US 12,229,635 B2
Fidelity estimation for quantum computing systems
John Martinis, Santa Barbara, CA (US); Nan Ding, Los Angeles, CA (US); Ryan Babbush, Venice, CA (US); Sergei V. Isakov, Zürich (CH); Hartmut Neven, Malibu, CA (US); Vadim Smelyanskiy, Mountain View, CA (US); and Sergio Boixo Castrillo, Rancho Palos Verdes, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Filed by Google LLC, Mountain View, CA (US)
Filed on Jan. 12, 2022, as Appl. No. 17/574,192.
Application 17/574,192 is a division of application No. 16/301,863, granted, now 11,244,240, previously published as PCT/US2016/032917, filed on May 17, 2016.
Prior Publication US 2022/0138610 A1, May 5, 2022
Int. Cl. G06N 10/00 (2022.01)
CPC G06N 10/00 (2019.01) 28 Claims
OG exemplary drawing
 
1. An apparatus comprising:
quantum hardware comprising:
a quantum system comprising one or more qubits;
a universal set of quantum gates;
one or more measurement devices;
one or more classical processors in data communication with the quantum hardware;
wherein the quantum hardware and the one or more classical processors are configured to perform operations comprising:
randomly sampling a subset of quantum gates from the universal set of quantum gates, wherein the subset of quantum gates defines a quantum circuit;
repeatedly applying, by the quantum hardware, the quantum circuit to the quantum system and performing measurements on the quantum system to determine output information of the quantum system;
simulating, by the one or more classical processors, application of the quantum circuit to the quantum system to determine expected statistics of the quantum system; and
estimating, by the one or more classical processors, a fidelity of the quantum circuit based on the determined output information and the expected statistics of the quantum system.