Duke University

Bichen Zhang

Kenneth Brown

Mingyu Kang

Pak Hong Leung

Shilin Huang

Qiyao Liang

The present disclosure describes techniques for optimizing two-qubit gates performance in a quantum circuit of a quantum computing system. A quantum computing system selects, from qubits in the quantum circuit, a pair of target qubits on which to perform a quantum gate operation. The quantum computing system selects, from the plurality of qubits, a second plurality of qubits on which to introduce an intentional noise. The intentional noise is applied to the second plurality of qubits via a numerical optimizer. An optimized frequency is determined based on the applied intentional noise. The quantum gate operation is performed by modifying the pair of target qubits frequency to the optimized frequency.

Implementation of batch optimization for robust two-qubit gates for quantum computation

A system includes a controller configured to reconstitute a continuous waveform to a discrete analogue version. The system includes a numerical optimizer configured to determine frequencies of a pulse sequence. The numerical optimizer uses radial motional mode frequencies and a desired gate time. The numerical optimizer generates the pulse sequence by closing phase-space trajectories, disentangling spins and motions, and constraining a Rabi frequency for motional sideband transitions. The system also includes a display configured to illustrate a discrete frequency modulation pulse sequence based on the determined frequencies.

Growing community of inventors

Durham, NC, United States of America

Bichen Zhang