US 11,990,905 B1
Parametrically activated quantum logic gates
Eyob A. Sete, Walnut Creek, CA (US); Nicolas Didier, Berkeley, CA (US); Marcus Palmer da Silva, Lafayette, CA (US); Chad Tyler Rigetti, Walnut Creek, CA (US); Matthew J. Reagor, San Rafael, CA (US); Shane Arthur Caldwell, Oakland, CA (US); Nikolas Anton Tezak, Oakland, CA (US); Colm Andrew Ryan, Albany, CA (US); Sabrina Sae Byul Hong, Oakland, CA (US); Prasahnt Sivarajah, Emeryville, CA (US); Alexander Papageorge, San Francisco, CA (US); and Deanna Margo Abrams, Oakland, CA (US)
Assigned to Rigetti & Co, LLC, Berkeley, CA (US)
Filed by Rigetti & Co, LLC, Berkeley, CA (US)
Filed on Apr. 26, 2023, as Appl. No. 18/307,647.
Application 18/307,647 is a continuation of application No. 17/410,042, filed on Aug. 24, 2021, granted, now 11,677,402.
Application 17/410,042 is a continuation of application No. 16/663,809, filed on Oct. 25, 2019, granted, now 11,108,398, issued on Aug. 31, 2021.
Application 16/663,809 is a continuation of application No. 16/012,551, filed on Jun. 19, 2018, granted, now 10,483,980, issued on Nov. 19, 2019.
Claims priority of provisional application 62/666,545, filed on May 3, 2018.
Claims priority of provisional application 62/637,855, filed on Mar. 2, 2018.
Claims priority of provisional application 62/573,446, filed on Oct. 17, 2017.
Claims priority of provisional application 62/521,943, filed on Jun. 19, 2017.
Int. Cl. G06N 99/00 (2019.01); G06N 10/00 (2022.01); H03K 19/195 (2006.01)
CPC H03K 19/195 (2013.01) [G06N 10/00 (2019.01)] 19 Claims
OG exemplary drawing
 
1. A method comprising:
measuring qubit device parameters for a plurality of qubit devices in a quantum processor circuit, the plurality of qubit devices comprising a fixed-frequency qubit device and a tunable qubit device;
measuring a frequency shift of the tunable qubit device under an operating condition, the operating condition comprising a flux modulation applied to the tunable qubit device;
measuring a coherence time of the tunable qubit device under the operating condition;
selecting initial gate parameters of a two-qubit quantum logic gate for application to a pair of qubits defined by the fixed-frequency qubit device and the tunable qubit device, wherein the initial gate parameters are selected based on the frequency shift and the coherence time;
generating refined gate parameters from the initial gate parameters based on spectroscopic measurements of the two-qubit quantum logic gate applied to the quantum processor circuit; and
benchmarking the two-qubit quantum logic gate based on the refined gate parameters.