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| Number | Title | Issue Date |
| 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 modulator circuit, which is based on a single flux quantum circuit that uses... | 03/10/2009 |
| 7443720 | Method and circuit for reading quantum state A single electron-transistor is used to read out charge states of two coupled qubits formed by two Cooper pair boxes. Detection is made about a gate voltage shift of the peak of the current that flows in the single electron transistor in accordance with the charge s... | 10/28/2008 |
| 7268576 | Superconducting qubit with a plurality of capacitive couplings A first qubit having a superconducting loop interrupted by a plurality of Josephson junctions is provided. Each junction interrupts a different portion of the superconducting loop and each different adjacent pair of junctions in the plurality of Josephson junctions ... | 09/11/2007 |
| 7253654 | Superconducting qubits having a plurality of capacitive couplings A first qubit having a superconducting loop interrupted by a plurality of Josephson junctions is provided. Each junction interrupts a different portion of the superconducting loop and each different adjacent pair of junctions in the plurality of Josephson junctions ... | 08/07/2007 |
| 7247603 | Charge dissipative dielectric for cryogenic devices A Superconducting Quantum Interference Device (SQUID) is disclosed comprising a pair of resistively shunted Josephson junctions connected in parallel within a superconducting loop and biased by an external direct current (dc) source. The SQUID comprises a semiconduc... | 07/24/2007 |
| 7227480 | Current steering type single flux quantum circuit Disclosed is a single flux quantum circuit that uses a flux quantum as an information carrier, which generates a SFQ clock signal with little clock jitter and supplies the SFQ clock signal to a SFQ function circuit of the SFQ circuit, the SFQ function circuit is con... | 06/05/2007 |
| 7170960 | Instantaneous clock recovery circuit A clock recovery circuit (10) for a superconductor system that enables the phase of a system clock to be instantaneously reset without any pulse interaction. The clock recovery circuit (10) includes a Josephson transmission line oscillator loop (14 | 01/30/2007 |
| 7038604 | Superconducting multi-stage sigma-delta modulator There is provided a superconducting multi-stage sigma-delta modulator including a first superconducting sigma-delta modulator having a first integrator and a first comparator and outputting a sigma-delta modulated signal and a second superconducting sigma-delta modu... | 05/02/2006 |
| 7002366 | Superconducting constant current source An on-chip current regulator for a superconducting logic circuit isolates the superconducting logic circuit from external noise, reduces the effects of process fluctuations on the performance of the logic circuit and significantly reduces total circuit power require... | 02/21/2006 |
| 6922066 | Sampler and method of measuring a waveform of a current with jitters reduced In a sampler for use in measuring a waveform of an electric signal, a measurement target current is given as the electric signal to a sampler chip 11 and is also used to produce a trigger current Itr for determining measurement timing on the sampler chip. A c... | 07/26/2005 |
| 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 pulse is reflected (504) back and for... | 07/12/2005 |
| 6608518 | Superconducting single flux quantum circuit The problem of the disclosed technology is as follows. Although a single flux quantum circuit can fabricate a high-speed sequential circuit with ease, the initialization of the circuit is required for guaranteeing the normal operation of the circuit. Howe... | 08/19/2003 |
| 6549059 | Underdamped Josephson transmission line A Josephson junction transmission line (50) for transmitting single flux quantum pulses. The transmission line (50) includes a current source (53), a plurality of isolation inductors (52, 54) electrically coupled in series along the transmission line (50)... | 04/15/2003 |
| 6507234 | Active timing arbitration in superconductor digital circuits A superconductor circuit (50) for providing active timing arbitration between SFQ pulses. The superconductor circuit (50) includes a first superconducting transmission line (52) having at least one inductor (54) for transmitting first input pulses, and a ... | 01/14/2003 |
| 6310488 | Superconductive single flux quantum logic circuit In a superconductive single flux quantum logic circuit having two superconductive closed loops each comprising a Josephson junction and one or more inductors, a load inductance part is comprised of an inductor and a Josephson junction and two or more mean... | 10/30/2001 |
| 6294946 | Switching circuit with intermittently loaded charged capacitance A switching circuit, comprising: a first node for receiving a first voltage; a second node 502 for providing an output; a third node for receiving a second voltage; a capacitance 506 coupled between the second node 502 and the third node; means for interm... | 09/25/2001 |
| 6229332 | Superconductive logic gate and random access memory The present invention is a superconductive logic gate assembly (50, 100), a superconductive NOR gate assembly (10), and a superconductive random access memory (150). A superconductive logic gate assembly in accordance with the invention includes a plurali... | 05/08/2001 |
| 6154044 | Superconductive logic gate and random access memory The present invention is a superconductive logic gate assembly (50, 100), a superconductive NOR gate assembly (10), and a superconductive random access memory (150). A superconductive logic gate assembly in accordance with the invention includes a plurali... | 11/28/2000 |
| 6087884 | Bifrequency output device There is disclosed a bifrequency output device. The bifrequency output device comprises Josephson junctions, a resistor for generating a given voltage in response to a pulse current which is supplied from the outside, and a time delay element for delaying... | 07/11/2000 |
| 5982219 | Asynchronous dual-rail demultiplexer employing Josephson junctions A circuit embodying the invention includes two toggle flip-flops formed using Josephson junctions sharing a common inductive element. One flip-flop is responsive to "zero" input signals (IN$c;) and the other flip-flop is responsive to "one" input signa... | 11/09/1999 |
| 5959483 | Method for amplifying voltage in Josephon junction The present invention discloses a method for amplifying voltage to which a test will be given in Josephon junction having external current, and more particularly, to a method for amplifying voltage in Josephon junction in which the voltage in a simple Jos... | 09/28/1999 |
| 5831278 | Three-terminal devices with wide Josephson junctions and asymmetric control lines A three-terminal device constructed from a Josephson junction with one or more asymmetric control lines is disclosed. The device is constructed with high temperature superconducting materials. The junction can be a bicrystal, SNS (Superconducting-Normal-S... | 11/03/1998 |
| 5574369 | Detection and communications device employing stochastic resonance A sensitive detector and detector system with multi-state element or elements employing the phenomenon of stochastic resonance to enhance signal-to-noise ratio (SNR) and detector sensitivity. Signal output is enhanced by the addition of external noise at ... | 11/12/1996 |
| 5552735 | Multi-gigahertz single flux quantum switch A switch for controlling the throughput of a signal between a pair of input channels and a pair of output channels is provided which receives an input signal from each of the pair of input channels. The switch transmits an output signal to each of the pai... | 09/03/1996 |
| 5479131 | Squid array voltage standard A Josephson junction voltage standard based on rf controlled dc SQUID's is proposed. A microwave signal is injected using rf control lines. A D/A converter based on series-connected rf controlled SQUID's is described.... | 12/26/1995 |
| 5455519 | Josephson logic circuit A Josephson logic circuit includes a Josephson element inserted between an input terminal and a reference electric potential such as ground, a resistor inserted between the input terminal and an input of the next stage of the Josephson circuit, and a curr... | 10/03/1995 |
| 5424656 | Continuous superconductor to semiconductor converter circuit Apparatus for converting superconductor low level signals to semiconductor signal levels utilizing a continuous superconductor to semiconductor converter circuit biased for maximum gain and without the need for a clocked reset signal. Employing a unique b... | 06/13/1995 |
| 5336941 | Superconducting circuit and method for driving the same According to the present invention, there is provided a superconducting circuit including a Josephson tunnel junction 1 and a load resistor 2 connected in parallel to the Josephson tunnel junction, in which a current source 5 is connected to the input ter... | 08/09/1994 |
| 4902908 | Superconducting circuit A superconducting circuit comprises a quantum flux parametron. In the superconducting circuit, at least one of two Josephson devices is a voltage controlled superconducting device, the critical current of which can be controlled by applying a voltage. By ... | 02/20/1990 |
| 4888622 | Superconductor electron device A superconducting electron device is disclosed, in which a pair of parallel superconducting channels each having a Josephson junction therein are provided between source and drain electrodes, and a gate electrode is provided to apply a voltage to the chan... | 12/19/1989 |
| 4847514 | Light-actuated superconducting integrated circuit device A superconducting integrated circuit device switches the state of a Josephson junction element in response to incident light by diverting a current to a superconducting control signal line from a superconducting control signal extracting line. The control... | 07/11/1989 |
| 4626701 | Rectifying circuit comprising a superconductive device A rectifying circuit includes a superconductive device and a circuit which controls a magnetic field to be applied to the superconductive device in response to the phase of an A.C. signal applied to the superconductive device, the state of the superconduc... | 12/02/1986 |
| 4603265 | Josephson device A Josephson device applicable to a down-edge detecting circuit and to a sense circuit comprises a first gate circuit and a second gate circuit each incorporating Josephson junctions, with an input line of the first gate circuit and a first input line of t... | 07/29/1986 |
| 4533840 | Soliton sampler The invention is an all-soliton sampler for accessing very high speed circuits. A soliton is switched in two parallel branches, one including the device-under-test and the other including a programmable delay line implemented in soliton devices. The outpu... | 08/06/1985 |
| 4459495 | Josephson current regulator A Josephson current regulator circuit is described for regulating the gate current to a Josephson load device. The regulator circuit is located between the source of the gate current and the Josephson load, and is comprised of Josephson devices having a c... | 07/10/1984 |
| 4458160 | High gain Josephson junction voltage amplifier A single Josephson junction device is arranged in a single branch which comprises an external source resistor connected in series with an output resistor and a Josephson junction device. An input node and an input resistor are in series and connected to t... | 07/03/1984 |
| 4401900 | Ultra high resolution Josephson sampling technique A circuit is provided for sampling and accurately reproducing unknown signals with picosecond resolution, which could be electrical, optical, X-ray, gamma ray, or particle signals. The circuit comprises a superconductive monitor gate having at least two s... | 08/30/1983 |
| 4400631 | High current gain Josephson junction circuit A superconductive circuit is described for diverting bias current to an output line in response to magnetic field control means. A first plurality of branches containing magnetically switchable Josephson junction gates are connected in parallel, and a sec... | 08/23/1983 |
| 4361768 | Superconducting soliton devices Josephson solitons are steered along selected paths in response to applied control signals, the output path chosen being dependent solely upon the presence and absence of these control signals. An input Josephson transmission line is provided along which ... | 11/30/1982 |
| 4342924 | Nonhysteretic Josephson junction circuits with feedback The transfer characteristic of nonhysteretic Josephson junction gates (G) is sharpened and desired switching behavior free from resetting requirements is achieved by a positive feedback scheme (FIGS. 5, 8-9) in which the gate is made to be responsive to c... | 08/03/1982 |
