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1. (WO2018164784) ZZZ COUPLER FOR SUPERCONDUCTING QUBITS

Pub. No.:    WO/2018/164784    International Application No.:    PCT/US2018/016218
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Thu Feb 01 00:59:59 CET 2018
IPC: G06N 99/00
Applicants: NORTHROP GRUMMAN SYSTEMS CORPORATION
Inventors: FERGUSON, David George
PRZYBYSZ, Anthony Joseph
STRAND, Joel D.
Title: ZZZ COUPLER FOR SUPERCONDUCTING QUBITS
Abstract:
Systems and methods are provided for a ZZZ coupler. A first tunable coupler is coupled to the first qubit and tunable via a first control signal. A second tunable coupler is coupled to the first tunable coupler to direct a flux of the first qubit into a tuning loop of the second tunable coupler, such that when a first coupling strength associated with the first tunable coupler is non-zero, a second coupling strength, associated with the second tunable coupler, is a function of a second control signal applied to the second tunable coupler and a state of the first qubit. The second qubit and the third qubit are coupled to one another through the second tunable coupler, such that, when the second coupling strength is non-zero it is energetically favorable for the states of the first and second qubits to assume a specific relationship with respect to the Z-axis.