Abstract: 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 be coupled via a superconducting flux coupler. The ladder structure may be a chain of at least two ferromagnetically coupled ladder elements. A value for each ladder element may be less than about 1.

Abstract: 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 computation qubit and the measurement device. The latch qubit includes a qubit loop that includes at least two superconducting inductors coupled in series with each other; a compound Josephson junction that interrupts the qubit loop that includes at least two Josephson junctions coupled in series with each other in the compound Josephson junction and coupled in parallel with each other with respect to the qubit loop; and a first clock signal input structure to couple clock signals to the compound Josephson junction.

Abstract: An electronic filtering device includes continuous trace on a dielectric substrate and a dissipation layer communicatively coupled to the trace. The dissipation layer may include disconnected metal particles, which may be embedded in a substrate, for example in an epoxy. The continuous trace may be meandering, for example crenulated, coil or spiral signal path. At least a second continuous trace may be spaced from the first by the substrate, and conductively coupled by a via. The electronic filtering device may be used in one or more printed circuit boards (PCBs) that form stages of an input/output system.

Abstract: A transverse coupling system may include a first qubit, a second qubit, a first conductive path capacitively connecting the first qubit and the second qubit, a second conductive path connecting the first qubit and the second qubit, and a dc SQUID connecting the first and the second conductive paths wherein the compound junction loop is threaded by an amount of magnetic flux.

Abstract: 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.

Abstract: A method of improving the accuracy and computation time of automatic image recognition by the implementation of association graphs and a quantum processor.

Abstract: A quantum processor may employ a heterogeneous qubit-coupling architecture to reduce the average number of intermediate coupling steps that separate any two qubits in the quantum processor, while limiting the overall susceptibility to noise of the qubits. The architecture may effectively realize a small-world network where the average qubit has a low connectivity (thereby allowing it to operate substantially quantum mechanically) but each qubit is within a relatively low number of intermediate coupling steps from any other qubit. To realize such, some of the qubits may have a relatively high connectivity, and may thus operate substantially classically.

Abstract: Systems, methods and apparatus for a scalable quantum processor architecture. A quantum processor is locally programmable by providing a memory register with a signal embodying device control parameter(s), converting the signal to an analog signal; and administering the analog signal to one or more programmable devices.

Abstract: Systems, methods and articles solve queries or database problems through the use of graphs. An association graph may be formed based on a query graph and a database graph. The association graph may be solved for a clique, providing the results to a query or problem and/or an indication of a level of responsiveness of the results. Thus, unlimited relaxation of constraint may be achieved. Analog processors such as quantum processors may be used to solve for the clique.

Abstract: An architecture for a quantum processor may include a set of superconducting flux qubits operated as computation qubits and a set of superconducting flux qubits operated as latching qubits. Latching qubits may include a first closed superconducting loop with serially coupled superconducting inductors, interrupted by a split junction loop with at least two Josephson junctions; and a clock signal input structure configured to couple clock signals to the split junction loop. Flux-based superconducting shift registers may be formed from latching qubits and sets of dummy latching qubits. The devices may include clock lines to clock signals to latch the latching qubits. Thus, latching qubits may be used to program and configure computation qubits in a quantum processor.

Abstract: 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.

Abstract: An electrical filter includes a circuit board with an insulative substrate of alternating wide and narrow portions between input and output ends. Capacitors received in through-holes in the wide portions are electrically coupled to signal traces on a signal surface and ground traces on a ground surface of the circuit board. Conductive coils about narrow portions may form inductors, electrically coupled between the signal traces and an input and/or output. The circuit board, capacitors and inductors may be positioned in a first enclosure, (e.g., tube), with sealed electrical connections to an exterior. The first enclosure may be positioned in a second enclosure (e.g., tube). The filter may also include a high frequency dissipation filter section employing a metal powder filter, with metal powder and epoxy. Non-magnetic and/or superconducting materials may be employed.

Abstract: A localized area is at least partially contained within a perimeter of a shield ring formed by a closed superconducting current path of a material that is superconductive below a critical temperature. The shield ring is at least partially within a perimeter of a compensation coil that is coupled to a current source. One or more measurement devices are responsive to magnetic fields in the vicinity of the localized area, allowing compensation by controlling current to the compensation coil. A heater can raise temperature of the shield ring out of a superconducting condition.

Abstract: Approaches to embedding source graphs into targets graphs in a computing system are disclosed. Such may be advantageously facilitate computation with computing systems that employ one or more analog processors, for example one or more quantum processors.

Abstract: A structure comprising (i) a first information device, (ii) a second information device, (iii) a first coupling element and (iv) a second coupling element is provided. The first information device has at least a first lobe and a second lobe that are in electrical communication with each other. The second information device and has at least a first lobe and a second lobe that are in electrical communication with each other. The first coupling element inductively couples the first lobe of the first information device to the first lobe of the second information device. The second coupling element inductively couples the first lobe of the first information device to the second lobe of the second information device.

Abstract: Multiple substrates that carry quantum devices are coupled to provide quantum mechanical communicators therebetween, for example, using superconducting interconnects, vias, solder and/or magnetic flux. Such may advantageously reduce a footprint of a device such as a quantum processor.

Abstract: Quantum annealing may include applying and gradually removing disorder terms to qubits of a quantum processor, for example superconducting flux qubits of a superconducting quantum processor. A problem Hamiltonian may be established by applying control signals to the qubits, an evolution Hamiltonian established by applying disorder terms, and annealing by gradually removing the disorder terms. Change in persistent current in the qubits may be compensated. Multipliers may mediate coupling between various qubits and a global signal line, for example by applying respective scaling factors. Two global signal lines may be arranged in an interdigitated pattern to couple to respective qubits of a communicatively coupled pair of qubits. Pairs of qubits may be communicatively isolated and used to measure a response of one another to defined signals.

Abstract: 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 first magnetic flux inductor configured to controllably couple to the compound Josephson junction. The loop of superconducting material may be positioned with respect to a first qubit and a second qubit to provide respective mutual inductance coupling therebetween. The coupling system may be configured to provide ferromagnetic coupling, anti-ferromagnetic coupling, and/or zero coupling between the first and second qubits. The rf-SQUID coupler may be configured such that there is about zero persistent current circulating in the loop of superconducting material during operation.

Abstract: Methods, systems and apparatus for quasi-adiabatic quantum computation include initializing a quantum processor to a ground state of an initial Hamiltonian and evolving the quantum processor from the initial Hamiltonian to a final Hamiltonian via an evolution Hamiltonian, wherein anti-crossings of the evolution Hamiltonian are passed non-adiabatically.

Abstract: 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 coupling systems and two or more qubits. A method may include providing first, second and third coupling structure to control the coupling system.