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| Number | Title | Issue Date |
| 8174305 | System, devices and methods for coupling qubits A ladder structure is ferromagnetically coupled to a first qubit where the ladder structure has a monostable energy potential in use, such that the first qubit and the ladder structure effectively operate as a single qubit. The ladder structure and first qubit may b... | 05/08/2012 |
| 7880529 | Systems, devices, and methods for controllably coupling qubits A coupling system may include first and second magnetic flux inductors communicatively coupled to a Josephson junction of an rf SQUID. The coupling system may allow transverse coupling between qubits. A superconducting processor may include at least one of the coupl... | 02/01/2011 |
| 7847615 | Quantum bit variable coupling method, quantum computing circuit using the method, and variable coupler In a quantum computing circuit forming a superconductive loop including a plurality of Josephson junctions, first and second superconductive magnetic flux quantum bit element (101, 102) are biased at a half-quantum magnetic flux, and have mutually different c... | 12/07/2010 |
| 7372327 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 05/13/2008 |
| 7365663 | Flux-quantizing superconducting analog to digital converter (ADC) A superconducting analog-to-digital converter includes a superconducting input loop to which is applied an analog voltage to be converted to a digital format. The superconducting loop includes two Josephson junctions for converting said analog input voltage into a s... | 04/29/2008 |
| 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 |
| 7253701 | Multiplexed amplifier Multiple sensor signals are used to modulate an equal number of frequency-spaced carrier signals in a directional parametric upconverting amplifier. Basically, the carrier signals are separated in a cascaded or parallel configuration of narrow frequency passbands, w... | 08/07/2007 |
| 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 |
| 7233199 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/19/2007 |
| 7161427 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 01/09/2007 |
| 7129870 | Superconducting latch driver circuit generating sufficient output voltage and pulse-width A circuit includes a latch circuit including a Josephson junction and configured to perform a latch operation based on a hysteresis characteristic in response to a single flux quantum, a load circuit including load inductance and load resistance and coupled to an ou... | 10/31/2006 |
| 7095227 | Superconducting driver circuit To obtain a superconducting driver circuit which can obtain an output voltage of several millvolts or above, can use a DC power source as a driving power source, can form no capacitance between it and a ground plane, and has a small occupation area, the superconduct... | 08/22/2006 |
| 7064605 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/20/2006 |
| 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 |
| 6960929 | Superconductive crossbar switch A superconductor crossbar switch for connecting a plurality of inputs with a plurality of outputs, including a switching cell having an input, an output and a circuit for connecting the input with the output for bidirectionally transmitting data therebetween. The co... | 11/01/2005 |
| 6949970 | Voltage standard apparatus A programmable voltage standard element which consists of Josephson junction arrays having Josephson junction devices which are connected in series generates constant voltage by impression of bias current and microwave. The voltage standard element has bias c... | 09/27/2005 |
| 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 |
| 6839578 | Method of forming high temperature superconducting Josephson junction A method of forming a novel high temperature superconducting Josephson junction which is capable of achieving a formation of a Josephson junction having high characteristics conveniently and quickly without necessitating costly micromachining facilities. Two high te... | 01/04/2005 |
| 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 |
| 6580310 | Double flux quantum superconductor driver A rapid SFQ one-way buffer (13, 1, 4, 5, 15, 2 & 9), is combined with a Josephson transmission line (17,3, 19, 16, 21 & 4) that is lightly loaded (RL) to provide a superconductor driver capable of producing double flux quantum output pulses. Ea... | 06/17/2003 |
| 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 |
| 6512368 | Dewar and biological magnetism measurement apparatus using the dewar A dewar for SQUID is provided. In the dewar for SQUID, an amount of leak gas discharged from absorbent arranged in the upper portion higher than the liquid surface level of liquid helium is small even if the liquid surface level of the liquid helium is lo... | 01/28/2003 |
| 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 |
| 6331805 | On-chip long Josephson junction (LJJ) clock technology One aspect of the invention is directed to on-chip high-frequency, low-jitter clock circuits including long Josephson junction (LJJ) oscillators usable as clock sources. LJJ oscillators embodying the invention may be formed using either "linear" or "annul... | 12/18/2001 |
| 6005380 | Sensitive slot antenna including inductively coupled squid array A magnetic field sensor which can be used as an active antenna is disclosed that is capable of small size, ultrawideband operation, and high efficiency. The sensor includes a multiplicity of magnetic field transducers, e.g., superconducting quantum interf... | 12/21/1999 |
| 5936458 | Superconducting analog amplifier circuits Josephson transmission structures (JTSs) which include Josephson transmission lines (JTLs) with filter circuitry and flux release circuitry. Two or more of these JTSs may be interconnected to form a superconducting high-gain operational amplifier intended... | 08/10/1999 |
| 5844407 | Method using squid array for improving the sensitivity of a slot antenna A magnetic field sensor which can be used as an active antenna is disclosed that is capable of small size, ultrawideband operation, and high efficiency. The sensor includes a multiplicity of magnetic field transducers, e.g., superconducting quantum interf... | 12/01/1998 |
| 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 |
| 5757243 | High frequency system including a superconductive device and temperature controlling apparatus An effective high frequency oscillator is made of a plurality of Josephson devices. A high frequency converter as a high frequency circuit is made of the high frequency oscillator, nonlinear superconductor devices, and transmission line. Josephson devices... | 05/26/1998 |
| 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 |
| 5424641 | SQUID fluxmeter having a pulse mulliplication circuit number for accurately measuring large rates of change in flux A SQUID fluxmeter, which object is to accurately measure magnetic flux even if the input magnetic flux is largely changed in a short time, includes an 1-input superconducting OR gate for outputting pulses to the number of i in response to one input pulse ... | 06/13/1995 |
| 5420100 | Planar squid magnetometer with inductively coupled microstrip resonator A planar SQUID magnetometer for detection and measurement of an applied magnetic flux is disclosed wherein a planar microwave-resonant element overlaps a Josephson device incorporated in a high-Tc superconducting, thin-film SQUID device, thereb... | 05/30/1995 |
| 5378999 | Hybrid matrix amplifier The present invention comprises a novel matrix amplifier. The matrix amplifier includes an active superconducting power divider (ASPD) having N output ports; N distributed amplifiers each operatively connected to one of the N output ports of the ASPD; and... | 01/03/1995 |
| 5334884 | Three junction squid mixer A three junction SQUID (superconducting quantum interference device) mixer circuit is disclosed wherein a nonlinear element such as a Josephson junction is coupled with a dc SQUID formed by two other nonlinear elements such as Josephson junctions and two ... | 08/02/1994 |
| 5331297 | Josephson device a.c. power supply circuit and circuit substrate for mounting same An impedance-matching circuit assembly supplies a.c. power from an external a.c. source to Josephson devices. The assembly comprises resonant-line composed quarter-wave impedance conversion circuits, interconnected in a tree. The impedance-conversion circ... | 07/19/1994 |
| 5315180 | Synchronizing interface circuit between semiconductor element circuit and a Josephson junction element circuit In an interface circuit transferring a data signal from a semiconductor element circuit to a Josephson junction element circuit, a first unit detects a change switching of a first clock signal supplied from the semiconductor element circuit, and generates... | 05/24/1994 |
| 5295093 | Polarity-convertible Josephson driver circuit A polarity-convertible Josephson driver circuit includes first and second driving voltage generating circuits, a driven line, and a load resistor. Each of the first and second driving voltage generating circuits has a loop circuit for forming at least one... | 03/15/1994 |
| 5287057 | Superconducting circuit having a rectifier for converting a bipolar signal to a unipolar signal A superconducting circuit system comprises a biasing circuit for producing a bias current that changes periodically, and a superconducting rectifier circuit driven by the bias current. The superconducting rectifier circuit is supplied with a first pulse t... | 02/15/1994 |
| 5266844 | Timing discriminator circuit and method for determining the arrival order of input signals The present invention is directed to systems and methods capable of analyzing a wide variety of input signal waveforms to arbitrate their arrival sequence with a high resolution. In an exemplary embodiment, the apparatus is an arbiter circuit which includ... | 11/30/1993 |
