Random-access microwave quantum memory using chirped pulse phase encoding

ORAL

Abstract

We introduce a random access quantum memory protocol using adiabatic fast passages (AFPs) to imprint phase shifts onto single quantum excitations stored in an ensemble of emitters coupled to a cavity. These spatially- and spectrally-dependent phase shifts suppress collective emission of the excitations stored in the ensemble and uniquely label them so they can be retrieved on-demand following the application of a precise AFP. In addition to random access, our protocol offers in-built dynamical decoupling while suppressing emission into the cavity when the ensemble is in the excited state. We experimentally demonstrate the protocol using Bi donor spins in Si coupled to a superconducting resonator, storing up to four weak (~400 photon) microwave pulses before retrieving them, in a different order, up to 2 ms later. With even modest cooperativity (C~0.05) echo emission from the excited ensemble state results in superradiant echo emission, reducing the fidelity and lifetime of the memory, and we show that this is mitigated using our protocol. Finally, we explore the independence of the storage modes and implications for scaling the memory and enhancing its efficiency and lifetime.

*Horizon 2020 grant No. 771493; UK EPSRC grant Nos. EP/P510270/1, EP/L015242/1; Surrey Ion Beam Centre

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Presenters

  • Oscar Kennedy

    • London Centre for Nanotechnology, University College London
    • Imperial College London

Authors

  • Oscar Kennedy

    • London Centre for Nanotechnology, University College London
    • Imperial College London

  • James O'Sullivan

    • London Centre for Nanotechnology, University College London

  • Joseph Alexander

    • London Centre for Nanotechnology, University College London

  • Kamanasish Debnath

    • Department of Physics, Aarhus University

  • Chris Thomas

    • Cavendish Laboratory, Cambridge University

  • Christoph Zollitsch

    • London Centre for Nanotechnology, University College London

  • Mantas Šimenas

    • London Centre for Nanotechnology, University College London

  • Akel Hashim

    • Univ of California – Berkeley
    • University of California, Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • University of California - Berkeley

  • Stafford Withington

    • Cavendish Laboratory, Cambridge University

  • Irfan Siddiqi

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California - Berkeley
    • Univ of California – Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • Physics, University of California, Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Klaus Molmer

    • Physics and Astronomy, Aarhus University
    • Department of Physics, Aarhus University

  • John J. L. Morton

    • University College London
    • London Center Nanotechnology
    • London Centre for Nanotechnology, University College London
    • University College London, Quantum Motion Technologies
    • London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom; Quantum Motion Technologies, Nexus, Discovery Way, Leeds, LS2 3AA, United Kingdo