公开(公告)号：US20230274172A1

公开(公告)日：2023-08-31

申请号：US18311746

申请日：2023-05-03

Applicant: Google LLC

Inventor： Yuezhen Niu ,  Hartmut Niu ,  Vadim Smelyanskiy ,  Sergio Boixo Castrillo

IPC: G06N10/00 ,  H03K3/38

CPC classification number: G06N10/00 ,  H03K3/38

Abstract: Methods, systems, and apparatus for implementing a unitary quantum gate on one or more qubits. In one aspect, a method includes the actions designing a control pulse for the unitary quantum gate, comprising: defining a universal quantum control cost function, wherein the control cost function comprises a qubit leakage penalty term representing i) coherent qubit leakage, and ii) incoherent qubit leakage across all frequency components during a time dependent Hamiltonian evolution that realizes the unitary quantum gate; adjusting parameters of the time dependent Hamiltonian evolution to vary a control cost according to the control cost function such that leakage errors are reduced; generating the control pulse using the adjusted parameters; and applying the control pulse to the one or more qubits to implement the unitary quantum gate.