Spin-Photon Entanglement of a Single Rare-Earth-Ion at the Telecom Band

ORAL

Abstract

Long-distance quantum networks require scalable telecom-band spin-photon interfaces. Among these, rare earth ions (REI) have recently garnered attention, with Er3+ standing out due to its telecom band optical transition. Our previous study demonstrated that integrating Er3+ into CaWO4 substantially suppresses spectral diffusion, leading to the observation of indistinguishable photons. Additionally, the low nuclear spin abundance and minimal background REI concentration in this system result in enhanced spin coherence [1]. In this work, we utilize the improved spin and optical coherence and employ a dynamical decoupling-based entanglement scheme to demonstrate spin-photon entanglement. This result marks a significant step towards REI-based long distance quantum communication.

* This work was supported by the US Department of Energy (DOE), Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704. We also acknowledge support from the DOE Early Career award (grant no. DE-SC0020120, for modelling of decoherence mechanisms and spin interactions), as well as AFOSR (grant nos. FA9550-18-10334 and YIP FA9550-18-1-0081).

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Publication: [1] Ourari, S., Dusanowski, Ł., Horvath, S.P., Uysal, M.T., et al. Indistinguishable telecom band photons from a single Er ion in the solid state. Nature 620, 977–981 (2023).

Presenters

  • Haitong Xu

    Princeton University

Authors

  • Haitong Xu

    Princeton University

  • Mehmet Tuna Uysal

    Princeton University

  • Lukasz Dusanowski

    Princeton University

  • Sebastian P Horvath

    Princeton University

  • Salim Ourari

    Princeton University

  • Adam T Turflinger

    Princeton University

  • Robert J Cava

    Princeton University

  • Nathalie P de Leon

    Princeton University

  • Jeff D Thompson

    Princeton University