US 12,131,226 B2
Universal control for implementing quantum gates
Yuezhen Niu, El Segundo, CA (US); 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 May 3, 2023, as Appl. No. 18/311,746.
Application 18/311,746 is a continuation of application No. 17/339,276, filed on Jun. 4, 2021, granted, now 11,657,315.
Application 17/339,276 is a continuation of application No. 16/961,388, granted, now 11,055,627, issued on Jul. 6, 2021, previously published as PCT/US2018/016225, filed on Jan. 31, 2018.
Prior Publication US 2023/0274172 A1, Aug. 31, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06N 10/00 (2022.01); H03K 3/38 (2006.01)
CPC G06N 10/00 (2019.01) [H03K 3/38 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for implementing a unitary quantum gate on one or more qubits, the method comprising:
obtaining, by quantum hardware and from a classical processor, data specifying a control pulse for the unitary quantum gate, wherein the control pulse:
is dependent on a universal quantum control cost function that comprises a qubit leakage penalty term that represents qubit leakage during a time dependent Hamiltonian evolution that realizes the unitary quantum gate; and
comprises adjusted values of parameters of the time dependent Hamiltonian evolution that produce a control cost of the universal quantum control cost function with reduced leakage errors; and
applying, by the quantum hardware, the control pulse to the one or more qubits to implement the unitary quantum gate.