80results about "Superconductive amplifiers" patented technology

A system and method are disclosed for a superconducting traveling-wave parametric amplifier (TWPA) with improved control and performance. In a preferred embodiment, the amplifier comprises an integrated array of symmetric rf-SQUIDs in a transmission line structure. A device was fabricated using niobium superconducting integrated circuits, and confirmed predicted performance, with a maximum gain up to 17 dB and a bandwidth of 4 GHz. A similar device can be applied as a low-noise, low-dissipation microwave amplifier for output from a superconducting quantum computer, or as a preamplifier, switch, or frequency converter for a sensitive microwave receiver, or as an output amplifier for a frequency-multiplexed superconducting detector array.

A device comprises a superconducting parametric interferometric circuit, which comprises a signal input port and a signal output port, and a first parametric mixing circuit and a second parametric mixing circuit coupled in parallel between the signal input port and the signal output port. The signal input port configured to receive an input signal having a first frequency. The first parametric mixing circuit is configured to convert the input signal to a first output signal having a second frequency, and the second parametric mixing circuit is configured to convert the input signal to a second output signal having the second frequency. The superconducting parametric interferometric circuit is configured to constructively combine the first and second output signals at the signal output port to generate an output signal having the second frequency, and provide isolation of the signal input port from a signal which is present at the signal output port.

This application relates to an integrated filtering and amplification device for quantum computing measurement and control, comprising: a device housing, a circuit board, a front-end attenuation component, a front-end bandpass filter component, a microwave amplification component, a rear-end attenuation component, and a rear-end bandpass filter component. The front-end bandpass filter component, the front-end attenuation component, the microwave amplification component, the rear-end attenuation component, and the rear-end bandpass filter component are sequentially connected to the circuit board and are all integrated within the device housing. By integrating a microwave front-end module with a bandpass filter, attenuator, and microwave amplifier, the complexity of external circuitry is greatly reduced. Furthermore, the integrated front-end module is small in size and can be directly integrated into electronic devices, allowing the measurement and control pulses generated from the electronic devices to be directly connected to the dilution refrigerator, greatly simplifying external wiring and improving system reliability.

The invention relates to a microwave signal amplifier comprising a chain of nonlinear inductive dipole elements each forming an asymmetric superconducting loop with Josephson junctions, said chain being arranged between an input of the chain for applying a signal to be amplified and an output of the chain at which an output signal is developed, the amplifier further comprising a controllable magnetic flux generation system for circulating a current in said loops, the amplifier further comprising a first microwave pump and means for coupling said input of the chain to the first pump, the first pump generating through the first coupling means a wave in the chain in the direction from the input to the output of frequency adjusted to transfer power at the frequency of the signal to be amplified.The device further comprises a second microwave pump and a second means for coupling said output of the chain to said second pump, the second pump generating through the second coupling means a wave in the chain in the direction from the output to the input, at a frequency different from that of the first pump and so as to attenuate in said direction from the output to the input the microwaves propagating at the frequency of the signal to be amplified. Figure for the abstract: Fig. 1.

The present disclosure relates to a TWPA device (1) for a quantum computer having a two- band dispersion relation and being configured to implement 3-wave mixing. The TWPA device (1) comprises chained unit cells (ø), each one comprising a nonlinear inductance element (5) and a capacitor (6) connected to a ground (7) thereof. The unit cells (ø) further comprises one of a resonator circuit (8) and periodically modulated input parameters. The two-band dispersion relation is composed of a lower frequency band and an upper frequency band with a frequency-gap in-between. Further, the TWPA device (1) is configured to receive an amplification signal, receive a pump signal at said input (2). The pump signal having a frequency being in said upper frequency band and being at least 2 / 3 of a cut-off frequency of said TWPA device (1), or said pump signal having a frequency being in said lower frequency band, wherein a second harmonic thereof is within said frequency-gap.

A frequency selector for superconducting parametric amplifiers. According to illustrative embodiments, a frequency selector system for superconducting parametric amplifiers may comprise a Josephson traveling wave parametric amplifier (JTWPA) for producing entangled photon pairs at signal frequency and idler frequency, a resonator electrically connected to the JTWPA for tuning the signal frequency and idler frequency to an application frequency, and an inverse diplexer electrically connected to the resonator for separating the signal frequency and the idler frequency. In some embodiments, a frequency selector system for superconducting parametric amplifiers, comprising a Josephson traveling wave parametric amplifier (JTWPA) for producing entangled photon pairs at signal frequency and idler frequency; a resonator electrically connected to the JTWPA for tuning the signal frequency and idler frequency to an application frequency; and a multiplexer electrically connected to the resonator for separating the signal frequency and the idler frequency.

To provide a superconducting device implemented with a surface acoustic wave resonator and a superconducting microwave resonator that are coupled to a Josephson ring modulator, and methods of applications thereof.SOLUTION: A method comprises: receiving, by a microwave Josephson mixer and from a superconducting surface acoustic wave resonator of a superconducting device, a surface acoustic wave signal that comprises one or more phonons that resonate at a first frequency; receiving, by the microwave Josephson mixer and from a superconducting microwave resonator of the superconducting device, a microwave signal that comprises one or more photons that can resonate at a second frequency; and mixing, by the microwave Josephson mixer, the surface acoustic wave signal and the microwave signal on the basis of a microwave control signal received from a microwave source operatively coupled to the microwave Josephson mixer.SELECTED DRAWING: Figure 8

The present disclosure relates to a frequency multiplexer (1) comprising a first port (2a), a plurality of second ports (2b), each second port (2b) being associated with a specific frequency band and a plurality of signal filtering portions (30, 40, 50, 60) connecting each second port to said first port (2b). Each signal filtering portion (30, 40, 50, 60) is one of a high-pass signal filtering portions (30), low-pass signal filtering portions (40), band-pass signal filtering portions (50), and band-stop signal filtering portion (60). Furthermore, each signal filtering portion (30, 40, 50, 60) comprises chains of superconducting junctions (35, 45, 55, 65).

A traveling-wave parametric amplifier (TWPA) transmission line having an improved bandwidth includes one or more unit cells. Each unit cell includes a capacitor and a Josephson junction connected in series and leading to ground, configured to provide inductance and non-linearity. One or more distributed resonators are coupled to the transmission line. The distributed resonators are configured to (i) use a first harmonic mode of the resonator for resonance phase matching in the transmission line and (ii) prevent the second mode of the resonator from interacting with the intermodulation product of the transmission line.

The present application provides a method and apparatus for determining a superconducting impedance transformation parametric amplifier, a superconducting impedance transformation parametric amplifier, an electronic device, a computer program product, and a computer-readable storage medium, and the method for determining a superconducting impedance transformation parametric amplifier includes the steps of: calculating an impedance value of an impedance transformation line of a superconducting impedance transformation parametric amplifier and a capacitance value of the amplifier based on a wavelength parameter, a gain parameter, and a bandwidth parameter; calculating a linewidth size of a coplanar waveguide of the superconducting impedance transformation parametric amplifier based on the impedance value of the impedance transformation line; calculating a stub size of the superconducting impedance transformation parametric amplifier based on the impedance value of the impedance transformation line and the capacitance value of the amplifier; and determining a structural parameter of the superconducting impedance transformation parametric amplifier based on the linewidth size and the stub size.

The present invention relates to a quantum magnetic field receiving device including a superconducting quantum interference device (SQUID) or a superconducting quantum interference filter (SQIF) and an electrostatic gating circuit configured to apply electrostatic fields to Josephson Junctions of the SQUID or SQIF.

According to an example aspect of the present invention, there is provided a travelling wave parametric amplifier comprising a transmission line comprising therein a plurality of Josephson elements and a plurality of shunt capacitors, and wherein at least some of the shunt capacitors are dispersive capacitors comprising an open- ended, distributed transmission line.

The disclosure is towards parametric amplifiers with inductive input coupling for quantum computing systems. One example aspect of the present disclosure is directed to a quantum computing system comprising a first qubit, a first measurement device, and a first amplifier. The first measurement device is configured to generate a first qubit signal corresponding to a first quantum state of the first qubit. The first amplifier is configured to amplify the first qubit signal. The first amplifier comprises a first transmission-line resonator. The first transmission-line resonator provides an inductive reactance for an electrical coupling between the first measurement device and the first amplifier. The inductive reactance for the electrical coupling enables a transmission of the first qubit signal.

One example includes an amplifier system. The system includes an input configured to receive an input pulse, a first input path coupled to the input and configured to provide the input pulse to a control node, and a second input path coupled to the input and comprising at least one delay element to provide a delayed version of the input pulse to the control node. The system also includes a first amplifier device comprising the control node and being configured to provide a control flux in response to the input pulse and in response to the delayed version of the input pulse. The system further includes a second amplifier device coupled to the first amplifier device, the second amplifier device being set to a flux state in response to the control flux to provide an output voltage.

[Problem] To provide a magnetic flux-type superconducting quantum circuit element that has a practically tolerable anharmonicity and enables densification by avoiding addition of a shunt capacitor, thereby achieving an increased coherence time, and a superconducting quantum computer in which the element is used. [Solution] The problem is solved by a large-area junction magnetic flux-type superconducting quantum circuit element characterized in that the superconducting quantum circuit element is based on a magnetic flux-type superconducting quantum circuit element which comprises three Josephson junctions for one loop and into which an α junction ratio is introduced such that the area of one Josephson junction among the three Josephson junctions is α (0.3≦α≦0.7) times the area of the other Josephson junctions having an equal area, wherein the junction cross-sectional area of the three Josephson junctions is set to be large at β (2≦β≦200) times the junction cross-sectional area of the basic magnetic flux-type superconducting quantum circuit element while the α junction ratio is maintained, whereby an increased coherence time is achieved.

A parametric traveling wave amplifier (200) is disclosed in which the amplifiers include: a co-planar waveguide, in which the co-planar waveguide includes at least one Josephson junction (210) interrupting a center trace (204) of the co-planar waveguide; and at least one shunt capacitor coupled to the co-planar waveguide, in which each shunt capacitor of the at least one shunt capacitor includes a corresponding superconductor trace (214) extending over an upper surface of the center trace of the co-planar waveguide, and in which a gap separates the superconductor trace from the upper surface of the center trace, and in which the co-planar waveguide including the at least one Josephson junction and the shunt capacitor establish a predefined overall impedance for the traveling wave parametric amplifier.

A Josephson traveling wave parametric amplifier (JTWPA) comprising an input for receiving a signal, an output for providing an amplified output of the signal and one or more circuit segments in series between the input and the output and is configured for receiving a pump tone for transferring energy from the pump tone to the signal and to an idler tone. Each of the one or more circuit segments comprises, in series, one or more superconducting nonlinear elements in series, and a first resonator with a first fundamental resonance frequency configured for phase matching the pump tone with the signal and the idler tone and a second resonator with a second fundamental resonance frequency configured for mitigating pump depletion at a frequency corresponding to a higher harmonic of the pump tone with the second fundamental resonance frequency being higher than the first fundamental resonance frequency.

The invention relates to a low-noise amplifier device in a liquid nitrogen temperature zone. The amplifier device includes a first stage die cell, a second stage die cell, an inter-stage matching circuit, and an output matching circuit. The first-stage tube core unit comprises an amplifier GaAS pHEMT tube core T1, S parameters of a gold wire L1 and a gold wire L2, an input blocking capacitor C1, a T1 gate bias circuit, a T1 drain bias circuit and an RLC feedback circuit. The second-stage tube core unit comprises a GaAs pHEMT tube core T2, S parameters of a gold wire L3 and a gold wire L4, a T2 gate bias circuit, a T2 drain bias circuit and an RLC feedback circuit. The low-temperature amplifier can work below a liquid nitrogen temperature zone, is low in noise temperature and high in gain flatness in a broadband range, and can be well used as a low-noise amplification circuit.

The disclosure is towards parametric amplifiers with inductive input coupling for quantum computing systems. One example aspect of the present disclosure is directed to a quantum computing system comprising a first qubit, a first measurement device, and a first amplifier. The first measurement device is configured to generate a first qubit signal corresponding to a first quantum state of the first qubit. The first amplifier is configured to amplify the first qubit signal. The first amplifier comprises a first transmission-line resonator. The first transmission-line resonator provides an inductive reactance for an electrical coupling between the first measurement device and the first amplifier. The inductive reactance for the electrical coupling enables a transmission of the first qubit signal.

The present disclosure relates to a dynamic inductive parametric amplifier comprising an input port arranged to receive a pump tone, a DC bias and an input signal, an output port arranged to provide an amplified version of the input signal, a tunable stepped impedance component arranged to attenuate and / or filter a predetermined frequency band, and a high dynamic inductor line. The tunable stepped impedance component is tuned at a frequency that allows the amplifier to resonate at a predetermined frequency, and the pump tone has a frequency higher than the input signal, and the DC bias signal is sent to the high dynamic inductor line.

The present disclosure relates to a TWPA device (1) for a quantum computer, which has a two-band dispersion relation and is configured to perform three-wave mixing. The TWPA device (1) comprises a chain of unit cells (φ), each comprising a non-linear inductance element (5) and a capacitor (6) connected to its ground (7). The unit cell (φ) further comprises a resonator circuit (8) and one of the periodically modulated input parameters. The two-band dispersion relation is composed of a lower frequency band and a higher frequency band, sandwiching a frequency gap. Further, the TWPA device (1) is configured to receive an amplified signal and a pump signal at the input (2). The pump signal is in the higher frequency band described above and has a frequency that is at least 2 / 3 of the cut-off frequency of the TWPA device (1) described above, or the pump signal described above is in the lower frequency band described above and its second harmonic has a frequency within the frequency gap described above.

Disclosed is a method of manufacturing a Josephson travelling wave parametric amplifier, JTWPA (400), which comprises providing, on a substrate (406), a bottom conductive layer (404, 405), a dielectric layer (408), and a top conductive layer (403), the top conductive layer at least partly forming nonlinear inductors (409), top capacitor plates of parallel plate capacitors and / or conductive strips interrupted by nonlinear inductors, wherein the top conductive layer (403) is formed using a single instance of an angled evaporation method. The nonlinear inductors (409) may comprise one or more Josephson junctions, and the bottom conductive layer (404, 405) may form a CPW transmission line structure (402).

A circuit device includes a semiconductor device and an impedance matching network. The impedance matching network includes a superconductor material forming at least one inductor of the circuit device, and the superconductor material exhibits a kinetic inductance per unit square when in a superconducting state. The impedance matching network is configured to transform an impedance of the semiconductor device to match a predetermined second impedance during operation of the circuit device.

The invention relates to a microwave signal amplifier comprising a chain of nonlinear inductive dipole elements, each forming a superconducting asymmetric loop with Josephson junctions, the chain being arranged between an input of the chain for applying a signal to be amplified and an output of the chain at which an output signal is generated, the amplifier further comprising a controllable magnetic flux generation system for circulating a current in the loops, the amplifier further comprising a first microwave pump and a means for coupling the input of the chain to the first pump, the first pump generating, through the first coupling means, a wave in the chain in the direction from the input towards the output, the frequency of which wave is adjusted in order to transfer power at the frequency of the signal to be amplified. The device further comprises a second microwave pump and a second means for coupling the output of the chain to the second pump, the second pump generating, through the second coupling means, a wave in the chain in the direction from the output towards the input, at a frequency that is different from that of the first pump, so as to attenuate, in said direction from the output towards the input, the microwaves propagating at the frequency of the signal to be amplified.

A device comprises a superconducting parametric interferometric circuit, which comprises a signal input port (P1) and a signal output port (P2), and a first parametric mixing circuit (420-1) and a second parametric mixing circuit (420-2) coupled in parallel between the signal input port and the signal output port. The signal input port configured to receive an input signal having a first frequency. The first parametric mixing circuit is configured to convert the input signal to a first output signal having a second frequency, and the second parametric mixing circuit is configured to convert the input signal to a second output signal having the second frequency. The superconducting parametric interferometric circuit is configured to constructively combine the first and second output signals at the signal output port to generate an output signal having the second frequency, and provide isolation of the signal input port from a signal which is present at the signal output port. Alternatively, the first parametric mixing circuit (620-1) and the second parametric mixing circuit (620-2) are serially cascaded and a delay line (630) is coupled in parallel between the signal input port and the signal output port.

Method for stabilizing a non-linear parametric amplifier array comprising N non-linear resonator modes, linear and non-linear couplings between sites, external coherent control fields on each site and input / output ports to send and retrieve an amplified signal; the method comprising: setting the phases of the external coherent control fields to grow linearly with site index, dividing the N sites of the array in 3 regions, setting, in the central region, an homogeneous steady-state solution, assuming periodic boundary conditions, and setting the central quantities to produce directional topological amplification in an homogeneous system; in the left and right buffer regions, imposing to some quantities a smoothly increasing or decreasing profile function from the boundaries to the center; choosing external coherent control frequencies or bare resonator frequencies to locally compensate for the photon number-dependent frequency shifts induced by non-linearities; and solving the exact steady-state mean-field displacements assuming open boundary conditions.

The invention provides a superconducting quantum computing room temperature amplifier which is applied to the technical field of quantum bit amplification and reading. According to the amplifier, a kovar metal cavity comprises a plurality of radio frequency isolation cavities which are isolated from one another through partition walls and are electrically connected through radio frequency transmission glass beads sintered in the partition walls; the power supply isolation cavity and the plurality of radio frequency isolation cavities are mutually spatially and electromagnetically isolated in the vertical direction, and the power supply isolation cavity and the plurality of radio frequency isolation cavities are electrically connected through a plurality of sintered power supply transmission glass beads in the vertical direction; the multi-stage radio frequency amplification circuit performs multi-stage amplification processing on the radio frequency signal and outputs a target radio frequency signal; the double-layer power supply device and circuit comprises a four-layer PCB and double-face power supply devices, the periphery of the four-layer PCB is grounded, wrapped with gold, welded, suspended and fixed to the inner side wall of the power supply isolation cavity, and the double-face power supply devices are distributed on the upper side and the lower side of the four-layer PCB. And a plurality of power supply transmission glass beads penetrating through the four layers of PCBs and the bottoms of the plurality of radio frequency isolation cavities are sintered to supply power to the multi-stage radio frequency amplification circuit.

A Josephson parametric device is presented, which includes an input port, an output port, and a signal path between the input port and the output port. The signal path includes a first section coupled to the input port and having a first passband, a second section coupled to the output port and having a second passband and a Josephson junction coupling element for parametric coupling between the first and second section. The Josephson junction coupling element is coupled to and interposed between the first section and the second section. The Josephson junction coupling element is configured such that, in response to the input port receiving a first signal at a first frequency lying within the first passband and the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal into a second signal with a second frequency lying within the second passband.