22 results about "Superconducting loop" patented technology

The present disclosure relates to a second-order gradient independent input feedback superconducting quantum interference device and a preparation method thereof, comprising: eight superconducting pads, the eight superconducting pads comprising four input superconducting pads and four negative feedback superconducting pads, one input superconducting pad and one negative feedback superconducting pad forming one superconducting loop, the four superconducting loops being in parallel and arranged in a central symmetry; an input coil, the input coil being coupled with the four input superconducting pads; and a negative feedback coil, the negative feedback coil being coupled with the four negative feedback superconducting pads. The present disclosure can effectively reduce the crosstalk phenomenon between the input coil and the feedback coil, and improve the coupling coefficient and the transfer efficiency of the input coil and the feedback coil.

A persistent current switch is disclosed for controlling, e.g. initiating, a persistent current in a superconductor loop. The persistent current switch comprises a piece of superconductor material that is part of the superconductor loop. Further, the persistent current switch comprises an illumination system that is configured to direct light onto the piece of superconductor material for influencing an electrical resistance of the piece of superconductor material. The illumination system is configured such that the light impinging on the piece of superconductor material substantially does not heat the piece of superconductor material.

The invention relates to a frequency-adjustable superconducting quantum coupler capable of naturally resisting magnetic flux noise, which comprises a DC-SQUIDs (Direct Current-Superconducting Quantum IDs), namely a superconducting ring consisting of two Josephson junctions, a bias control line for adjusting the critical current of the SQUIDs, and a capacitor or inductance circuit component adapted to adjust coupling parameters, the DC-SQUIDs are of a planar inner loop structure, the loop comprises two Josephson junctions, two arms of the SQUIDs are mutually crossed to form 2N identical superconducting loops, namely sub-loops, and N is a positive integer; the bias control line changes the magnetic flux in the loop by applying a bias magnetic field, so that the critical current of the SQUIDs is changed, and then the frequency of the superconducting quantum coupler can be regulated and controlled. In the process of actively adjusting the frequency of the coupler, the induced current of the N sub-loops in the SQUIDs flows clockwise, and the induced current of the other N sub-loops flows anticlockwise, so that a loop is integrally formed.

There is provided a system (1) for hosting a bosonic qubit, comprising a non-linear superconducting circuit (3) and a command circuit (5). The non-linear superconducting circuit (3) comprises: at least one resonant portion (9), and an asymmetrically threaded superconducting quantum interference device (ATS) (7) coupled to said at least one resonant portion (9), wherein the ATS (7) comprises a pair of Josephson junctions and an inductive element, wherein the pair of Josephson junctions and the inductor are galvanically connected in parallel such that each of the Josephson junctions respectively forms first and second superconducting loops with the inductive element, wherein the non-linear superconducting circuit has a first physical oscillatory mode for hosting the bosonic qubit, the first physical oscillatory mode having a first resonant frequency. The command circuit (5) comprises a first electromagnetic source (27) configured to thread the first superconducting loop with a first magnetic flux Φ 1 and the second superconducting loop with a second magnetic flux Φ 2 such that the ATS (7) is threaded with a differential flux (formula I) in units of the superconducting flux quantum. The command circuit (5) is further configured to modulate the differential flux (formula II) at a modulation frequency equal to the first resonant frequency ωa.

A device comprises a superconducting switch which comprises an impedance tunable element coupled to and between a transmission line and ground. The transmission line couples a first port and a second port having matched impedances. The impedance tunable element comprises a superconducting loop comprising at least one Josephson junction, and is configured to be flux tuned into a first or second impedance state. In the first impedance state, the impedance tunable element shunts the transmission line to ground with an impedance that disrupts the impedance match between the first and second ports to suppress signal transmission between the first and second ports over the transmission line. In the second impedance state, the impedance tunable element shunts the transmission line to ground with an impedance that maintains the impedance match between the first and second ports to allow signal transmission between the first and second ports over the transmission line.

The invention discloses a field cold excitation closed-loop operation high-temperature superconducting magnet device with magnetic flux density bidirectional amplification and magnetic flux accumulation functions, and belongs to the technical field of superconducting magnet application. The high-temperature superconducting magnet device comprises a plurality of single-communication three-hole closed-loop superconducting sheet stacking units; wherein a first circular hole, a second circular hole and a third circular hole are formed in the single-communication three-hole closed-loop superconducting sheet, and slits are formed between the first circular hole and the second circular hole and between the second circular hole and the third circular hole; the single-connection three-hole closed-loop superconducting sheet is sleeved on the solenoid through the first round hole and the third round hole; and the plurality of single-communication three-hole closed-loop superconducting sheet stacking units are uniformly distributed in the circumferential direction by taking the second circular hole as the center. The device is composed of a full-superconducting loop, is simple in structure, does not need welding, a power supply and a current lead, can stably output a required high-intensity magnetic field, and is widely applied to a steady-state high-intensity magnetic field occasion.

This solves the connectivity problem between qubits. [Solution] The superconducting integrated circuit includes a first superconducting device 102 having a first superconducting loop 108 with a first superconducting trace in a first layer of the superconducting integrated circuit, and a second superconducting device 104 having a second superconducting loop 112 with a second superconducting trace in a second layer. The first superconducting loop intersects with the second superconducting loop in an intersection region 120. At least a portion of each of the first and second superconducting traces inside the intersection region follows a detour path that is narrower than at least a portion of each of the traces outside the intersection region and inductively approaches at least a portion of the other path.

The invention discloses an SQUID-based inner centering superconductive gravity measurement device and method, and belongs to the technical field of gravity measurement, the device comprises an SQUID, an input coil, a detection cavity, a superconductive suspension body, a torquer cavity, a suspension coil and a coil support base which are arranged from top to bottom; the input coil and the detection coil are in superconducting connection to form a detection loop; the detection coil induces the vertical displacement of the superconducting suspension body and converts the vertical displacement into a current signal, and the current signal is coupled to the input coil in magnetic flux coupling with the SQUID through the detection loop; the SQUID converts the magnetic flux change into a voltage signal and outputs the voltage signal, so that high-precision detection of displacement is realized; a detection coil is arranged in the detection cavity, and a torquer is arranged in the torquer cavity; different currents are introduced into the first torque superconducting loop and the second torque superconducting loop of the torquer, so that the inclination state of the superconducting suspension body is adjusted. According to the invention, the problem of poor stability of high-precision dynamic gravity measurement is effectively solved.

The invention discloses a multi-ring high-temperature superconducting permanent magnet device. The device has magnetic flux density amplification and magnetic flux accumulation functions. The device comprises a plurality of single-communication four-hole closed-loop superconducting sheet stacking units, wherein the single-communication four-hole closed-loop superconducting sheet stacking unit comprises a plurality of stacked single-communication four-hole closed-loop superconducting sheets and solenoids; a first circular hole, a second circular hole, a third circular hole and a fourth circular hole are formed in the single-communication four-hole closed-loop superconducting sheet, and slits are formed between the first circular hole and the second circular hole, between the second circular hole and the third circular hole and between the third circular hole and the fourth circular hole; the two solenoids are sleeved with the single-communication four-hole closed-loop superconducting piece through the second round hole and the third round hole respectively. And the plurality of single-communication four-hole closed-loop superconducting sheet stacking units are uniformly distributed in the circumferential direction by taking the second circular hole and the third circular hole as centers. The device is composed of a full superconducting loop, is simple in structure, does not need welding, a power supply and a current lead, can stably output a required strong magnetic field, and can also be applied to occasions such as medium and large superconducting magnets.

Provided are a structure for reducing a SQUID superconducting loop area, and a preparation method therefor, wherein a stacked structure is formed on a silicon substrate, and precision etching is performed on the stacked structure, so that a 3D nano-bridge junction is formed on a sloped surface of the stacked structure and stretches across an insulating layer, such that batch preparation of the structure for reducing a SQUID superconducting loop area can be implemented, which facilitates large-scale application of SQUID probes. The plane of the 3D nano-bridge junction is perpendicular to the plane on which a SQUID superconducting loop is located, such that the width of the 3D nano-bridge junction no longer affects a SQUID effective loop area, so that the thickness of the 3D nano-bridge junction can be individually regulated in order to improve SQUID performance, which significantly weakens the inhibition effect of a magnetic field on the superconducting characteristics of the 3D nano-bridge junction. In addition, the SQUID superconducting loop having a minimum line width of 10nm can be prepared in combination with an electron beam lithography technique having higher precision, significantly reducing the SQUID superconducting loop area, improving spin sensitivity, and thereby achieving higher spatial resolution during scanning magnetic imaging.

A method, and a corresponding system, are disclosed for measuring a direction, and optionally also a magnitude, of current in a flux qubit. The method comprises providing a probe signal to a resonator circuit having a resonance frequency. The probe signal transmits through or reflects from the resonator circuit. Further, the resonator circuit comprises a superconducting loop interrupted by a first Josephson junction and by a second Josephson junction. The first Josephson junction and second Josephson junction are connected in parallel. The superconducting loop is positioned such that it is inductively coupled to the flux qubit. The method further comprises measuring the reflected probe signal that has reflected from the resonator circuit or, respectively, measuring the transmitted probe signal that has transmitted through the resonator circuit. The method also comprises, based on a difference, such as a phase difference or amplitude difference, between the probe signal and the reflected probe signal or, respectively, between the probe signal and the transmitted probe signal, determining the direction of current in the flux qubit.

The present disclosure relates to a qubit device comprising a first superconducting loop containing one Josephson junction, and a second superconducting loop having an inductance higher than an inductance of the first superconducting loop.

The present invention is a system that produces zero noise magnetic field, which consists of: a coil made of superconducting wire, a precision current source, a Normally Closed Reed (NC) Relay, a Normally Opened (NO) Reed Relay, a cooling mechanism to maintain the superconductor temperature below the critical temperature. The precision current source generates the necessary initial current to act as source for the superconducting coil. The NO reed relay connects the precision current source to the superconductive coil. When this current start to flow, the NC Relay is used to close a superconductive path of the superconductive coil on to itself. Once the system becomes stabilized, the NO reed relay is made open, cutting off the precision source while the Normally Closed relay is closed, thereby a steady value current keeps flowing inside the superconducting coil with zero resistance and zero magnetic noise.

The application provides a magnetic field strength-plane gradient composite plane magnetic detector, and relates to a magnetic detector, which comprises a superconducting layer, a magnetoresistance layer and a soft magnetic layer. The superconducting layer is composed of two identical closed superconducting loops connected together, the two closed superconducting loops have ring holes with the same size at the centers, the two closed superconducting loops and the common area connected together each comprise a current compression structure, the magnetoresistance layer is located above the current compression structure of the superconducting layer, the soft magnetic layer is a rectangular structure, two rectangular structures are located above the superconducting layer, one rectangular structure is located below the superconducting layer, and the one rectangular structure overlaps with the two rectangular structures above the superconducting layer at the position of the ring hole of the superconducting layer. The application overcomes the problem that the existing magnetic detector cannot simultaneously measure the magnetic field strength and the magnetic field gradient in different directions, and provides a new magnetic field strength-gradient composite magnetic detector.

A superconducting circuit includes four superconducting qubits communicatively coupled by a 4-qubit even-parity stabilizer. The 4 -qubit even-parity stabilizer includes a superconducting stabilizer loop, and four inductances, each inductance inductively communicatively coupled to an inductance of a respective one of the four superconducting qubits. The 4-qubit even-parity stabilizer also includes a parity-enforcing super-conducting qubit communicatively coupled to the superconducting loop. A quantum processor comprises four Josephson parametric amplifiers communicatively coupled by a 4-qubit even-parity stabilizer. The Josephson parametric amplifiers comprise pairs of superconducting microwave resonators communicatively coupled by a compound-compound Josephson junction. The 4-qubit even-parity stabilizer includes a superconducting loop, four inductances inductively communicatively coupled to an inductance of a respective one of the four Josephson parametric amplifier, and a parity-enforcing Josephson parametric amplifier communicatively coupled to the superconducting loop.

Josephson junction based data latch devices and methods for their use are described herein. An example Josephson junction based data latch device includes a plurality of superconducting loops. Each superconducting loop includes at least one Josephson junction. Each loop of the plurality of superconducting loops is electrically coupled and is configured to shift or annihilate magnetic flux quanta in one or more of the superconducting loops in response to a combination of signals and single flux quantum (SFQ) pulses. A readout line is coupled to the plurality of superconducting loops. A plurality of data and control lines are coupled to the plurality of superconducting loops. Each line is configured to provide at least one of a plurality of signals to at least a portion of the plurality of superconducting loops. The plurality of signals includes a data signal, an enable control signal, and a read control signal.

A device comprises a first superconducting quantum bit, a second superconducting quantum bit, and a coupler circuit. The first superconducting quantum bit comprises a superconducting tunnel junction and a shunt inductor which form a first superconducting loop. The second superconducting quantum bit comprises a superconducting tunnel junction and a shunt inductor which form a second superconducting loop. The coupler circuit is coupled between the first and second superconducting quantum bits. The coupler circuit is configured to implement an entanglement gate operation between the first and second superconducting quantum bits through exchange interactions between the coupler circuit and the first superconducting quantum bit and the second superconducting quantum bit, when the coupler circuit is driven by a control signal. The coupler circuit is configured to suppress interaction between the first superconducting quantum bit and the second superconducting quantum bit, when the coupler circuit is not driven by the control signal.

The present invention relates to a quantum magnetic field detecting device comprising a two-dimensional array of superconducting loops, acting as a high- efficiency transformer-free Magnetically Small Antenna (MSA), comprising Superconducting Quantum Interference Device (SQUID) loops with Josephson junctions and bare loops without Josephson junctions.

A superconducting integrated circuit has a first superconducting device with a first superconducting loop, where the first superconducting loop has a first superconducting trace in a first layer of the superconducting integrated circuit, and a second superconducting device with a second superconducting loop, where the second superconducting loop has a second superconducting trace in a second layer. The first superconducting loop crosses the second superconducting loop in a crossing region. At least a portion of each of the first and the second superconducting trace inside the crossing region is narrower than at least a portion of each of the traces outside the crossing region, and follows a respective circuitous path which is inductively proximate to at least a portion of the other path.

A Josephson junction based crossbar device (200) includes a plurality of superconducting loops (202a-202d). Each superconducting loop includes at least one Josephson junction (204). Each loop of the plurality of superconducting loops are electrically coupled and is configured to shift or annihilate magnetic flux quanta in one or more of the superconducting loops in response to a combination of signals and single flux quantum, SFQ, pulses. A readout line (230) is additionally coupled to the plurality of superconducting loops. A plurality of data and control lines (212, 214, 216) are coupled to the plurality of superconducting loops. Each line of the plurality of data and control lines is configured to provide at least one of a plurality of signals to at least a portion of the plurality of superconducting loops. The plurality of signals includes a data signal (212), a mirrored enable control signal (214), and a strobe control signal (216).

The application provides a programmable LIF type somatic cell circuit, a superconducting neuron circuit and an electronic product. The programmable LIF type somatic cell circuit comprises a first Josephson junction, a first inductor, a first resistor and a second Josephson junction connected in series. The first Josephson junction receives a pulse signal of an input end and generates a magnetic flux quantum. When the cumulative current generated by the magnetic flux quantum and the first bias current applied to the first Josephson junction is greater than the critical current of the first Josephson junction, the first Josephson junction generates a phase flip and releases the magnetic flux quantum, and stores the magnetic flux quantum into a superconducting loop. When the cumulative current generated by the loop current and the second bias current applied to the second Josephson junction is greater than the critical current of the second Josephson junction, the second Josephson junction generates a phase flip and outputs a pulse signal. The application externally controls the threshold value of the LIF type somatic cell circuit through the bias current, can externally control the superconducting neuron circuit parameters, and has programmability.