126results about "Pulse generation by super conductive devices" patented technology

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 coupling devices. The analog processors further comprise bias control systems each configured to apply a local effective bias on a corresponding quantum device. A set of coupling devices in the plurality of coupling devices is configured to couple nearest-neighbor quantum devices in the lattice. Another set of coupling devices is configured to couple next-nearest neighbor quantum devices. The analog processors further comprise a plurality of coupling control systems each configured to tune the coupling value of a corresponding coupling device in the plurality of coupling devices to a coupling. Such quantum processors further comprise a set of readout devices each configured to measure the information from a corresponding quantum device in the plurality of quantum devices.

A superconducting flux digital-to-analog converter includes a superconducting inductor ladder circuit. The ladder circuit includes a plurality of closed superconducting current paths that each includes at least two superconducting inductors coupled in series to form a respective superconducting loop, successively adjacent or neighboring superconducting loops are connected in parallel with each other and share at least one of the superconducting inductors to form a flux divider network. A data signal input structure provides a respective bit of a multiple bit signal to each of the superconducting loops. The data signal input structure may include a set of superconducting quantum interference devices (SQUIDs). The data signal input structure may include a superconducting shift register, for example a single-flux quantum (SFQ) shift register or a flux-based superconducting shift register comprising a number of latching qubits.

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 defines a different island. An ancillary device is coupled to the first qubit. In a first example, the ancillary device is a readout mechanism respectively capacitively coupled to a first and second island in the plurality of islands of the first qubit by a first and second capacitance. Quantum nondemolition measurement of the first qubit's state may be performed. In a second example, the ancillary device is a second qubit. The second qubit's first and second islands are respectively capacitively coupled to the first and second islands of the first qubit by a capacitance. In this second example, the coupling is diagonal in the physical basis of the qubits.

Systems and methods for reading out the states of superconducting flux qubits may couple magnetic flux representative of a qubit state to a DC-SQUID in a variable transformer circuit. The DC-SQUID is electrically coupled in parallel with a primary inductor such that a time-varying (e.g., AC) drive current is divided between the DC-SQUID and the primary inductor in a ratio that is dependent on the qubit state. The primary inductor is inductively coupled to a secondary inductor to provide a time-varying (e.g., AC) output signal indicative of the qubit state without causing the DC-SQUID to switch into a voltage state. Coupling between the superconducting flux qubit and the DC-SQUID may be mediated by a routing system including a plurality of latching qubits. Multiple superconducting flux qubits may be coupled to the same routing system so that a single variable transformer circuit may be used to measure the states of multiple qubits.

A superconducting logic cell includes at least one quantum phase-slip junction (QPSJ) for receiving at least one input and responsively providing at least one output, each QPSJ being configured such that when an input voltage of an input voltage pulse exceeds a critical value, a quantized charge of a Cooper electron pair tunnels across said QPSJ as an output, when the input voltage is less than the critical value, no quantized charge of the Cooper electron pair tunnels across said QPSJ as the output, where the presence and absence of the quantized charge in the form of a constant area current pulse in the output form two logic states, and the at least one QPSJ is biased with a bias voltage. The superconducting logic cell further includes at least one Josephson junction (JJ) coupled with the at least one QPSJ to perform one or more logic operations.

An on-chip Josephson parametric converter is provided. The on-chip Josephson parametric converter includes a Josephson ring modulator. The on-chip Josephson parametric converter further includes a lossless power divider, coupled to the Josephson ring modulator, having a single input port and two output ports for receiving a pump drive signal via the single input port, splitting the pump drive signal symmetrically into two signals that are equal in amplitude and phase, and outputting each of the two signals from a respective one of the two output ports. The pump drive signal excites a common mode of the on-chip Josephson parametric converter.

A control system architecture for quantum computing includes an array of qubits, which is divided into a plurality of sub-arrays based on a first direction and a second direction, the second direction intersecting the first direction, a plurality of control lines each coupled to a corresponding sub-array of qubits in the first direction, a plurality of enable / unenable lines each coupled to a corresponding sub-array of qubits in the second direction, a controls signal source that generates a control signal, wherein the control lines are used to apply the control signal commonly to one or more sub-arrays of qubits in the first direction, an enable / unenable signal source that generates a enable signal, wherein the enable / unenable lines are used to apply the enable signal independently to the corresponding sub-array of qubits in the second direction to set a bias point of each qubit of the corresponding sub-array of qubits in the second direction between a first position, in which the qubit is unenabled and not responsive to the control signal, and a second position, in which the qubit is enabled and responsive to the control signal.

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 output of the latch circuit, and a reset circuit provided between the output of the latch circuit and the load circuit and configured to reset the latch circuit a predetermined time after the latch operation by the latch circuit, wherein the Josephson junction is driven by a direct current.

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 superconducting driver circuit is constructed by superconducting flux quantum interference devices (SQUIDs) each constructing a closed loop having as components two superconducting junctions and an inductor. The SQUIDs share the inductors and are connected in series in three or more stages.

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 defines a different island. An ancillary device is coupled to the first qubit. In a first example, the ancillary device is a readout mechanism respectively capacitively coupled to a first and second island in the plurality of islands of the first qubit by a first and second capacitance. Quantum nondemolition measurement of the first qubit's state may be performed. In a second example, the ancillary device is a second qubit. The second qubit's first and second islands are respectively capacitively coupled to the first and second islands of the first qubit by a capacitance. In this second example, the coupling is diagonal in the physical basis of the qubits.