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8169231 |
Systems, methods, and apparatus for qubit state readout
A superconducting readout system includes a computation qubit; a measurement device to measure a state of the computation qubit; and a latch qubit that mediates communicative coupling between the...
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8138784 |
Method and apparatus for controlling qubits with single flux quantum logic
In one embodiment, the disclosure relates to a method and apparatus for controlling the energy state of a qubit by bringing the qubit into and out of resonance by coupling the qubit to a flux...
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8008942 |
Analog processor comprising quantum devices
Analog processors for solving various computational problems are provided. Such analog processors comprise a plurality of quantum devices, arranged in a lattice, together with a plurality of...
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7977964 |
Single flux quantum circuits
Superconducting single flux quantum circuits are disclosed herein, each having at least one Josephson junction which will flip when the current through it exceeds a critical current. Bias current...
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7898282 |
Systems, devices, and methods for controllably coupling qubits
A system for communicably coupling between two superconducting qubits may include an rf-SQUID coupler having a loop of superconducting material interrupted by a compound Josephson junction and a...
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7868645 |
Method and apparatus for ballistic single flux quantum logic
In one embodiment, the disclosure relates to a single flux quantum (SFQ) signal transmission line powered by an AC power source. The AC power source supplies power to a transformer having a primary...
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7852106 |
Method and apparatus for ballistic single flux quantum logic
In one embodiment, the disclosure relates to a single flux quantum (SFQ) signal transmission line powered by an AC power source. The AC power source supplies power to a transformer having a primary...
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7816940 |
Ultra fast differential transimpedance digital amplifier for superconducting circuits
Supercooled electronics often use Rapid Single Flux Quantum (RSFQ) digital circuits. The output voltages from RSFQ devices are too low to be directly interfaced with semiconductor electronics, even...
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7782077 |
Method and apparatus for ballistic single flux quantum logic
In one embodiment, the disclosure relates to a single flux quantum (SFQ) signal transmission line powered by an AC power source. The AC power source supplies power to a transformer having a primary...
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7772871 |
Method and apparatus for high density superconductor circuit
The disclosure relates to a method for providing a logic circuit element. The method includes arranging a series of Josephson junctions between a first Josephson junction and a second Josephson...
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7643632 |
Ternary and multi-value digital signal scramblers, descramblers and sequence generators
Reversible and self reversing multi-value scrambling functions created by applying multi-value inverters are disclosed. The generation of possible multi-value inverters is also presented....
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7570075 |
Ultra fast differential transimpedance digital amplifier for superconducting circuits
Supercooled electronics often use Rapid Single Flux Quantum (RSFQ) digital circuits. The output voltages from RSFQ devices are too low to be directly interfaced with semiconductor electronics, even...
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7501877 |
Superconducting single flux quantum modulator circuit
Objects of the present invention are to provide an integration circuit which produces no integration leak so that the bit accuracy is improved in a sigma-delta modulation circuit or a delta...
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7378865 |
Superconducting circuit for generating pulse signal
A superconducting circuit includes a first transformer to produce a first alternating-current output at a secondary-side inductor, a second transformer to produce a second alternating-current...
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6917216 |
Superconductor output amplifier
A single flux quantum (SFQ) pulse is generated (502) by injecting a superconductor output signal as a first signal at a “start” input (108) coupled to a superconductor delay element (104). The SFQ...
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6784451 |
Multi-junction phase qubit
In one embodiment, a two-junction phase qubit includes a superconducting loop and two Josephson junctions separated by a mesoscopic island on one side and a bulk loop on another side. The material...
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6724216 |
Rapid single-flux-quantum logic circuit and rapid single-flux-quantum output conversion circuit
A rapid single-flux-quantum RSFQ logic circuit includes a first circuit portion having a first end grounded and having in-series connected first and second Josephson junctions. A second circuit...
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6486694 |
Universal delay-insensitive logic cell
The invention provides a universal, delay-insensitive RSFQ logic cell comprising two input circuits and two clock circuits, each containing a plurality of Josephson elements. The two input circuits...
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5233244 |
Josephson logic gate having a plurality of input ports and a Josephson logic circuit that uses such a Josephson logic gate
A multiple-input Josephson AND gate having a plurality of input ports comprises a plurality of Josephson logic gate elements of a number corresponding to the number of said input ports and cascaded...
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5233243 |
Superconducting push-pull flux quantum logic circuits
Push-pull flux quantum superconducting digital logic circuits are provided with a circuit branch having a pair of Josephson junctions electrically connected in series with each other. This circuit...
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5164618 |
Superconducting gate array cells
Superconducting timed gate array cells for use in single-rail logic circuits are provided by adding inputs to modified variable threshold logic (MVTL) timed inverter circuits. Data signals which...
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5124583 |
DC-powered Josephson integrated circuit
A DC powered integrated circuit includes a plurality of magnetic flux coupling type Josephson elements. First and second Josephson elements are connected in series to form a first element series...
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5051627 |
Superconducting nonhysteretic logic design
A family of logic circuits using nonhysteretic superconducting quantum interference devices (SQUIDs) connected together to perform various functions using a common operating principle. Each circuit...
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4749888 |
Josephson transmission line device
A Josephson transmission line device comprising a Josephson transmission line consisting of a pair of superconducting layers and a junction layer disposed between the superconducting layers to...
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4713562 |
Josephson-junction logic circuit
A Josephson-junction logic circuit comprises at least one Josephson-junction logic gate which has a variable threshold-type superconductive quantum interference element. The Josephson-junction...
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4672244 |
Josephson logic integrated circuit
A Josephson logic integrated circuit packaged on a single substrate, wherein a portion for delivering an output out of the integrated circuit is constructed of an A.C.-driven Josephson logic...
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4634899 |
Current injection logic device with Josephson diode network
A current injection logic device with Josephson diode network comprises three parallel branches, each having three Josephson diodes in series, the first and last diodes of each of the branches...
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4633439 |
Superconducting read-only memories or programable logic arrays having the same
An A.C. powered type logic array of very high speed operations which employs Josephson devices and which can program any desired logic. The logic array comprises a first logic array which delivers...
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4611132 |
Circuit utilizing Josephson effect
A gate circuit includes a first group of N resistors connected together at one end to form a first input terminal for receiving an input current, a second group of N-1 resistors connected in series...
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4570087 |
Josephson diode logic device
Current injection logic device with a system of Josephson diodes.This system is constituted by N parallel branches, each having a first and a second Josephson diode in series, so as to provide a...
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4555643 |
Superconducting logic circuit and superconducting switching device therefor
A superconducting logic circuit including a first power source terminal connected with a current source; a second power source terminal connected with a current sink; a first superconducting...
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4506172 |
Decoder circuit utilizing josephson devices
This invention discloses a decoder circuit utilizing Josephson devices where Josephson AND gates, output lines connecting both terminals of each said Josephson device and an input signal line are...
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4482821 |
Superconductive logic circuit
A basic logic circuit of a superconductive logic circuit comprises a bridge circuit of four branches wherein first and second terminals are connected at least at two nodes and an output terminal is...
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4413196 |
Three Josephson junction direct coupled isolation circuit
A two branch, three Josephson junction gating circuit is provided with a plurality of inputs to enable the circuit to be operated as a high-gain logic OR gate. The circuit is arranged to provide a...
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4371796 |
Josephson logic gate device
A Josephson logic gate device comprises a closed loop of four Josephson junctions, a gate line and a ground line connected to the closed loop at symmetrically opposite points, and a control line...
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4330841 |
Logic circuit with asymmetrical quantum interferometric circuits
A logic circuit having at least one asymmetrical quantum interferometric circuit, wherein the logic output states correspond to the voltage state of the asymmetrical quantum interferometric...
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4313066 |
Direct coupled nonlinear injection Josephson logic circuits
Direct coupled, nonlinear injection logic circuits having high gain, good isolation between input and output, the capability of parallel fan-in and fan-out, and which do not require a large area....
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4275314 |
Josephson Atto-Weber switch
A current-switched gate is described which comprises two Josephson tunnel junctions and a small resistor in a triangular loop. Directly combined bias and control currents flow through one junction...
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4097765 |
Electronically alterable non-latching Josephson AND, OR, NAND, NOR logic circuit
An electronically alterable logic circuit is disclosed which provides different logical outputs which are a function of control signals applied to the circuit. More specifically, a non-latching...
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4039856 |
Distributed Josephson junction logic circuit
A distributed Josephson junction logic circuit is disclosed which includes a plurality of serially disposed Josephson junctions in a superconductive wire-over-groundplane environment wherein the...
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4012642 |
Josephson junction logic element
Logic elements comprising resettable Josephson junctions cooperating with matched transmission lines have input circuit inductances connected to reversible Josephson devices which are so small that...
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3904889 |
Superconductive logic circuit utilizing Josephson tunnelling devices
A logic circuit utilizing Josephson tunnelling devices capable of providing a logical OR or NOR indication in a multi-phase time application is provided. A first current flows through a...
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3891864 |
Josephson junction logic element
Logic elements comprising resettable Josephson junctions cooperating with matched transmission lines have input circuit inductances connected to reversible Josephson devices which are so small that...
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3868515 |
Josephson device threshold gates
Threshold logic gates are provided using Josephson devices to perform the weighting and threshold functions. The input currents are provided as control currents to vary the critical switching...
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3843895 |
TWO-WAY OR CIRCUIT USING JOSEPHSON TUNNELLING TECHNOLOGY
A logical OR circuit using Josephson tunnelling devices is provided having a first, second and third gate. Each of the gates includes a first and second branch circuit in parallel. A first...
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3676718 |
SUPERCURRENT STRUCTURES UTILIZING MOBIL FLUX VORTICES
A supercurrent logic structure of extended dimensions is capable of sustaining a plurality of trapped magnetic field vortices each of which supports one flux quantum. Such a vortex prefers to...
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3458735 |
SUPERCONDUCTIVE TOTALIZER OR ANALOG-TO-DIGITAL CONVERTER
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