.

[0025] Figure 18 This is a schematic diagram illustrating the electronic circuit and computing device involved in the second embodiment.

[0026] Label Explanation

[0027] Couplers 1 through 3 of 10A to 10B;

[0028] 10LP ring;

[0029] 11C, 12C capacitor 1 and capacitor 2;

[0030] 11J and 12J: First resonator Josephson junction and second resonator Josephson junction;

[0031] 11K first coupler Josephson junction;

[0032] 11L and 12L, first and second inductors;

[0033] 11R~16R, the first to the sixth resonator;

[0034] 11a, 12a First resonator conductive part, second resonator conductive part;

[0035] 21-23 First readout conductive component to third readout conductive component;

[0036] Filters 1 through 33F;

[0037] Filter sections 1 to 3 of 31P to 33P;

[0038] 31Q~33Q First Other Filter Section~Third Other Filter Section;

[0039] 31R~33R First Readout Part~Third Readout Part;

[0040] 41-43 First conductive component to third conductive component;

[0041] 41f, 42f - First filter resonator, second filter resonator;

[0042] 41J~43J First conductive component Josephson junction~Third conductive component Josephson junction;

[0043] 41p, 42p, first conductive portion, second conductive portion;

[0044] 41q, 42q, first other conductive portion, second other conductive portion;

[0045] 50p bandwidth;

[0046] 50r, 50s: First non-passband, Second non-passband;

[0047] 51B~54 qubits 1 to 4;

[0048] 51C and 52C, capacitor 1 and capacitor 2;

[0049] 51J, 52J: 1st Josephson knot, 2nd Josephson knot;

[0050] 51a, 52a, first conductive part and second conductive part;

[0051] 60. Flux Control Unit;

[0052] 61. Control the conductive parts;

[0053] 65A and 65B: 1st qubit control unit and 2nd qubit control unit;

[0054] 70. Control Department;

[0055] 70P Signal Processing Unit;

[0056] 70R readout circuit;

[0057] 81, 82 1st base body, 2nd base body;

[0058] 81F, 82F side 1, side 2;

[0059] 85. Conductive layer;

[0060] 85G grounding conductive layer;

[0061] 85a~85p conductive film;

[0062] 86a~86h insulating film;

[0063] 87. Conductive layer;

[0064] 88. Conductive layer;

[0065] Φ magnetic flux;

[0066] Electronic circuits 110-112, 120, 121, and 130;

[0067] 210 computing device;

[0068] Capacitors C1 to C6;

[0069] GND grounding potential;

[0070] Sb1, Sb2: control signals for the first and second qubits;

[0071] Sig1 output signal;

[0072] SIg2 value;

[0073] Sr1~Sr3: First readout signal~Third readout signal;

[0074] Tr pass rate;

[0075] V1~V3, first read value~third read value;

[0076] f10A resonant frequency;

[0077] f50 frequency;

[0078] fr1 frequency Detailed Implementation

[0079] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0080] The accompanying drawings are schematic or conceptual, and the relationships between the thickness and width of the parts, the ratios between the sizes of the parts, etc., are not necessarily limited to the same situation as reality. Even when representing the same parts, they are sometimes represented by different dimensions and ratios depending on the drawings. In this specification and the drawings, the same reference numerals are used for elements that have been described with respect to the preceding drawings, and detailed descriptions are omitted where appropriate.

[0081] (First Embodiment)

[0082] Figure 1 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0083] like Figure 1 As shown, the electronic circuit 110 involved in the embodiment includes a first qubit 51B, a second qubit 52B, a first coupler 10A, a first readout conductive component 21, and a first filter 31F.

[0084] The first coupler 10A includes a first resonator 11R and a second resonator 12R. The first resonator 11R is capable of coupling to a first qubit 51B. The second resonator 12R is capable of coupling to a second qubit 52B. For example, the first resonator 11R is capable of electromagnetic coupling to the first qubit 51B. For example, the second resonator 12R is capable of electromagnetic coupling to the second qubit 52B. Electromagnetic coupling includes, for example, capacitive coupling. Electromagnetic coupling includes, for example, inductive coupling. The first coupler 10A is, for example, a tunable coupler.

[0085] The first filter 31F includes a first filter section 31P, a first other filter section 31Q, and a first readout section 31R. The first filter section 31P can be coupled to the first resonator 11R. The first other filter section 31Q can be coupled to the second resonator 12R. The first readout section 31R can be coupled to the first readout conductive component 21. The first filter 31F can be, for example, a Purcell filter.

[0086] In this embodiment, the state of the qubit is read out by the first readout conductive member 21 via the first filter 31F. Thus, for example, it is possible to arrange qubits and couplers at a high density.

[0087] For example, in the first reference example, the state of the qubit is read out via a readout resonator. In the first reference example, the area of ​​the readout resonator is large, requiring space. Therefore, it is difficult to arrange multiple qubits at a high density.

[0088] In contrast, in this embodiment, the resonator included in the first coupler 10A is coupled to the first filter 31F. The state of the qubit is read out via the coupler and the first filter 31F. In this embodiment, the readout resonator can be omitted. Space saving is achieved. High-density qubits can be obtained. According to this embodiment, electronic circuitry that improves performance can be provided.

[0089] like Figure 1 As shown, in this example, the first filter 31F includes a first conductive component 41 and a second conductive component 42. The first conductive component 41 includes a first conductive portion 41p and a first other conductive portion 41q. The second conductive component 42 includes a second conductive portion 42p and a second other conductive portion 42q. The first conductive portion 41p can be coupled to the first resonator 11R. The second conductive portion 42p can be coupled to the second resonator 12R. The first other conductive portion 41q can be coupled to the first readout conductive component 21. The second other conductive portion 42q can be coupled to the first readout conductive component 21.

[0090] The first conductive portion 41p corresponds to the first filter portion 31P. The second conductive portion 42p corresponds to the first other filter portion 31Q. At least one of the first other conductive portion 41q and the second other conductive portion 42q corresponds to the first readout portion 31R.

[0091] The first qubit 51B, the second qubit 52B, the first coupler 10A, the first readout conductive component 21, and the first filter 31F can, for example, be formed by a conductive layer 85 disposed on the first surface 81F of the first substrate 81. As will be described later, at least a portion of the conductive layer 85 can also be disposed on different substrates.

[0092] like Figure 1 As shown, the first coupler 10A includes a first coupler Josephson junction 11K. One end of the first coupler Josephson junction 11K is connected to the first resonator 11R. The other end of the first coupler Josephson junction 11K is connected to the second resonator 12R.

[0093] The first resonator 11R includes a first inductor 11L. The second resonator 12R includes a second inductor 12L. In this example, the first resonator Josephson junction 11J is used as the first inductor 11L. In this example, the second resonator Josephson junction 12J is used as the second inductor 12L.

[0094] The first resonator 11R is, for example, a first transmon resonator. The second resonator 12R is, for example, a second transmon resonator. The first coupler 10A is, for example, a dual transmon coupler.

[0095] A first resonator conductive section 11a is provided, which is connected to the first inductor 11L (the first resonator Josephson junction 11J). A second resonator conductive section 12a is provided, which is connected to the second inductor 12L (the second resonator Josephson junction 12J).

[0096] The first filter portion 31P of the first filter 31F can be coupled to the first resonator conductor 11a. The first other filter portion 31Q of the first filter 31F can be coupled to the second resonator conductor 12a. The first resonator conductor 11a and the first inductor 11L (the first resonator Josephson junction 11J) are contained in the first resonator 11R. The second resonator conductor 12a and the second inductor 12L (the second resonator Josephson junction 12J) are contained in the second resonator 12R.

[0097] like Figure 1 As shown, the first qubit 51B includes a first Josephson junction 51J and a first conductive portion 51a. The first conductive portion 51a is connected to the first Josephson junction 51J. The second qubit 52B includes a second Josephson junction 52J and a second conductive portion 52a. The second conductive portion 52a is connected to the second Josephson junction 52J.

[0098] The first conductive part 51a can be coupled to the first resonator conductive part 11a. The second conductive part 52a can be coupled to the second resonator conductive part 12a.

[0099] A ground conductive layer 85G based on the conductive layer 85 can be provided. The ground conductive layer 85G is set to a ground potential GND (e.g., a reference potential). For example, the ground conductive layer 85G can be provided around the conductive layer 85, which serves as the first qubit 51B, the second qubit 52B, the first coupler 10A, the first readout conductive member 21, and the first filter 31F.

[0100] like Figure 1As shown, a readout circuit 70R can be provided. For example, the readout circuit 70R can be included in the electronic circuit 110. The readout circuit 70R can also be provided separately from the electronic circuit 110. The readout circuit 70R is electrically connected to the first readout conductive member 21. The readout circuit 70R can detect the state of the first qubit 51B and the state of the second qubit 52B based on the signal obtained from the first readout conductive member 21. For example, the readout circuit 70R detects the output signal based on the input signal input to the first readout conductive member 21. Thus, the state of the first qubit 51B and the state of the second qubit 52B can be detected. The readout circuit 70R outputs an output signal Sig1 including the detection result.

[0101] Figure 2 This is a circuit diagram illustrating the electronic circuit according to the first embodiment.

[0102] like Figure 2 As shown, the first resonator 11R includes a first inductor 11L and a first capacitor 11C. The first capacitor 11C is connected in parallel with the first inductor 11L. As already explained, in this example, a first resonator Josephson junction 11J is provided as the first inductor 11L. The first capacitor 11C is connected in parallel with the first resonator Josephson junction 11J.

[0103] The second resonator 12R includes a second inductor 12L and a second capacitor 12C. The second capacitor 12C is connected in parallel with the second inductor 12L. As already described, in this example, a second resonator Josephson junction 12J is provided as the second inductor 12L. The second capacitor 12C is connected in parallel with the second resonator Josephson junction 12J.

[0104] The first coupler 10A also includes a first coupler Josephson junction 11K. One end of the first coupler Josephson junction 11K is connected to one end of the first inductor 11L and one end of the first capacitor 11C. The other end of the first coupler Josephson junction 11K is connected to one end of the second inductor 12L and one end of the second capacitor 12C.

[0105] The other end of the first inductor 11L and the other end of the first capacitor 11C are set to ground potential GND. The other end of the second inductor 12L and the other end of the second capacitor 12C are set to ground potential GND.

[0106] The first inductor 11L includes at least one first resonator Josephson junction 11J. The first inductor 11L may also include multiple first resonators Josephson junctions 11J. The second inductor 12L includes at least one second resonator Josephson junction 12J. The second inductor 12L may also include multiple second resonators Josephson junctions 12J.

[0107] The first qubit 51B includes a first Josephson junction 51J and a first capacitor 51C. The first capacitor 51C is connected in parallel with the first Josephson junction 51J. One end of the first Josephson junction 51J and one end of the first capacitor 51C are connected to the first conductor 51a. The first conductor 51a can be coupled to the first resonator conductor 11a. The other ends of the first Josephson junction 51J and the first capacitor 51C are set to ground potential GND.

[0108] The second qubit 52B includes a second Josephson junction 52J and a second capacitor 52C. The second capacitor 52C is connected in parallel with the second Josephson junction 52J. One end of the second Josephson junction 52J and one end of the second capacitor 52C are connected to the second conductor 52a. The second conductor 52a can be coupled to the second resonator conductor 12a. The other ends of the second Josephson junction 52J and the second capacitor 52C are set to ground potential GND.

[0109] Capacitor C1 can be formed by the first conductive part 51a and the first resonator conductive part 11a. Capacitor C2 can be formed by the second conductive part 52a and the second resonator conductive part 12a.

[0110] The first conductive component 41 can be considered, for example, as a parallel-connected LC circuit. The first conductive component 41 corresponds, for example, to the first filter resonator 41f. The second conductive component 42 can be considered, for example, as a parallel-connected LC circuit. The second conductive component 42 corresponds, for example, to the second filter resonator 42f. These LC circuits are waveguide resonators.

[0111] In one example, the resonant frequency of the first qubit 51B is approximately 8.3 GHz. The resonant frequency of the second qubit 52B is approximately 9.0 GHz. The resonant frequency of the first resonator 11R is approximately 11.0 GHz. The resonant frequency of the second resonator 12R is approximately 11.7 GHz. The frequencies of the first resonator 11R and the second resonator 12R are different. The resonant frequencies of the first resonator 11R and the second resonator 12R are read out via the first filter 31F. The resonant frequencies of the first qubit 51B and the second qubit 52B are substantially cut off by the first filter 31.

[0112] In one implementation, for example, the resonant frequency of the first resonator 11R is higher than the resonant frequency of the first qubit 51B. The resonant frequency of the second resonator 12R is higher than the resonant frequency of the second qubit 52B.

[0113] like Figure 2As shown, a ring 10LP is provided in the first coupler 10A. The ring 10LP includes a conductive path containing the first coupler Josephson junction 11K, a conductive path containing the first resonator Josephson junction 11J, and a conductive path containing the second resonator Josephson junction 12J. For example, by controlling the magnetic flux Φ within the ring 10LP, the coupling strength between the first qubit 51B and the second qubit 52B can be controlled. The magnetic flux Φ within the ring 10LP can be controlled by the magnetic flux control unit 60 described later.

[0114] For example, the coupling between the first qubit 51B and the second qubit 52B can be substantially cut off. This state is, for example, an idling state. In the idling state, the first resonator 11R can be considered as a resonator strongly coupled to the first qubit 51B. The first resonator 11R can function as a readout resonator. In this implementation, a separately formed readout resonator is not required. This results in a space-saving electronic circuit.

[0115] For example, transducers are used instead of linear resonators as the first filter resonator 41f and the second filter resonator 42f. In this case, the transducer input is sufficiently attenuated. Strong coupling between the first resonator 11R and the first qubit 51B results in a large state-dependent frequency shift. For example, through strong coupling, the state-dependent frequency shift is approximately 30 MHz, enabling readout of the qubit's state.

[0116] For example, with approximately 50% loss in the output signal, a readout error probability of less than 1% can be obtained during a 200ns readout period.

[0117] Figure 3 This is a schematic diagram illustrating the characteristics of the electronic circuit according to the first embodiment.

[0118] Figure 3 The pass characteristics of the first filter 31F are illustrated. Figure 3 The horizontal axis represents the frequency fr1. The vertical axis represents the throughput Tr. As already explained, the first filter 31F may include a first filter resonator 41f and a second filter resonator 42f. Figure 3 The following example illustrates the pass characteristics of the first filter resonator 41f and the second filter resonator 42f. (See example...) Figure 3As shown, the first filter 31F includes a passband 50p, a first non-passband 50r, and a second non-passband 50s. The frequency fr1 of the passband 50p is higher than the frequency fr1 of the first non-passband 50r. The frequency fr1 of the passband 50p is lower than the frequency fr1 of the second non-passband 50s. The non-passbands (e.g., the first non-passband 50r) correspond to the reflection band of the first filter 31F. The passbands of the first filter resonator 41f and the second filter resonator 42f are contained within the passband 50p.

[0119] exist Figure 3 The resonant frequency f10A of the first coupler 10A is illustrated. The resonant frequency f10A of the first coupler 10A includes the resonant frequencies of the first resonator 11R and the second resonator 12R. The passband 50p of the first filter 31F includes the resonant frequencies of the first resonator 11R and the second resonator 12R.

[0120] exist Figure 3 The frequency f50 of the qubit is illustrated. The frequency f50 of the qubit includes the resonant frequency of the first qubit 51B and the resonant frequency of the second qubit 52B. The reflection band of the first filter 31F includes the frequency f50 of the qubit (the resonant frequency of the first qubit 51B and the resonant frequency of the second qubit 52B).

[0121] In this embodiment, the first filter 31F allows the resonant frequency of the first resonator 11R in its unloaded state to pass through. The first filter 31F substantially does not allow the resonant frequency of the first qubit 51B to pass through. This first filter 31F is coupled to the first readout conductor 21. The first readout conductor 21 functions as a readout line. In this embodiment, high-speed readout is possible. In this embodiment, good qubit coherence time (high gate fidelity) can be obtained.

[0122] In an implementation, for example, the passband of the first filter 31F includes the resonant frequency of the first resonator 11R when the first coupling strength is substantially zero.

[0123] In one example, the absolute value of the difference between the resonant frequency of the first resonator 11R and the resonant frequency of the first qubit 51B can be greater than the absolute value of the difference between the resonant frequency of the first resonator 11R and the resonant frequency of the second resonator 12R. Similarly, the absolute value of the difference between the resonant frequency of the second resonator 12R and the resonant frequency of the second qubit 52B can be greater than the absolute value of the difference between the resonant frequency of the first resonator 11R and the resonant frequency of the second resonator 12R.

[0124] In one example, the absolute value of the difference between the resonant frequency of the first qubit 51B and the resonant frequency of the second qubit 52B can be smaller than the absolute value of the difference between the resonant frequency of the first resonator 11R and the resonant frequency of the first qubit 51B. The absolute value of the difference between the resonant frequency of the first qubit 51B and the resonant frequency of the second qubit 52B can be smaller than the absolute value of the difference between the resonant frequency of the second resonator 12R and the resonant frequency of the second qubit 52B.

[0125] Figure 4 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0126] like Figure 4 As shown, the electronic circuit 111 involved in the embodiment includes a first qubit 51B, a second qubit 52B, a first coupler 10A, a first readout conductive component 21, and a first filter 31F. The structure of the first filter 31F in electronic circuit 111 is different from the structure of the first filter 31F in electronic circuit 110. Other than this, the structure in electronic circuit 111 can be the same as the structure of electronic circuit 110.

[0127] In electronic circuit 111, the first filter 31F includes a first conductive component 41, a second conductive component 42, and at least one third conductive component 43. The third conductive component 43 is disposed between the first conductive component 41 and the second conductive component 42. Multiple third conductive components 43 may be provided. In this example, three third conductive components 43 are disposed between the first conductive component 41 and the second conductive component 42. The third conductive component 43 is capable of coupling with both the first conductive component 41 and the second conductive component 42.

[0128] The first conductive component 41 includes a first conductive portion 41p and a first other conductive portion 41q. The first conductive portion 41p is capable of coupling with the first resonator 11R. The second conductive component 42 is capable of coupling with the second resonator 12R. The first other conductive portion 41q is capable of coupling with the first readout conductive component 21. The second conductive component 42 includes a second conductive portion 42p and a second other conductive portion 42q. The second conductive portion 42p is capable of coupling with the second resonator 12R.

[0129] The first conductive portion 41p corresponds to the first filter portion 31P. The second conductive component 42 (the second conductive portion 42p) corresponds to the first other filter portion 31Q. The first other conductive portion 41q corresponds to the first readout portion 31R.

[0130] In the first filter 31F of electronic circuit 111, the steepness of the change in transmittance Tr between the passband 50p and the non-passband can be improved. For example, the readout speed is improved. For example, performance is improved with respect to the coherence time of the qubit (high gate fidelity).

[0131] For example, filter 31F allows the resonant frequencies of the first resonator 11R and the second resonator 12R in the unloaded state to pass. Filter 31F essentially does not allow the frequencies of the qubits to pass over a wide bandwidth. A steep bandpass filter can be obtained.

[0132] Figure 5 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0133] like Figure 5 As shown, the electronic circuit 112 involved in the embodiment includes a first qubit 51B, a second qubit 52B, a first coupler 10A, a first readout conductive member 21, and a first filter 31F. The structure of the first filter 31F in electronic circuit 112 is different from the structure of the first filter 31F in electronic circuit 110. Other than this, the structure in electronic circuit 112 can be the same as the structure of electronic circuit 110.

[0134] In electronic circuit 112, the first filter 31F includes a first conductive component 41, a second conductive component 42, and a third conductive component 43. The first conductive component 41 is coupled to a first resonator 11R. The second conductive component 42 is coupled to a second resonator 12R. The third conductive component 43 is coupled to a first readout conductive component 21. At least a portion of the third conductive component 43 is disposed between the first conductive component 41 and the second conductive component 42.

[0135] For example, the first filter 31F includes a first conductive component Josephson junction 41J, a second conductive component Josephson junction 42J, and a third conductive component Josephson junction 43J. The first conductive component Josephson junction 41J can be coupled to the first conductive component 41. The second conductive component Josephson junction 42J can be coupled to the second conductive component 42. The third conductive component Josephson junction 43J can be coupled to the third conductive component 43.

[0136] The first filter 31F is, for example, based on a transect resonator. In an embodiment, the first coupler 10A is a dual transect coupler. The transect of the first coupler 10A functions as a readout resonator. By applying the first filter 31F based on the transect resonator, space saving can be further achieved.

[0137] Figure 6 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0138] like Figure 6As shown, in the electronic circuit 113 according to the embodiment, the structures of the first conductive member 41 and the second conductive member 42 included in the first filter 31F are different from those in the electronic circuit 110. The other structures in the electronic circuit 113 may be the same as those in the electronic circuit 110.

[0139] In electronic circuit 113, the first conductive component 41 includes a plurality of first filter conductive parts (conductive parts 41a to 41c, etc.). The second conductive component 42 includes a plurality of second filter conductive parts (conductive parts 42a to 42c, etc.). The plurality of first filter conductive parts (conductive parts 41a to 41c) can be coupled to each other. The plurality of second filter conductive parts (conductive parts 42a to 42c, etc.) can be coupled to each other.

[0140] For example, a first conductive portion 41p is provided in one of the plurality of first filter conductive portions. For example, a first other conductive portion 41q is provided in another of the plurality of first filter conductive portions. A second conductive portion 42p is provided in one of the plurality of second filter conductive portions. A second other conductive portion 42q is provided in another of the plurality of second filter conductive portions.

[0141] Figure 7 (a)~ Figure 7 (e) and Figure 8 (a)~ Figure 8 (c) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0142] like Figure 7 As shown in (a), in the first Josephson junction 51J, conductive films 85a and 85b are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86a is disposed between a portion of conductive film 85a and a portion of conductive film 85b.

[0143] like Figure 7 As shown in (b), in the second Josephson junction 52J, conductive films 85c and 85d are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86b is disposed between a portion of conductive film 85c and a portion of conductive film 85d.

[0144] like Figure 7 As shown in (c), in the first resonator Josephson junction 11J, conductive films 85e and 85f are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86c is disposed between a portion of conductive film 85e and a portion of conductive film 85f.

[0145] like Figure 7As shown in (d), in the second resonator Josephson junction 12J, conductive films 85g and 85h are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86d is disposed between a portion of conductive film 85g and a portion of conductive film 85h.

[0146] like Figure 7 As shown in (e), in the first coupler Josephson junction 11K, conductive films 85i and 85j are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86e is disposed between a portion of conductive film 85i and a portion of conductive film 85j.

[0147] like Figure 8 As shown in (a), in the first conductive component Josephson junction 41J, conductive films 85k and 85l face each other on the first surface 81F of the first substrate 81. An insulating film 86f is disposed between a portion of conductive film 85k and a portion of conductive film 85l.

[0148] like Figure 8 As shown in (b), in the second conductive component Josephson junction 42J, conductive films 85m and 85n are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86g is disposed between a portion of conductive film 85m and a portion of conductive film 85n.

[0149] like Figure 8 As shown in (c), in the third conductive component Josephson junction 43J, conductive films 85o and 85p are opposite each other on the first surface 81F of the first substrate 81. An insulating film 86h is provided between a portion of conductive film 85o and a portion of conductive film 85p.

[0150] Figure 9 (a) and Figure 9 (b) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0151] like Figure 9 As shown in (a), the first resonator conductive portion 11a may be disposed on the first surface 81F of a substrate (e.g., the first substrate 81). The first conductive member 41 may be disposed on the second surface 82F of another substrate (e.g., the second substrate 82). The second surface 82F faces the first surface 81F.

[0152] like Figure 9 As shown in (b), the second resonator conductive portion 12a may be disposed on the first surface 81F of a substrate (e.g., the first substrate 81). The second conductive member 42 may be disposed on the second surface 82F of another substrate (e.g., the second substrate 82).

[0153] Figure 10 (a) and Figure 10 (b) is a schematic cross-sectional view illustrating a portion of the electronic circuit according to the first embodiment.

[0154] like Figure 10 As shown in (a), the first conductive member 41 can be disposed on one substrate. The first readout conductive member 21 can be disposed on another substrate. The aforementioned one substrate can be, for example, one of the first substrate 81 and the second substrate 82. The aforementioned other substrate can be, for example, the other of the first substrate 81 and the second substrate 82.

[0155] like Figure 10 As shown in (b), the second conductive component 42 can be disposed on one substrate. The first readout conductive component 21 can be disposed on another substrate. The aforementioned substrate can be, for example, one of the first substrate 81 and the second substrate 82. The aforementioned other substrate can be, for example, the other of the first substrate 81 and the second substrate 82.

[0156] Alternatively, the first resonator conductive portion 11a may be disposed on a first surface 81F of a substrate (e.g., the first substrate 81), and the first conductive member 41 may be disposed on the other surface (e.g., the back surface) of the substrate (e.g., the first substrate 81). Or, the second resonator conductive portion 12a may be disposed on a first surface 81F of a substrate (e.g., the first substrate 81), and the second conductive member 42 may be disposed on the other surface (e.g., the back surface) of the substrate (e.g., the first substrate 81).

[0157] Alternatively, the first conductive component 41 may be disposed on one side of a substrate, and the first readout conductive component 21 may be disposed on the other side (e.g., the back side) of the substrate. Or, the second conductive component 42 may be disposed on one side of a substrate, and the first readout conductive component 21 may be disposed on the other side (e.g., the back side) of the substrate.

[0158] Figure 11 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0159] like Figure 11 As shown, in the electronic circuit 114 of the embodiment, the first coupler 10A can be coupled to a plurality of first readout conductive components 21 via the first filter 31F.

[0160] In electronic circuit 114, the first filter 31F includes a plurality of first conductive components 41 and a plurality of second conductive components 42. The plurality of first conductive components 41 are capable of mutual coupling. The plurality of second conductive components 42 are capable of mutual coupling. A portion of one of the plurality of first conductive components 41 corresponds to a first conductive portion 41p. A portion of another of the plurality of first conductive components 41 corresponds to a first other conductive portion 41q. A portion of one of the plurality of second conductive components 42 corresponds to a second conductive portion 42p. A portion of another of the plurality of second conductive components 42 corresponds to a second other conductive portion 42q.

[0161] A portion (e.g., an end) of each of the plurality of first conductive members 41 and a portion (e.g., an end) of each of the plurality of second conductive members 42 are connected to the ground conductive layer 85G. In this example, a portion of each of the plurality of first conductive members 41 and a portion of each of the plurality of second conductive members 42 are connected to the conductive layer 85 (ground conductive layer 85G) disposed around these conductive members. A portion of each of the plurality of first conductive members 41 and a portion of each of the plurality of second conductive members 42 can also be connected to the conductive layer 88 disposed on the back side of the first substrate 81 (see reference) through a through connection provided in the first substrate 81. Figure 13 Electrical connection. Conductive layer 88 functions as ground conductive layer 85G.

[0162] Thus, the first filter 31F may include multiple conductive components. When the multiple conductive components include a first conductive component 41 and a second conductive component 42, the number of conductive components n is 2. When the multiple conductive components include a first conductive component 41, a second conductive component 42, and a third conductive component 43, the number of conductive components n is 3. In the electronic circuit 114, the number of conductive components n is 4.

[0163] Figure 12 This is a schematic top view illustrating the electronic circuit according to the first embodiment.

[0164] like Figure 12As shown, in the electronic circuit 115 according to the embodiment, the first coupler 10A can be coupled to a plurality of first readout conductive members 21 via a first filter 31F. The first filter 31F includes a first conductive member 41, a second conductive member 42, and a third conductive member 43. A portion of the first conductive member 41 and a portion of the third conductive member 43 face each other. The first conductive member 41 can be coupled to a portion of the third conductive member 43. The second conductive member 42 corresponds to another portion of the third conductive member 43. The second conductive member 42 can be coupled to another portion of the third conductive member 43. Electronic circuits that can improve performance can also be provided in electronic circuits 114 and 115.

[0165] In electronic circuit 115, a portion (e.g., an end) of each of the first conductive member 41, the second conductive member 42, and the third conductive member 43 is connected to the ground conductive layer 85G. In this example, a portion of each of the first conductive member 41, the second conductive member 42, and the third conductive member 43 is connected to the conductive layer 85 (ground conductive layer 85G) disposed around these conductive members. A portion of each of the first conductive member 41, the second conductive member 42, and the third conductive member 43 can also be connected to the conductive layer 88 disposed on the back side of the first substrate 81 (see reference 88) via a through connection. Figure 13 Electrical connection. Conductive layer 88 functions as ground conductive layer 85G.

[0166] The following examples illustrate simulation results of the characteristics of electronic circuits 114 and 115.

[0167] Figure 13 This is a schematic cross-sectional view illustrating the electronic circuit according to the first embodiment.

[0168] Figure 13 An example simulation model is shown. For example... Figure 13 As shown, a conductive layer 85 and a conductive layer 87 are disposed on the first surface 81F of the first substrate 81. The conductive layer 87 corresponds to the first conductive member 41, the second conductive member 42, or the third conductive member 43. A conductive layer 88 is disposed on the back side of the first substrate 81. In the simulation, the first substrate 81 has the dielectric constant of silicon. The thickness of the first substrate 81 is 300 μm. The width w1 (length in the direction intersecting the extension direction) of the conductive layer 87 is 20 μm. The distances w2 and w3 between the conductive layer 85 and the conductive layer 87 are 10 μm. In the simulation, for simplicity, the thicknesses of the conductive layers 85, 87, and 88 are set to 0.

[0169] Figure 14 This is a graph illustrating the characteristics of the electronic circuit according to the first embodiment.

[0170] Figure 14The pass characteristics of the first filter 31 in the pattern of electronic circuit 114 are illustrated. Figure 14 The horizontal axis represents frequency. The vertical axis represents insertion loss S21. Figure 14 Examples are shown where the number n of the multiple conductive components included in the first filter 31F is 2, 3, and 4.

[0171] like Figure 14 As shown, good throughput characteristics can be obtained in electronic circuit 114. When the number of multiple conductive components n increases, low insertion loss S21 can be obtained.

[0172] Figure 15 This is a graph illustrating the characteristics of the electronic circuit according to the first embodiment.

[0173] Figure 15 The pass characteristics of the first filter 31 in the mode of electronic circuit 115 are illustrated. Figure 15 The text shows that in Figure 14 The characteristics of the illustrated electronic circuit 114 when the number n of the multiple conductive components is 3. Figure 15 The horizontal axis represents frequency. The vertical axis represents insertion loss S21. For example... Figure 15 As shown, a frequency band with significantly low insertion loss S2 can be obtained in electronic circuit 115. This frequency band corresponds to the resonant frequency of the qubit. Better cutoff and throughput characteristics can be obtained in electronic circuit 115, enabling stable readout operation.

[0174] Figure 16 This is a schematic diagram illustrating the electronic circuit according to the first embodiment.

[0175] like Figure 16 As shown, the electronic circuit 120 involved in the embodiment includes a first qubit 51B, a second qubit 52B, a first coupler 10A, a first readout conductive member 21, and a first filter 31F. The electronic circuit 120 also includes a third qubit 53B, a second coupler 10B, a second filter 32F, and a second readout conductive member 22. Apart from these, the structure of the electronic circuit 120 can be the same as that of the electronic circuit 110.

[0176] The second coupler 10B includes a third resonator 13R capable of coupling to the second qubit 52B and a fourth resonator 14R capable of coupling to the third qubit 53B. The second filter 32F includes a second filter section 32P, a second additional filter section 32Q, and a second readout section 32R. The second filter section 32P is capable of coupling to the third resonator 13R. The second additional filter section 32Q is capable of coupling to the fourth resonator 14R. The second readout section 32R is capable of coupling to the second readout conductive member 22. For example, the readout circuit 70R can be electrically connected to the second readout conductive member 22.

[0177] In electronic circuit 120, the state of the second qubit 52B can be read out via the second coupler 10B and the second filter 32F. The state of the third qubit 53B can also be read out via the second coupler 10B and the second filter 32F. This achieves space saving.

[0178] The structure of the first filter 31F, as described with respect to electronic circuits 111 and 112, can be applied to the second filter 32F.

[0179] Figure 17 This is a schematic diagram illustrating the electronic circuit according to the first embodiment.

[0180] like Figure 17 As shown, the electronic circuit 121 involved in the embodiment also includes a fourth qubit 54B, a third coupler 10C, a third filter 33F, and a third readout conductive component 23. Apart from these, the structure of the electronic circuit 121 can be the same as that of the electronic circuit 120.

[0181] The third coupler 10C includes a fifth resonator 15R capable of coupling to the second qubit 52B and a sixth resonator 16R capable of coupling to the fourth qubit 54B. The third filter 33F includes a third filter section 33P, a third additional filter section 33Q, and a third readout section 33R. The third filter section 33P is capable of coupling to the fifth resonator 15R. The third additional filter section 33Q is capable of coupling to the sixth resonator 16R. The third readout section 33R is capable of coupling to the third readout conductive member 23. For example, the readout circuit 70R can be electrically connected to the third readout conductive member 23.

[0182] In electronic circuit 121, the state of the second qubit 52B can be read out via the third coupler 10C and the third filter 33F. The state of the fourth qubit 54B can also be read out via the third coupler 10C and the third filter 33F. This achieves space saving.

[0183] In electronic circuits 120 and 121, "Q" corresponds to a qubit. "T" corresponds to a transonic. "F" corresponds to a filter (e.g., a Purcell filter).

[0184] In electronic circuit 121, the state of the second qubit 52B can be read out through a first set of circuits, a second set of circuits, and a third set of circuits. The first set of circuits includes a first coupler 10A and a first filter 31F. The second set of circuits includes a second coupler 10B and a second filter 32F. The third set of circuits includes a third coupler 10C and a third filter 33F. Through the readout operation via the three sets of circuits, the state of the qubit can be determined according to the "majority rule".

[0185] like Figure 17 As shown, for example, a signal processing unit 70P may be provided. The signal processing unit 70P may be included in the electronic circuit 121. The signal processing unit 70P may be provided separately from the electronic circuit 121.

[0186] The signal processing unit 70P is capable of acquiring a first readout signal Sr1, a second readout signal Sr2, and a third readout signal Sr3. The first readout signal Sr1 is acquired from the first readout conductive member 21. The second readout signal Sr2 is acquired from the second readout conductive member 22. The third readout signal Sr3 is acquired from the third readout conductive member 23.

[0187] The signal processing unit 70P can compare a first readout value V1 related to a first readout signal Sr1, a second readout value V2 related to a second readout signal Sr2, and a third readout value V3 related to a third readout signal Sr3. The signal processing unit 70P can output a value Sig2, which is the smallest difference between the first readout value V1, the second readout value V2, and the third readout value V3 and the other readout values. For example, a more accurate determination can be made through a majority decision principle.

[0188] (Second Implementation)

[0189] Figure 18 This is a schematic diagram illustrating the electronic circuit and computing device involved in the second embodiment.

[0190] like Figure 18 As shown, the electronic circuit 130 according to the embodiment includes a flux control unit 60. In addition, the structure of the electronic circuit 130 can have any of the electronic circuit structures described in the first embodiment.

[0191] The flux control unit 60 is capable of controlling the flux Φ of the space within the ring 10LP. As already explained, the ring 10LP includes a conductive path containing the first coupler Josephson junction 11K, a conductive path containing the first resonator Josephson junction 11J, and a conductive path containing the second resonator Josephson junction 12J.

[0192] In this example, the flux control unit 60 includes a first control conductive unit 61. For example, a control unit 70 may be provided. The control unit 70 controls the flux Φ within the ring 10LP, for example, by controlling the flux control unit 60. The control unit 70 provides a flux control signal Sc to the first control conductive unit 61, for example. Thus, the control unit 70 controls the flux Φ within the ring 10LP. The computing device 210 according to the embodiment includes an electronic circuit 130 and a control unit 70.

[0193] The control unit 70 is capable of performing at least the first operation and the second operation. In the first operation, the control unit 70 is capable of varying the magnetic flux Φ within the ring 10LP between a first value and a second value. The second value is different from the first value. By varying the magnetic flux Φ, the control unit 70 performs a two-qubit operation on the first qubit 51B and the second qubit 52B. In the second operation, the control unit 70 performs a two-qubit operation on the first qubit 51B and the second qubit 52B by modulating the magnetic flux Φ in an alternating manner.

[0194] The electronic circuit 130 may also include a first qubit control unit 65A and a second qubit control unit 65B. The control unit 70 is capable of providing a first qubit control signal Sb1 to the first qubit control unit 65A. The control unit 70 is capable of providing a second qubit control signal Sb2 to the second qubit control unit 65B. By controlling these signals, the state of the qubits can be controlled.

[0195] Implementation methods may include the following configurations (e.g., technical solutions).

[0196] (Component 1)

[0197] An electronic circuit, comprising:

[0198] The first quantum bit;

[0199] The second quantum bit;

[0200] A first coupler includes a first resonator and a second resonator, the first resonator being capable of coupling with the first qubit and the second resonator being capable of coupling with the second qubit;

[0201] The first readout conductive component; and

[0202] The first filter includes a first filter section, a first other filter section, and a first readout section. The first filter section is coupled to the first resonator, the first other filter section is coupled to the second resonator, and the first readout section is coupled to the first readout conductive component.

[0203] (Component 2)

[0204] According to the electronic circuit described in configuration 1

[0205] The first filter includes:

[0206] The first conductive component includes a first conductive portion and a first other conductive portion; and

[0207] The second conductive component includes a second conductive portion and second other conductive portions.

[0208] The first conductive portion can be coupled to the first resonator.

[0209] The second conductive portion can be coupled to the second resonator.

[0210] The first other conductive portion can be coupled to the first readout conductive component.

[0211] The second other conductive portion can be coupled to the first readout conductive component.

[0212] (Component 3)

[0213] According to the electronic circuit described in configuration 1

[0214] The first filter includes:

[0215] The first conductive component includes a first conductive portion and a first other conductive portion;

[0216] The second conductive component; and

[0217] At least one third conductive component is disposed between the first conductive component and the second conductive component.

[0218] The third conductive component can be coupled to the first conductive component and the second conductive component.

[0219] The first conductive portion can be coupled to the first resonator.

[0220] The second conductive component can be coupled to the second resonator.

[0221] The first other conductive portion can be coupled to the first readout conductive component.

[0222] (Component 4)

[0223] According to the electronic circuit described in configuration 1

[0224] The first filter includes:

[0225] A first conductive component, which is capable of coupling with the first resonator;

[0226] A second conductive component, which is capable of coupling with the second resonator; and

[0227] A third conductive component is coupled to the first readout conductive component, and at least a portion of the third conductive component is disposed between the first conductive component and the second conductive component.

[0228] (Component 5)

[0229] According to the electronic circuit described in configuration 4

[0230] The first filter also includes:

[0231] The first conductive component is a Josephson junction, which is capable of coupling with the first conductive component;

[0232] The second conductive component is a Josephson junction, which is capable of coupling with the second conductive component; and

[0233] The third conductive component is a Josephson junction, which is capable of coupling with the third conductive component.

[0234] (Composition 6)

[0235] According to the electronic circuit described in any one of 1 to 5,

[0236] The resonant frequency of the first resonator is higher than the resonant frequency of the first qubit.

[0237] The resonant frequency of the second resonator is higher than the resonant frequency of the second qubit.

[0238] The absolute value of the difference between the resonant frequency of the first resonator and the resonant frequency of the first qubit is greater than the absolute value of the difference between the resonant frequency of the first resonator and the resonant frequency of the second resonator.

[0239] The absolute value of the difference between the resonant frequency of the second resonator and the resonant frequency of the second qubit is greater than the absolute value of the difference between the resonant frequency of the first resonator and the resonant frequency of the second resonator.

[0240] (Component 7)

[0241] According to the electronic circuit described in configuration 6

[0242] The absolute value of the difference between the resonant frequency of the first qubit and the resonant frequency of the second qubit is smaller than the absolute value of the difference between the resonant frequency of the first resonator and the resonant frequency of the first qubit, and smaller than the absolute value of the difference between the resonant frequency of the second resonator and the resonant frequency of the second qubit.

[0243] (Composition 8)

[0244] According to the electronic circuit described in any one of 1 to 5,

[0245] The first resonator includes a first inductor and a first capacitor connected in parallel with the first inductor.

[0246] The second resonator includes a second inductor and a second capacitor connected in parallel with the second inductor.

[0247] The first coupler also includes a first coupler Josephson junction.

[0248] One end of the Josephson junction of the first coupler is connected to one end of the first inductor and one end of the first capacitor.

[0249] The other end of the Josephson junction of the first coupler is connected to one end of the second inductor and one end of the second capacitor.

[0250] (Composition 9)

[0251] According to the electronic circuit described in configuration 8

[0252] The first inductor includes at least one first resonator Josephson junction.

[0253] The second inductor includes at least one second resonator, a Josephson junction.

[0254] (Composition 10)

[0255] According to the electronic circuit described in configuration 9

[0256] By controlling the magnetic flux within the loop that includes the conductive path containing the first coupler Josephson junction, the conductive path containing the first resonator Josephson junction, and the conductive path containing the second resonator Josephson junction, the coupling strength between the first qubit and the second qubit can be controlled.

[0257] (Composition 11)

[0258] According to the electronic circuit described in configuration 10

[0259] The passband of the first filter includes the resonant frequency of the first resonator when the first coupling strength is substantially zero and the resonant frequency of the second resonator when the second coupling strength is substantially zero.

[0260] (Composition 12)

[0261] According to the electronic circuit described in configuration 11

[0262] The reflection band of the first filter includes the resonant frequency of the first qubit and the resonant frequency of the second qubit.

[0263] (Composition 13)

[0264] According to the electronic circuit described in configuration 12

[0265] It also includes a readout circuit electrically connected to the first readout conductive component.

[0266] The readout circuit can detect the state of the first qubit and the state of the second qubit by detecting the output signal based on the input signal input to the first readout conductive component.

[0267] (Composition 14)

[0268] The electronic circuit according to any one of 1 to 12 further comprises:

[0269] The third quantum bit;

[0270] Second coupler;

[0271] The second filter; and

[0272] The second readout conductive component,

[0273] The second coupler includes:

[0274] A third resonator, which can be coupled to the second qubit; and

[0275] The fourth resonator is capable of coupling with the third qubit.

[0276] The second filter includes a second filter section, a second other filter section, and a second readout section.

[0277] The second filter section can be coupled to the third resonator.

[0278] The second other filter section can be coupled to the fourth resonator.

[0279] The second readout portion can be coupled to the second readout conductive component.

[0280] (Composition 15)

[0281] The electronic circuit according to configuration 14 further comprises:

[0282] The 4th quantum bit;

[0283] Third coupler;

[0284] The third filter; and

[0285] The third readout conductive component.

[0286] The third coupler includes:

[0287] The fifth resonator, which is capable of coupling with the second qubit; and

[0288] The sixth resonator is capable of coupling with the fourth qubit.

[0289] The third filter includes a third filter section, a third other filter section, and a third readout section.

[0290] The third filter section can be coupled to the fifth resonator.

[0291] The third other filter section can be coupled to the sixth resonator.

[0292] The third readout portion can be coupled to the third readout conductive component.

[0293] (Composition 16)

[0294] According to the electronic circuit described in configuration 15

[0295] It also has a signal processing unit.

[0296] The signal processing unit is capable of acquiring a first readout signal obtained from the first readout conductive component, a second readout signal obtained from the second readout conductive component, and a third readout signal obtained from the third readout conductive component.

[0297] The signal processing unit can compare a first readout value related to a first readout signal, a second readout value related to a second readout signal, and a third readout value related to a third readout signal, and output the value among the first readout value, the second readout value, and the third readout value that has the smallest difference from the other readout values.

[0298] (Composition 17)

[0299] According to the electronic circuit described in configuration 10 or 11

[0300] It also includes a flux control unit capable of controlling the magnetic flux in the space within the ring.

[0301] (Composition 18)

[0302] A computing device comprising:

[0303] The electronic circuit described in 17; and

[0304] Control Department

[0305] The flux control unit includes a first control conductivity unit.

[0306] The control unit is capable of providing magnetic flux control signals to the first control conductive unit.

[0307] (Composition 19)

[0308] According to the computing device described in configuration 18

[0309] The control unit is capable of performing at least the first action and the second action.

[0310] In the first operation, the control unit performs two-qubit operations on the first and second qubits by varying the magnetic flux between a first value and a second value different from the first value.

[0311] In the second operation, the control unit performs the two-qubit operation of the first qubit and the second qubit by modulating the magnetic flux in an alternating manner.

[0312] According to the implementation method, it is possible to provide electronic circuits and computing devices that can improve performance.

[0313] The embodiments of the present invention have been described above with reference to examples. However, the present invention is not limited to these examples. For example, any specific structure of elements such as nonlinear components, Josephson junctions, capacitors, and conductive parts included in an electronic circuit or computing device, as long as it can be appropriately selected by those skilled in the art from the well-known range to be implemented in the same way as the present invention and to obtain the same effect, is included within the scope of the present invention.

[0314] Any technical solution obtained by combining any two or more elements of the various examples within the scope of technical feasibility, as long as it contains the spirit of the present invention, is also included within the scope of the present invention.

[0315] All electronic circuits and computing devices that can be implemented by suitable design modifications based on the electronic circuits and computing devices described above as embodiments of the present invention, provided that they contain the spirit of the present invention, are also within the scope of the present invention.

[0316] Those skilled in the art can conceive of various modifications and alterations within the scope of the present invention, and such modifications and alterations should also be considered to fall within the scope of the present invention.

[0317] Several embodiments of the present invention have been described above, but these embodiments are merely illustrative and not intended to limit the scope of the invention. These new embodiments can be implemented in a wide variety of other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and / or variations thereof are included within the scope and spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

Claims

1. An electronic circuit, comprising: The first quantum bit; The second quantum bit; A first coupler includes a first resonator and a second resonator, the first resonator being capable of coupling with the first qubit and the second resonator being capable of coupling with the second qubit; The first readout conductive component; and The first filter includes a first filter section, first other filter sections, and a first readout section. The first filter section is coupled to the first resonator, the first other filter sections are coupled to the second resonator, and the first readout section is coupled to the first readout conductive component. The first coupler also includes a first coupler Josephson junction. One end of the Josephson junction of the first coupler is connected to the first resonator. The other end of the Josephson junction of the first coupler is connected to the second resonator.

2. The electronic circuit according to claim 1, The first filter includes: The first conductive component includes a first conductive portion and a first other conductive portion; and The second conductive component includes a second conductive portion and second other conductive portions. The first conductive portion can be coupled to the first resonator. The second conductive portion can be coupled to the second resonator. The first other conductive portion can be coupled to the first readout conductive component. The second other conductive portion can be coupled to the first readout conductive component.

3. The electronic circuit according to claim 1, The first filter includes: The first conductive component includes a first conductive portion and a first other conductive portion; Second conductive component; as well as At least one third conductive component is disposed between the first conductive component and the second conductive component. The third conductive component can be coupled to the first conductive component and the second conductive component. The first conductive portion can be coupled to the first resonator. The second conductive component can be coupled to the second resonator. The first other conductive portion can be coupled to the first readout conductive component.

4. The electronic circuit according to claim 1, The first filter includes: A first conductive component, which is capable of coupling with the first resonator; A second conductive component, which is capable of coupling with the second resonator; as well as A third conductive component is coupled to the first readout conductive component, and at least a portion of the third conductive component is disposed between the first conductive component and the second conductive component.

5. The electronic circuit according to claim 4, The first filter also includes: The first conductive component is a Josephson junction, which is capable of coupling with the first conductive component; The second conductive component is a Josephson junction, which is capable of coupling with the second conductive component; and The third conductive component is a Josephson junction, which is capable of coupling with the third conductive component.

6. The electronic circuit according to claim 1, The first resonator includes a first inductor and a first capacitor connected in parallel with the first inductor. The second resonator includes a second inductor and a second capacitor connected in parallel with the second inductor. One end of the Josephson junction of the first coupler is connected to one end of the first inductor and one end of the first capacitor. The other end of the Josephson junction of the first coupler is connected to one end of the second inductor and one end of the second capacitor. The first inductor includes at least one first resonator Josephson junction. The second inductor includes at least one second resonator, a Josephson junction.

7. The electronic circuit according to claim 6, By controlling the magnetic flux within the loop that includes the conductive path containing the first coupler Josephson junction, the conductive path containing the first resonator Josephson junction, and the conductive path containing the second resonator Josephson junction, the coupling strength between the first qubit and the second qubit can be controlled.

8. The electronic circuit according to claim 1 further comprises: The third quantum bit; Second coupler; The second filter; and The second readout conductive component, The second coupler includes: The third resonator is capable of coupling with the second qubit; and The fourth resonator is capable of coupling with the third qubit. The second filter includes a second filter section, a second other filter section, and a second readout section. The second filter section can be coupled to the third resonator. The second other filter section can be coupled to the fourth resonator. The second readout section can be coupled to the second readout conductive component. The electronic circuit further comprises: The 4th quantum bit; Third coupler; The third filter; and The third readout conductive component. The third coupler includes: The fifth resonator is capable of coupling with the second qubit; and The sixth resonator is capable of coupling with the fourth qubit. The third filter includes a third filter section, a third other filter section, and a third readout section. The third filter section can be coupled to the fifth resonator. The third other filter section can be coupled to the sixth resonator. The third readout portion can be coupled to the third readout conductive component.

9. The electronic circuit according to claim 7, It also includes a flux control unit capable of controlling the magnetic flux in the space within the ring.

10. A computing device comprising: The electronic circuit according to claim 9; and Control Department The flux control unit includes a first control conductivity unit. The control unit is capable of providing magnetic flux control signals to the first control conductive unit.

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