Wisconsin Alumni Research Foundation

University System of Maryland

University of Massachusetts

Universitaet Des Saarlandes

Maxim George Vavilov

Robert Francis McDermott

Vladimir Manucharyan

Luke Colin Gene Govia

Ivan Pechenezhskiy

Emily Joy Pritchett

Frank Karsten Wilhelm-Mauch

Kangbo Li

Chen Wang

Konstantin Nesterov

Britton Louis Thomas Plourde

A system and method for controlling superconducting qubits is provided. In some aspects the method includes assembling, using a controller of a quantum computing system, a pulse subsequence that comprises pairs of voltage pulses timed symmetrically with respect to a period corresponding to a qubit frequency of a superconducting qubit in the quantum computing system. The method also includes generating, using the controller, a pulse sequence using a repetition of a pulse subsequence. The method further includes controlling the superconducting qubit by applying the pulse sequence to the superconducting qubit using a single flux quantum ('SFQ') driver coupled thereto.

System and method for controlling superconducting qubits using single flux quantum logic

A system and method for controlling qubits to perform quantum computation is provided. In some aspects, the system includes at least one superconducting quantum processor comprising a multi-qubit architecture having coupled qubits that are described by an anharmonic energy spectrum. The system also includes a microwave source connected to the at least one superconducting quantum processor, and configured to provide a microwave irradiation to at least one of the coupled qubits in the multi-qubit architecture to perform a gate on the at least one of the coupled qubits. The system further includes a controller configured to direct the microwave source to provide the microwave irradiation to at least one of the coupled qubits in the multi-qubit architecture.

System and method for controlling superconducting qubits

A system for quantum computation and a readout method using the same are provided. In some aspects, the system includes at least one qubit circuit coupled to a resonant cavity, wherein each of the at least one qubit circuit is described by multiple quantum states, and a controller configured to provide microwave irradiation to the resonant cavity such that a quantum state information of the at least one qubit circuit is transferred to a resonant cavity occupation. The system also includes a readout circuit, coupled to the resonant cavity, configured to receive signals corresponding to the resonant cavity occupation, and generate an output indicative of the quantum states of the at least one qubit circuit. Optionally, the system further includes at least one single flux quantum ('SFQ') circuit coupled to the readout circuit and configured to receive the output therefrom.

System and method for circuit quantum electrodynamics measurement

A system and methods for controlling superconducting quantum circuits are provided. The system includes at least one superconducting quantum circuit described by multiple quantum states, and at least one single flux quantum ('SFQ') control circuit configured to generate a voltage pulse sequence that includes a plurality of voltage pulses temporally separated by a pulse-to-pulse spacing timed to a resonance period. The system also includes at least one coupling between the at least one superconducting quantum circuit and the at least one SFQ control circuit configured to transmit the voltage pulse sequence generated using the SFQ control circuit to the at least one superconducting quantum circuit. In some aspects, the system further includes a controller system configured to optimize the pulse-to-pulse spacing to minimize a gate infidelity due to at least one of a timing error, a timing jitter and a weak qubit anharmonicity.

System and method for controlling superconducting quantum circuits using single flux quantum logic circuits

Growing community of inventors

Middleton, WI, United States of America

Maxim George Vavilov