46results 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.

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 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).

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.

[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.

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.

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.

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.

A radio-frequency (RF) to direct current (DC) converter is provided. When a DC electrical current is applied via a DC input port of the converter, the DC electrical current is shunted to ground through a Josephson junction (JJ) of the converter and substantially no DC electrical current flows through a resistor of the converter, and when an RF electrical current is applied via an RF input port of the converter, output trains of SFQ current pulses from a DC to SFQ converter of the RF-to-DC converter with pulse-to-pulse spacing inversely proportional to the RF electrical current frequency cause the JJ to switch at a rate commensurate with an RF frequency of the RF electrical current to generate a steady state voltage across the JJ linearly dependent on the RF frequency.

A bandpass parametric amplifier circuit includes a plurality of unit cells. At least one unit cell includes a first inductor having a first node coupled to a center conductor and a second node coupled to ground. There is a first capacitor having a first node coupled to the center conductor and a second node coupled to ground. There is a second inductor having a first node coupled to the center conductor. A second capacitor has a first node coupled to a second node of the second inductor. The second capacitor and the second inductor are in series with the center conductor.

A Josephson parametric device is presented that 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 sections. 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 within the first passband and the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal to a second signal having a second frequency within the second passband.

Output amplifier comprising a stack of compound superconducting quantum interference device (SQUID) output amplifier stages and related methods are provided. A method includes receiving a first pulse train comprising a first plurality of single flux quantum (SFQ) pulses. The method may further include receiving a second pulse train comprising a second plurality of SFQ pulses, where the second pulse train is delayed by a predetermined fraction of a clock cycle relative to the first pulse train. The method may further include using the stack of the plurality of compound SQUID output amplifier stages converting the first plurality of SFQ pulses and the second plurality of SFQ pulses into a voltage waveform, where each of the plurality of compound SQUID output amplifier stages comprises a pair of superconducting quantum interference devices (SQUIDs).

In a general aspect, parametric amplification is performed in a quantum computing system. In some cases, a traveling wave parametric amplifier (TWPA) includes a plurality of Josephson junctions connected in series. The plurality of Josephson junctions includes a first Josephson junction, which includes a first superconducting electrode on a surface of a substrate, a second superconducting electrode that overlaps the first superconducting electrode, and a barrier sandwiched between overlapping sections of the first and second superconducting electrodes. The barrier defines a footprint with a tapered shape over the surface of the substrate.

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

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.

A traveling wave kinetic inductance parametric amplifier is presented. The amplifier includes a microstrip structure defining a parallel plate capacitor element formed by first and second electrically conductive layers spaced by a dielectric spacer layer. The first electrically conductive layer is made of superconducting material composition having desirably high kinetic inductance and being configured as a nanoscale thickness strip.

To present a Josephson parametric device that includes an input port, an output port, and a signal path between the input port and the output port.SOLUTION: A signal path includes a first section coupled to an input port and having a first passband, a second section coupled to an output port and having a second passband, and a Josephson junction coupling element for parametric coupling between the first and second sections. The Josephson junction coupling element is coupled to and interposed between the first and second sections. The Josephson junction coupling element is configured such that the input port receives a first signal at a first frequency within the first passband, and in response to the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal to a second signal at a second frequency within the second passband.SELECTED DRAWING: Figure 1

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.