Long-Lived Spectrally-Multiplexed Quantum Memory In A Thulium-Doped Crystal

ORAL

Abstract

Rare-earth ion-doped crystals with long optical coherence lifetimes can serve as frequency-multiplexed, long-lived optical quantum memories, which are of an essential requirement towards building frequency multiplexed quantum repeaters for long-distance quantum communications. Towards this end, we investigate a thulium-doped crystal (Tm: YGG) at temperatures as low as 500 mK and low magnetic fields. This crystal offers an optical coherence lifetime exceeding one millisecond and a ground-state Zeeman level lifetime as long as tens of seconds. We take advantage of such exceptional features to show several key demonstrations; storage of optical pulses for up to 100 μs of storage time over a few MHz-wide of storage bandwidth, frequency-selective read-out of 11 distinct stored frequency modes, storage of heralded single photons confirming the quantum nature of our thulium quantum memory. Our results suggest that Tm: YGG can be a potential candidate to be used as an optical quantum memory in frequency multiplexed quantum repeater architecture.

*Alberta Innovates Technology Futures,
The National Science and Engineering Research Council of Canada,
The European Union’s Horizon 2020 Research and Innovation Program under Grant Agreement No. 820445 and the project name Quantum Internet Alliance.

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Presenters

  • Antariksha Das

    • Qutech, TU Delft
    • QuTech, Delft University of Technology

Authors

  • Antariksha Das

    • Qutech, TU Delft
    • QuTech, Delft University of Technology

  • Mohsen Falamarzi Askarani

    • Qutech, TU Delft
    • QuTech, Delft University of Technology

  • Jacob H Davidson

    • QuTech, Delft University of Technology

  • Neil Sinclair

    • Caltech
    • John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • Division of Physics, Mathematics and Astronomy, California Institute of Technology

  • Gustavo C Amaral

    • QuTech, Delft University of Technology
    • Delft University of Technology

  • Sara Marzban

    • QuTech, Delft University of Technology

  • Joshua A Slater

    • QuTech, Delft University of Technology

  • Daniel Oblak

    • University of Calgary
    • Department of Physics and Astronomy and Institute for Quantum Science and Technology, University of Calgary
    • Institute for Quantum Science and Technology, and Department of Physics & Astronomy, University of Calgary

  • Charles W Thiel

    • Montana State University
    • Department of Physics, Montana State University

  • Rufus L Cone

    • Department of Physics, Montana State University

  • Wolfgang Tittel

    • Qutech, TU Delft
    • QuTech, Delft University of Technology
    • Delft University of Technology