Superconducting parameter amplifier, quantum computing amplification module and reading circuit

Abstract

The invention discloses a superconducting parameter amplifier, a quantum calculation amplification module and a readout circuit, and the amplifier comprises an input end which is used for receiving a quantum signal transmitted by a quantum chip; the filter circuit receives the quantum signal sent by the input end and filters the quantum signal to obtain a first signal; the amplifying circuit is used for receiving the first signal sent by the filter circuit and the input control signal, and amplifying the first signal to obtain a second signal; the amplification circuit sends the second signal to the filter circuit, and filters again to generate a third signal; the output end outputs a third signal; a filter circuit is integrated on the superconducting parameter amplifier, so that a quantum signal is filtered by the filter circuit and then sent to an amplifying circuit, superconducting parameters are amplified to obtain a second signal, and the second signal is output by the filter circuit again, and on the basis of keeping the function of a quantum circuit, the number of components in a temperature zone is reduced, and the space and cooling capacity pressure of the temperature zone is relieved; and more quantum bits can be expanded conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of quantum computing, and in particular to a superconducting parametric amplifier, a quantum computing amplification module and a readout circuit. BACKGROUND

[0002] The signal readout circuit of the quantum computer is used to read out the signal sent by the quantum chip, and the signal is filtered and processed and parametrically amplified by a low-pass filter, a circulator and a superconducting parametric amplifier. The existing superconducting parametric amplifier includes a Klopfenstein type tapered transformer and a 1 / 4 and 1 / 2 wavelength impedance transformer, which receives the signal filtered by the low-pass filter, needs to be impedance matched, expands the amplifier bandwidth, and is used for subsequent parametric amplification; the above components are arranged in the 20mK temperature zone of the quantum computer, and are connected with the quantum chip through the circulator and the low-pass filter, and the large number of components cause the space in the temperature zone to be crowded, which affects the expansion of the number of quantum bits. SUMMARY

[0003] The purpose of the present application is to solve the problem of the existing technology that there are many components in the temperature zone, which affects the expansion of the number of quantum bits, and proposes a superconducting parametric amplifier, a quantum computing amplification module and a readout circuit.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a superconducting parametric amplifier, comprising: an input end for receiving a quantum signal sent by a quantum chip;

[0005] a filter circuit for filtering the quantum signal sent by the input end to obtain a first signal;

[0006] an amplification circuit for receiving the first signal sent by the filter circuit and an input control signal, and amplifying the first signal to obtain a second signal;

[0007] The amplification circuit sends the second signal to the filter circuit again, and generates a third signal by filtering;

[0008] an output end for outputting the third signal.

[0009] As a further description of the above technical scheme: the filter circuit includes a plurality of cascaded resonant circuits.

[0010] As a further description of the above technical scheme: any of the resonant circuits includes a first inductor, a first capacitor and a ground terminal.

[0011] As a further description of the above technical scheme: the input end and the output end are the same port, so that the second signal is transmitted in reverse.

[0012] As a further description of the above technical solution: the impedance matching is performed by the filter circuit, so that the characteristic impedance of the amplification circuit is matched with the source impedance of the filter circuit.

[0013] As a further description of the above technical solution: the impedance matching is performed by the filter circuit, so that the characteristic impedance of the amplification circuit is matched with the source impedance of the filter circuit.

[0014] As a further description of the above technical solution: the impedance matching is performed by the filter circuit, so that the characteristic impedance of the amplification circuit is matched with the source impedance of the filter circuit.

[0015] According to the number of cascaded resonant circuits, the total impedance ratio between the source impedance and the characteristic impedance is decomposed into a single-stage impedance ratio corresponding to each resonant circuit.

[0016] According to the single-stage impedance ratio processing, an intermediate impedance point is obtained.

[0017] According to the intermediate component point processing, the corresponding impedance of each resonant circuit is obtained.

[0018] As a further description of the above technical solution: the resonant circuit processes the parameters of the first inductor and the first capacitor according to the corresponding impedance and the preset cutoff frequency.

[0019] As a further description of the above technical solution: the amplification circuit includes a second capacitor and a superconducting quantum interference device connected in parallel with the second capacitor, the second capacitor is connected with the filter circuit, and the second capacitor is grounded with the superconducting quantum interference device.

[0020] As a further description of the above technical solution: the amplification circuit further includes a second inductor, one end of the second inductor is connected with the input end of the amplification circuit, the other end is grounded, and the second inductor is inductively coupled with the superconducting quantum interference device.

[0021] As a further description of the above technical solution: the second inductor receives the control signal sent to the superconducting quantum interference device, and performs parametric amplification with the first signal to generate the second signal, wherein the control signal is a pump signal and a magnetic flux bias current.

[0022] Further comprising a quantum computing amplification module, comprising: a circulator, the superconducting parametric amplifier of any one of the above technical solutions; the circulator is connected with the input end and the output end of the superconducting parametric amplifier.

[0023] Further comprising a quantum computer readout circuit, comprising a quantum chip, and the quantum computing amplification module connected with the quantum computing amplification module in the above technical solution, wherein the quantum computing amplification module is suitable for the superconducting parametric amplifier in the above technical solution,

[0024] The superconducting parametric amplifier receives the quantum signal sent by the quantum chip, filters it through a filtering circuit to obtain a first signal, amplifies the first signal through an amplification circuit to obtain a second signal, sends the second signal to the filtering circuit for reverse transmission, filters it again to generate a third signal, and outputs the third signal to the circulator.

[0025] The above technical solution has the following advantages or beneficial effects:

[0026] By integrating a filter circuit onto a superconducting parametric amplifier, the quantum signal is filtered before being sent to the amplifier circuit. The superconducting parametric amplifier amplifies the signal to obtain a second signal, which is then output through the filter circuit again. This reduces the number of components in the temperature range while maintaining the functionality of the quantum circuit, alleviating the space and cooling pressure in the temperature range and facilitating the expansion of more qubits. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 The circuit diagram of the superconducting parametric amplifier proposed in this invention is shown below.

[0029] Figure 2 This is a schematic diagram of the connection principle of the quantum computing amplification module proposed in this invention;

[0030] Figure 3 This is a schematic diagram of the connection principle of the readout circuit proposed in this invention;

[0031] Figure 4 This is a simulation test diagram of impedance matching in this invention;

[0032] Figure 5 This is a schematic diagram of parametric amplification using the superconducting parametric amplifier proposed in this invention.

[0033] Legend:

[0034] 1. Filtering circuit; 11. First inductor; 12. First capacitor; 13. Ground terminal; 2. Amplifier circuit; 21. Second capacitor; 22. Superconducting quantum interference device; 23. Second inductor; 3. Third capacitor; 4. Third inductor; 5. Quantum chip; 6. Circulator; 7. Superconducting parametric amplifier. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The existing quantum computer signal readout circuits filter and amplify the signal through low-pass filters, circulators, and superconducting parametric amplifiers. All components are located within the 20mK temperature range of the quantum computer. The superconducting parametric amplifier is connected to the quantum chip through circulators and low-pass filters. However, the large number of components causes space congestion within the temperature range, which affects the expansion of the number of qubits.

[0037] Reference Figure 1 One embodiment of the present invention provides: a superconducting parametric amplifier, comprising:

[0038] The input terminal is used to receive quantum signals sent by the quantum chip.

[0039] Filtering circuit 1 receives the quantum signal sent from the input terminal and filters it to obtain a first signal;

[0040] Amplifier circuit 2 receives the first signal sent by the filter circuit and the input control signal, and amplifies the first signal to obtain the second signal;

[0041] Amplifier circuit 2 sends the second signal to filter circuit 1, which filters it again to generate the third signal and outputs the third signal.

[0042] The third signal is output at the output terminal.

[0043] In this embodiment, a filter circuit 1 is provided on one side of the amplifier circuit 2. The filter circuit 1 has an input terminal connected to the circulator 6 to receive quantum signals. After the quantum signals are filtered by the filter circuit 1, a first signal is generated and sent to the amplifier circuit 2. The amplifier circuit 2 receives the input control signal, performs parametric amplification, and generates a second signal. The amplifier circuit 2 sends the second signal to the filter circuit 1, causing the second signal to pass through the filter circuit 1 again to generate a third signal. The third signal is then sent to the circulator 6 for output through the output terminal. The quantum signal is the electrical signal transmitted from the quantum chip 5 to the readout line. Compared to existing quantum circuits, by adding a filtering function to the superconducting parametric amplifier to replace the use of a low-pass filter, the number of components in the temperature range is reduced while maintaining the functionality of the quantum circuit, alleviating space and cooling pressure in the temperature range, and facilitating the expansion of more qubits.

[0044] The filter circuit 1 includes multiple cascaded resonant circuits, each of which includes a first inductor 11, a first capacitor 12, and a ground terminal 13.

[0045] In this embodiment, the filter circuit 1 consists of three cascaded resonant circuits, wherein the first inductor 11 is connected to one end of the first capacitor 12, and the other end of the first capacitor 12 is grounded through the ground terminal 13.

[0046] Specifically, the three cascaded resonant circuits include inductors L1, L2, and L3, and capacitors C1, C2, and C3. Capacitor C1 is connected to one end of inductor L1, capacitor C2 is connected between the other end of inductor L1 and inductor L2, and capacitor C3 is connected between inductor L2 and inductor L3. Capacitors C1, C2, and C3 are grounded.

[0047] The input terminal and the output terminal are the same port, enabling the second signal to be transmitted in reverse.

[0048] In this embodiment, the input and output terminals are the same port and connected to the circulator 6. The second signal generated by the amplifier circuit 2 is transmitted in reverse to the filter circuit 1 to generate the third signal, which is then output from the same port. The circulator 6 is used to separate the quantum signal sent to the superconducting parametric amplifier 7 and the received third signal.

[0049] Impedance matching is achieved through filter circuit 1, so that the characteristic impedance of amplifier circuit 2 is matched with the source impedance of filter circuit 1.

[0050] In this embodiment, the input or output terminal is connected to the first port of the filter circuit 1, which is connected to inductor L1 and capacitor C1. The second port of the filter circuit 1 is connected to the end of inductor L3 furthest from capacitor C3. Impedance matching is achieved through three cascaded resonant circuits. This ensures that the impedance between the first and second ports of the filter circuit 1 is proportionally decomposed and matched, guaranteeing a wideband flat response. To obtain the maximally flat response, the impedance transformation ratio of each stage should be the same and uniformly distributed on an exponential scale.

[0051] Impedance matching involves impedance transformation based on multiple cascaded resonant circuits.

[0052] In this embodiment, the source impedance of the filter circuit 1 is generally 50Ω, while the characteristic impedance of the amplifier circuit 2 in the working state is 5Ω. The existing superconducting parametric amplifier 7 uses a single-stage transformation, which has a narrow bandwidth and an uneven frequency response. By performing a three-stage transformation through three cascaded resonant circuits, the bandwidth can be expanded and a flatter response can be achieved.

[0053] Impedance transformation based on multiple cascaded resonant circuits includes:

[0054] Based on the number of cascaded resonant circuits, the total impedance ratio between the source impedance and the characteristic impedance is decomposed into the single-stage impedance ratio corresponding to each resonant circuit.

[0055] The intermediate impedance point is obtained by processing the single-stage impedance ratio.

[0056] The impedance of each resonant circuit is obtained by processing the intermediate component points.

[0057] In this embodiment, the total impedance ratio 50Ω / 5Ω = 10 is decomposed into three stages of transformation, with each stage having an impedance ratio of 10^(1 / 3), approximately 2.154, meaning that each stage reduces the impedance by about 2.154 times. This decomposition is based on transmission line or network synthesis theory, ensuring that each stage of the resonant circuit has the same transformation amount, thereby minimizing the reflection coefficient within the passband.

[0058] The intermediate impedance point is obtained by processing the single-stage impedance ratio. The intermediate impedance point is the reference impedance of the interface between resonant circuit stages, ensuring that the input and output of the inductor L of each resonant circuit are matched, so that the impedance of each resonant circuit is reduced step by step.

[0059] The intermediate impedance of L1 is 50 / 2.154 = 23.2Ω;

[0060] The intermediate impedance of L2 is: 23.2 / 2.154 = 10.8Ω;

[0061] The intermediate impedance of L3 is: 10.8 / 2.154 = 5Ω;

[0062] Use the intermediate impedance point as the interstage matching point to ensure that the output impedance of the preceding stage is equal to the input impedance of the following stage, thus avoiding reflection.

[0063] Calculate the corresponding impedance Z of each stage of the resonant circuit based on the intermediate impedance point:

[0064]

[0065] By using three cascaded resonant circuits, the impedance of the quantum signal gradually decreases as it passes through filter circuit 1.

[0066] The resonant circuit processes the parameters of the first inductor 11 and the first capacitor 12 based on the corresponding impedance and the preset cutoff frequency.

[0067] In this embodiment, in the LC circuit formed by the first inductor 11 and the first capacitor 12, according to:

[0068] impedance

[0069] Cutoff frequency:

[0070] The parameters of the first inductor 11 and the first capacitor 12 of each stage are obtained through processing. The cutoff frequency is equivalent to the frequency of the filter circuit 1. The cutoff frequency is set according to the filtering requirements. If the passband of the filter circuit 1 is required to be ≤7GHz, the cutoff frequency input is 7GHz.

[0071] Table 1 shows the parameters of inductors L1, L2, and L3, as well as capacitors C1, C2, and C3 in this embodiment.

[0072] Element C1 L1 C2 L2 C3 L3 Value 0.67 pF 0.77 nH 1.44 pF 0.36 nH 3.1 pF 0.17 nH

[0073] Table 1

[0074] Furthermore, based on the requirement that the out-of-band rejection of filter circuit 1 is ≥15dB, the optimal gain of superconducting parametric amplifier 7 needs to be ≥12dB and the bandwidth ≥0.4GHz. Parameter tuning simulations are used to obtain the target parameters. These target parameters are derived from the entire readout circuit and the qubit readout frequency. The system determines which out-of-band spurious signals need to be suppressed based on the entire readout circuit, and based on the qubit readout frequency (e.g., if it's 5GHz), the passband of filter circuit 1 needs to cover 5GHz. Automated adjustments are performed using simulation software, setting the upper and lower ranges for each parameter, such as 10%, 20%, and 30%. The simulation software operates on values ​​within these offsets and provides simulation results (see reference). Figure 4 The results of the target parameters obtained through simulation are shown in Table 2.

[0075] Element C1 L1 C2 L2 C3 L3 Value 0.92 pF 1.1 nH 2.4 pF 0.59 nH 4.4 pF 0.24 nH

[0076] Table 2

[0077] Reference Figure 4 The target parameters obtained from the simulation were used in filter circuit 1, and the impedance was matched from 50Ω to 5Ω. Within the 3-7GHz band, S21 ≥ -0.1dB, indicating low insertion loss, and S11 ≤ -12dB, indicating low reflection, meeting the requirements for use within the band. Simultaneously, for frequencies above 8GHz outside the band, S21 ≤ -15dB, providing sufficient suppression, thus meeting the filtering requirements of the superconducting parametric amplifier 7.

[0078] The amplifier circuit 2 includes a second capacitor 21 and a superconducting quantum interference device 22 connected in parallel with the second capacitor 21. The second capacitor 21 is connected to the second port of the filter circuit 1, and the second capacitor 21 and the superconducting quantum interference device 22 are grounded.

[0079] In this embodiment, the amplifier circuit 2 includes a second capacitor 21 (C0) and a superconducting quantum interference device 22 (L0). The second capacitor 21 and the superconducting quantum interference device are connected in parallel and connected to the second port, so that the filtered first signal is transmitted to the superconducting quantum interference device for amplification to generate the second signal.

[0080] Specifically, the superconducting quantum interference device 22 is composed of two Josephson junctions connected in parallel.

[0081] In this embodiment, the superconducting quantum interference device 22 is divided into two types: double junction (DC-SQUID) and single junction (RF-SQUID). The single junction reads the magnetic flux signal through the radio frequency resonant circuit, while the double junction uses the magnetic flux-voltage characteristics under DC bias for magnetic flux modulation. Optionally, a double junction structure is adopted to receive the pump signal and magnetic flux bias current, which interact with the quantum signal to excite the nonlinear oscillation of the Josephson junction for parametric amplification.

[0082] The amplifier circuit 2 also includes a second inductor 23, one end of which is connected to the input terminal of the amplifier circuit 2 and the other end is grounded. The second inductor 23 is mutually inducted with the superconducting quantum interference device 22.

[0083] In this embodiment, one end of the second inductor 23 is connected to the input terminal of the amplifier circuit 2 to receive the control signal, and the other end is grounded. Through the mutual inductance between the second inductor 23 and the superconducting quantum interference device 22, the control signal and the first signal excite the nonlinear oscillation of the Josephson junction at the superconducting quantum interference device 22, generating the second signal.

[0084] The second inductor 23 receives the control signal and sends it to the superconducting quantum interference device 22, where it is parametrically amplified with the first signal to generate the second signal. The control signal consists of a pump signal and a magnetic flux bias current.

[0085] In this embodiment, the third capacitor 3 is connected to an external microwave signal source to receive the input pump signal. Through a parametric amplification process, energy is efficiently transferred to the first signal to be amplified. The third inductor 4 is connected to an external DC signal source to receive the magnetic flux bias current I. The magnetic flux bias current I is DC, and the current adjusts the magnetic flux bias in the Josephson junction region of the superconducting quantum interference device 22. The magnetic flux bias can set the resonant frequency between the superconducting quantum interference device 22 (L0) and the second capacitor 21 (C0). This is connected to the filter circuit 1 to form a superconducting parametric amplifier 7. Filtering and impedance matching are then performed through the filter circuit 1 (see reference). Figure 5 The second signal is generated through parametric amplification, and the impedance is matched from 50Ω to 5Ω. The insertion loss within the 3-7GHz band is ≤0.1dB, meeting the requirements for the superconducting parametric amplifier 7. The superconducting parametric amplifier 7 has a gain S21 ≥12dB in the 4.8-5.2GHz band, and an out-of-band gain S21 ≤ -15dB ≥8GHz, with an out-of-band rejection of 15dB, and also has filtering capabilities. The 10GHz resonant peak is mainly caused by the pump signal.

[0086] The superconducting parametric amplifier 7 is based on a three-wave mixing process, where a pump signal interacts with a first signal to generate a second signal whose frequency is related to the first signal. In the three-wave mixing, the frequency relationship ωs + ωi = ωp is satisfied, where ωp is the pump signal frequency, and ωs and ωi are the signal and idle frequencies, respectively. Impedance transformation can significantly increase the bandwidth.

[0087] Reference Figure 2 It also includes a quantum computing amplification module, comprising: a circulator 6 and a superconducting parametric amplifier 7 as described in any of the above technical solutions; the circulator 6 is connected to the input and output terminals of the superconducting parametric amplifier 7.

[0088] In this embodiment, the superconducting parametric amplifier 7 is connected to at least one circulator 6, which is used to separate the quantum signal sent to the superconducting parametric amplifier 7 and the received third signal to avoid mutual interference between the signals.

[0089] Reference Figure 3 It also includes a quantum computer readout circuit, comprising a quantum chip 5 connected to the quantum computing amplification module described in the above technical solution. The quantum computing amplification module is adapted to the superconducting parametric amplifier 7 described in the above technical solution. The superconducting parametric amplifier 7 receives the quantum signal sent by the quantum chip 5, filters it through the filter circuit 1 to obtain a first signal, amplifies the first signal through the amplification circuit 2 to obtain a second signal, sends the second signal to the filter circuit 1 for reverse transmission, filters it again to generate a third signal, and outputs the third signal to the circulator 6.

[0090] In this embodiment, the circulator 6 can perform unidirectional signal transmission and is equipped with three interfaces to separate the quantum signal input to the superconducting parametric amplifier 7 and the third signal output by the superconducting parametric amplifier 7. The quantum chip 5 transmits the quantum signal through the first interface of the circulator 6. The second interface of any circulator 6 is connected to the filter circuit 1 of the superconducting parametric amplifier 7, sending the quantum signal to the superconducting parametric amplifier 7. After filtering and parametric amplification by the filter circuit 1 and the amplification circuit 2, a second signal is generated. The second signal is then transmitted in reverse for filtering to generate a third signal, which is sent back to the second interface of the circulator 6. The circulator 6 separates the quantum signal and the third signal, and outputs the third signal from the third interface of the circulator 6 to the high electron mobility transistor (HEMT) of the readout line. The use of the low-pass filter in the existing scheme is eliminated. While maintaining the function of the quantum circuit, the number of components in the temperature range is reduced, alleviating the space and cooling pressure in the temperature range and facilitating the expansion of more qubits.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A superconducting parametric amplifier, characterized in that, include: The input terminal is used to receive quantum signals sent by the quantum chip. A filtering circuit receives the quantum signal sent from the input terminal, filters it, and obtains a first signal. An amplifier circuit receives a first signal sent by the filter circuit and an input control signal, and amplifies the first signal to obtain a second signal. The amplifier circuit sends the second signal to the filter circuit, which filters it again to generate the third signal. The third signal is output at the output terminal.

2. The superconducting parametric amplifier according to claim 1, characterized in that: The filter circuit includes multiple cascaded resonant circuits.

3. The superconducting parametric amplifier according to claim 2, characterized in that: Any of the resonant circuits described herein includes a first inductor, a first capacitor, and a ground terminal.

4. The superconducting parametric amplifier according to claim 1, characterized in that: The input terminal and the output terminal are the same port, enabling the second signal to be transmitted in reverse.

5. The superconducting parametric amplifier according to claim 2, characterized in that: Impedance matching is performed through the filter circuit to match the characteristic impedance of the amplifier circuit with the source impedance of the filter circuit.

6. The superconducting parametric amplifier according to claim 5, characterized in that: The impedance matching is performed by impedance transformation based on multiple cascaded resonant circuits.

7. The superconducting parametric amplifier according to claim 6, characterized in that: The impedance transformation based on the multiple cascaded resonant circuits includes: Based on the number of cascaded resonant circuits, the total impedance ratio between the source impedance and the characteristic impedance is decomposed into the single-stage impedance ratio corresponding to each resonant circuit. The intermediate impedance point is obtained based on the single-stage impedance ratio. The impedance of each resonant circuit is obtained by processing the intermediate component points.

8. The superconducting parametric amplifier according to claim 6, characterized in that: The resonant circuit processes the parameters of the first inductor and the first capacitor based on the corresponding impedance and the preset cutoff frequency.

9. The superconducting parametric amplifier according to claim 1, characterized in that: The amplification circuit includes a second capacitor and a superconducting quantum interference device connected in parallel with the second capacitor. The second capacitor is connected to the filter circuit and grounded with the superconducting quantum interference device.

10. The superconducting parametric amplifier according to claim 9, characterized in that: The amplification circuit also includes a second inductor, one end of which is connected to the input terminal of the amplification circuit and the other end is grounded. The second inductor is mutually inducted with the superconducting quantum interference device.

11. The superconducting parametric amplifier according to claim 10, characterized in that: The second inductor receives the control signal and sends it to the superconducting quantum interference device, where it is parametrically amplified with the first signal to generate the second signal, wherein the control signal is a pump signal and a magnetic flux bias current.

12. A quantum computing amplification module, characterized in that, include: A circulator, a superconducting parametric amplifier according to any one of claims 1-11; the circulator is connected to the input and output terminals of the superconducting parametric amplifier.

13. A quantum computer readout circuit, characterized in that, include: A quantum chip, wherein the quantum chip is connected to the quantum computing amplification module according to claim 12, wherein the quantum computing amplification module is adapted to the superconducting parametric amplifier according to claims 1-11. The superconducting parametric amplifier receives the quantum signal sent by the quantum chip, filters it through a filtering circuit to obtain a first signal, amplifies the first signal through an amplification circuit to obtain a second signal, sends the second signal to the filtering circuit for reverse transmission, filters it again to generate a third signal, and outputs the third signal to the circulator.

Images