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Coherent light scattering from a telecom C-band quantum dot

Author

Listed:
  • L. Wells

    (Toshiba Research Europe Limited
    University of Cambridge)

  • T. Müller

    (Toshiba Research Europe Limited)

  • R. M. Stevenson

    (Toshiba Research Europe Limited)

  • J. Skiba-Szymanska

    (Toshiba Research Europe Limited)

  • D. A. Ritchie

    (University of Cambridge)

  • A. J. Shields

    (Toshiba Research Europe Limited)

Abstract

Quantum networks have the potential to transform secure communication via quantum key distribution and enable novel concepts in distributed quantum computing and sensing. Coherent quantum light generation at telecom wavelengths is fundamental for fibre-based network implementations, but Fourier-limited emission and subnatural linewidth photons have so far only been reported from systems operating in the visible to near-infrared wavelength range. Here, we use InAs/InP quantum dots to demonstrate photons with coherence times much longer than the Fourier limit at telecom wavelength via elastic scattering of excitation laser photons. Further, we show that even the inelastically scattered photons have coherence times within the error bars of the Fourier limit. Finally, we make direct use of the minimal attenuation in fibre for these photons by measuring two-photon interference after 25 km of fibre, demonstrating finite interference visibility for photons emitted about 100,000 excitation cycles apart.

Suggested Citation

  • L. Wells & T. Müller & R. M. Stevenson & J. Skiba-Szymanska & D. A. Ritchie & A. J. Shields, 2023. "Coherent light scattering from a telecom C-band quantum dot," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43757-3
    DOI: 10.1038/s41467-023-43757-3
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    References listed on IDEAS

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    1. Łukasz Dusanowski & Cornelius Nawrath & Simone L. Portalupi & Michael Jetter & Tobias Huber & Sebastian Klembt & Peter Michler & Sven Höfling, 2022. "Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
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    3. M.B. Ward & M.C. Dean & R.M. Stevenson & A.J. Bennett & D.J.P. Ellis & K. Cooper & I. Farrer & C.A. Nicoll & D.A. Ritchie & A.J. Shields, 2014. "Coherent dynamics of a telecom-wavelength entangled photon source," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
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