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<p>Semiconductor quantum dots in microcavities are an excellent platform for the efficient generation of indistinguishable single photons. However, their use in a wide range of quantum technologies requires their controlled fabrication and integration in compact closed-cycle cryocoolers, with a key challenge being the efficient and stable extraction of the single photons into a single-mode fibre. Here we report on a method for the&#xa0;fibre-pigtailing of deterministically fabricated single-photon sources. Our technique allows for nanometre-scale alignment accuracy between the source and a fibre, alignment that persists all the way from room temperature to 2.4 K. We demonstrate high performance of the device under near-resonant optical excitation with a photon indistinguishability of 97.5 % and a brightness at the output fibre of the system of 20.8 %. We show that the indistinguishability and single-photon rate are stable for over ten hours of continuous operation in a single cooldown. We further confirm that the device performance is not degraded by nine successive cooldown-warmup cycles.</p>

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Efficient fibre-pigtailed source of indistinguishable single photons

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月14日

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  • Nico Margaria,
  • Florian Pastier,
  • Thinhinane Bennour,
  • Marie Billard,
  • Edouard Ivanov,
  • William Hease,
  • Petr Stepanov,
  • Albert F. Adiyatullin,
  • Raksha Singla,
  • Mathias Pont,
  • Maxime Descampeaux,
  • Alice Bernard,
  • Anton Pishchagin,
  • Martina Morassi,
  • Aristide Lemaître,
  • Thomas Volz,
  • Valérian Giesz,
  • Niccolo Somaschi,
  • Nicolas Maring,
  • Sébastien Boissier,
  • Thi Huong Au,
  • Pascale Senellart

摘要

Semiconductor quantum dots in microcavities are an excellent platform for the efficient generation of indistinguishable single photons. However, their use in a wide range of quantum technologies requires their controlled fabrication and integration in compact closed-cycle cryocoolers, with a key challenge being the efficient and stable extraction of the single photons into a single-mode fibre. Here we report on a method for the fibre-pigtailing of deterministically fabricated single-photon sources. Our technique allows for nanometre-scale alignment accuracy between the source and a fibre, alignment that persists all the way from room temperature to 2.4 K. We demonstrate high performance of the device under near-resonant optical excitation with a photon indistinguishability of 97.5 % and a brightness at the output fibre of the system of 20.8 %. We show that the indistinguishability and single-photon rate are stable for over ten hours of continuous operation in a single cooldown. We further confirm that the device performance is not degraded by nine successive cooldown-warmup cycles.