Tunable quantum gate between a superconducting atom and a propagating microwave photon

ORAL

Abstract

We propose a two-qubit quantum logic gate between a superconducting atom and a propagating microwave photon. The atomic qubit is encoded on its lowest two levels and the photonic qubit is encoded on its carrier frequencies. The gate operation completes deterministically upon reflection of a photon, and various two-qubit gates (SWAP, $\sqrt{\rm SWAP}$, and Identity) are realized through {\it in situ} control of the drive field. The proposed gate is applicable to construction of a network of superconducting atoms, which enables gate operations between non-neighboring atoms.

*This work is supported by JSPS KAKENHI (Grants No. 16K05497, No. 26220601, and No. 15K17731) and ERATO, JST.

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Authors

  • Kazuki Koshino

    • Tokyo Medical and Dental University

  • Kunihiro Inomata

    • RIKEN Center for Emergent Matter Science
    • Institute of Physical and Chemical Research(RIKEN)

  • Zhirong Lin

    • RIKEN Center for Emergent Matter Science

  • Yuuki Tokunaga

    • NTT Secure Platform Laboratories

  • Tsuyoshi Yamamoto

    • NEC IoT Device Research Laboratories

  • Yasunobu Nakamura

    • RCAST, The University of Tokyo, CEMS, RIKEN
    • RCAST, The University of Tokyo/CEMS, RIKEN
    • The University of Tokyo, RIKEN Center for Emergent Matter Science
    • Research Center for Advanced Science and Technology, The University of Tokyo, Center for Emergent Matter Science, RIKEN
    • Univ of Tokyo, RIKEN CEMS