International Business Machines Corporation

Xuan Wei

Jay Michael Gambetta

Maika Takita

Sarah Elizabeth Sheldon

David C Mckay

George Andrew Keefe

Abhinav Kandala

Srikanth Srinivasan

Systems and techniques that facilitate space-saving coupler arm arrangement for superconducting qubits are provided. In various embodiments, a device can comprise a superconducting qubit. In various aspects, the superconducting qubit can be capacitively coupled to two or more coupler arms. In various instances, a parasitic capacitance between the two or more coupler arms can be within an order of magnitude of a capacitance between the superconducting qubit and at least one of the two or more coupler arms. In various cases, the parasitic capacitance can arise due to a physical proximity between the two or more coupler arms.

Space-saving coupler arm arrangement for superconducting qubits

An embodiment includes (CR) gate having a first control qubit coupled with a first target qubit, and a second CR gate having a second control qubit coupled with a second target qubit and the first control qubit. The embodiment also includes controller circuitry for performing operations including first and second iterations of: during a first time period, directing respective CR pulses to the first and second control qubits; during a second time period, directing respective single qubit pulses to the first control qubit and to the second target qubit; during a third time period, directing respective CR pulses to the first and second control qubits; and during a fourth time period, directing respective single qubit pulses to the second control qubit and to the first target qubit.

Simultaneously driving adjacent qubit pairs

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White Plains, NY, United States of America

Xuan Wei