Simple All-Microwave Entangling Gate for Fixed-Frequency Superconducting Qubits

Jerry M. Chow, A. D. Córcoles, Jay M. Gambetta, Chad Rigetti, B. R. Johnson, John A. Smolin, J. R. Rozen, George A. Keefe, Mary B. Rothwell, Mark B. Ketchen, and M. Steffen
Phys. Rev. Lett. 107, 080502 – Published 17 August 2011

Abstract

We demonstrate an all-microwave two-qubit gate on superconducting qubits which are fixed in frequency at optimal bias points. The gate requires no additional subcircuitry and is tunable via the amplitude of microwave irradiation on one qubit at the transition frequency of the other. We use the gate to generate entangled states with a maximal extracted concurrence of 0.88, and quantum process tomography reveals a gate fidelity of 81%.

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  • Received 2 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.080502

© 2011 American Physical Society

Authors & Affiliations

Jerry M. Chow1, A. D. Córcoles1, Jay M. Gambetta1, Chad Rigetti1, B. R. Johnson2, John A. Smolin1, J. R. Rozen1, George A. Keefe1, Mary B. Rothwell1, Mark B. Ketchen1, and M. Steffen1

  • 1IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA
  • 2Raytheon BBN Technologies, Cambridge, Massachusetts 02138, USA

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Vol. 107, Iss. 8 — 19 August 2011

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