Sub-100ns entangling gates between two strongly coupled transmon qubits

ORAL

Abstract

Superconducting qubits are very promising candidates for realizing a fault-tolerant quantum computer. However, implementing two-qubit entangling gates with short gate operation time and high fidelity is still a challenge with superconducting qubits. In this talk, we demonstrate a new type of two-qubit entangling gate, the SWIPHT gate [1], on a coupled-transmon device. The two-transmon system, strongly coupled through a bus resonator, is tuned into the secondary resonance regime, where the effective σ1zσ2z interaction is enhanced due to the coupling to higher levels of the transmons. Unconditional single qubit gates two-transmon systems with strong σ1zσ2z interaction were developed. This allows a SWIPHT CNOT gate with roughly 90 ns gate time. The gate fidelity is extracted by quantum process tomography.

[1] Sophia E. Economou and Edwin Barnes. Phys. Rev. B 91, 161405 (2015)

*All the authors acknowledge support of the NIST Quantum Based Metrology Initiative

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Presenters

  • Junling Long

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder

Authors

  • Junling Long

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder

  • Hsiang-Sheng Ku

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder
    • Alibaba

  • Russell Lake

    • National Institute of Standards and Technology (NIST), Boulder
    • Boulder, NIST
    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder

  • Xian Wu

    • Physical and Life Sciences Directorate, Lwarence Livermore National Laboratory
    • National Institute of Standards and Technology, Boulder
    • National Institute of Standards and Technology Boulder
    • Lawrence Livermore National Laboratory

  • Mustafa Bal

    • Quantum Devices, NIST-Boulder
    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder

  • Corey Rae McRae

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder

  • David Pappas

    • National Institute of Standards and Technology (NIST), Boulder
    • Quantum Devices, NIST-Boulder
    • National Institute of Standards and Technology Boulder
    • NIST, Boulder, Colorado
    • National Institute of Standards and Technology, Boulder