Superconducting tunnel junctions for use in, for instance, quantum processors. In one example, a quantum processor can have at least one qubit structure. The at least one qubit structure includes a first aluminum layer, a second aluminum layer, and a crystalline dielectric layer disposed between the first aluminum layer and the second aluminum layer. The crystalline dielectric layer includes a spinel crystal structure.

This disclosure relates to an optical device comprising: a first filter waveguide section having an input for receiving a pump signal, the first filter waveguide section further having an output; an emitter waveguide section having an input coupled to the output of the first filter waveguide section to receive a transmitted pump signal therefrom, the emitter waveguide section supporting at least a first guided lower-order optical mode and a second guided higher-order optical mode, the emitter waveguide section comprising a photon emitter coupled to the first guided mode to emit radiation into the first guided mode and coupled to the second guided mode to allow optical pumping of the photon emitter by pump signal power carried in the second guided mode, the emitter waveguide section further having an output for outputting radiation emitted from the photon emitter; a second filter waveguide section having an input coupled to the output of the emitter waveguide section and having an output, the second filter waveguide section being configured to transmit radiation emitted into the first guided mode with lower loss than radiation emitted into modes other than the first guided mode; the first filter waveguide section being configured to couple pump signal power predominantly into the second guided mode of the emitter section.

A quantum bit including a quantum dot may in particular include an NV center. A nuclear quantum bit includes at least one nuclear quantum dot, which is typically a nuclear spin afflicted isotope. The quantum dot and nuclear quantum dot include a device for controlling the quantum dot and nuclear quantum dot. Compounded therefrom, a quantum register includes at least two quantum bits, and a nuclear quantum register includes at least two nuclear quantum bits. A nucleus-electron quantum register includes one quantum bit and one nuclear quantum bit, and a nucleus-electron-nucleus-electron quantum register includes at least one quantum register and at least two nucleus-electron registers. A higher-level structure, a quantum bus, for transporting a quantum information and a quantum computer composed thereof are part of the disclosure. Also included are methods necessary to fabricate and operate the device.

Systems and methods for calibrating a qubit parameter for a qubit in a quantum computing system are provided. In one example, a method includes obtaining, by one or more computing devices, data associated with a set of one or more qubit parameters for a qubit in a quantum computing system. The method includes obtaining, by the one or more computing devices, calibration data associated with at least one qubit parameter in the set of one or more qubit parameters. The method includes determining, by the one or more computing devices, a value for the at least one qubit parameter based at least in part on the calibration data using a de-corrupting autoencoder.

A quantum error correcting code with dynamically generated logical qubits is provided. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, the measurement patterns generate logical qubits, allowing the code to act as a fault-tolerant quantum memory. Each measurement can be a two-qubit Pauli measurement.

A quantum error correcting code with dynamically generated logical qubits is provided. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, the measurement patterns generate logical qubits, allowing the code to act as a fault-tolerant quantum memory. Each measurement can be a two-qubit Pauli measurement.

An ising solver system that searches an optimal route of a vehicle from plural routes passing through plural locations. In the ising solver system, the search of the optimal route uses a Hamiltonian. The Hamiltonian includes an equation representing an interaction between Quadratic Unconstrained Binary Optimization (QUBO) variables depending on a relation between a departure location and an arrival location or capacitated variable of the ising solver. The capacitated variable corresponds to one of the QUOBO variables and includes a variable constraint, and the location-to-location travel step number corresponds to an accumulated movement time of the vehicle.

An ising solver system that searches an optimal route of a vehicle from plural routes passing through plural locations. In the ising solver system, the search of the optimal route uses a Hamiltonian. The Hamiltonian includes an equation representing an interaction between Quadratic Unconstrained Binary Optimization (QUBO) variables depending on a relation between a departure location and an arrival location or capacitated variable of the ising solver. The capacitated variable corresponds to one of the QUOBO variables and includes a variable constraint, and the location-to-location travel step number corresponds to an accumulated movement time of the vehicle.

A method, apparatus, system, and computer program product for quantum processing. A target quantum programming for a process for a quantum computer is identified. A universal gate set is selected based on a computer type. Any operation possible for a particular quantum computer can be performed using the universal gate set. Instructions for the process in a source quantum programming language are sent to a source quantum language translator which outputs a digital model representation of quantum computer components that are arranged to perform the process using the instructions. The digital model representation of the quantum computer components and the universal gate set are sent to a target quantum language translator, which outputs the instructions for operations for the process in a target quantum programming language using the digital model representation of the quantum computer components and the universal gate set for the computer type for the quantum computer.

A method, apparatus, system, and computer program product for quantum processing. A target quantum programming for a process for a quantum computer is identified. A universal gate set is selected based on a computer type. Any operation possible for a particular quantum computer can be performed using the universal gate set. Instructions for the process in a source quantum programming language are sent to a source quantum language translator which outputs a digital model representation of quantum computer components that are arranged to perform the process using the instructions. The digital model representation of the quantum computer components and the universal gate set are sent to a target quantum language translator, which outputs the instructions for operations for the process in a target quantum programming language using the digital model representation of the quantum computer components and the universal gate set for the computer type for the quantum computer.