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Spin-photon entanglement with direct photon emission in the telecom C-band

Author

Listed:
  • P. Laccotripes

    (Toshiba Europe Limited
    University of Cambridge)

  • T. Müller

    (Toshiba Europe Limited)

  • R. M. Stevenson

    (Toshiba Europe Limited)

  • J. Skiba-Szymanska

    (Toshiba Europe Limited)

  • D. A. Ritchie

    (University of Cambridge)

  • A. J. Shields

    (Toshiba Europe Limited)

Abstract

Quantum networks, relying on the distribution of quantum entanglement between remote locations, have the potential to transform quantum computation and secure long-distance quantum communication. However, a fundamental ingredient for fibre-based implementations of such networks, namely entanglement between a single spin and a photon directly emitted at telecom wavelengths, has been unattainable so far. Here, we use a negatively charged exciton in an InAs/InP quantum dot to implement an optically active spin qubit taking advantage of the lowest-loss transmission window, the telecom C-band. We investigate the coherent interactions of the spin-qubit system under resonant excitation, demonstrating high fidelity spin initialisation and coherent control using picosecond pulses. We further use these tools to measure the coherence of a single, undisturbed electron spin in our system. Finally, we demonstrate spin-photon entanglement in a solid-state system with entanglement fidelity F = 80.07 ± 2.9%, more than 10 standard deviations above the classical limit.

Suggested Citation

  • P. Laccotripes & T. Müller & R. M. Stevenson & J. Skiba-Szymanska & D. A. Ritchie & A. J. Shields, 2024. "Spin-photon entanglement with direct photon emission in the telecom C-band," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53964-1
    DOI: 10.1038/s41467-024-53964-1
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    References listed on IDEAS

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