Efficient fibre-pigtailed source of indistinguishable single photons

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 and Pascale Senellart
Additional contact information
Nico Margaria: Quandela SAS
Florian Pastier: Quandela SAS
Thinhinane Bennour: Quandela SAS
Marie Billard: Quandela SAS
Edouard Ivanov: Quandela SAS
William Hease: Quandela SAS
Petr Stepanov: Quandela SAS
Albert F. Adiyatullin: Quandela SAS
Raksha Singla: Quandela SAS
Mathias Pont: Quandela SAS
Maxime Descampeaux: Quandela SAS
Alice Bernard: Quandela SAS
Anton Pishchagin: Quandela SAS
Martina Morassi: Université Paris-Saclay, CNRS
Aristide Lemaître: Université Paris-Saclay, CNRS
Thomas Volz: Quandela GmbH
Valérian Giesz: Quandela SAS
Niccolo Somaschi: Quandela SAS
Nicolas Maring: Quandela SAS
Sébastien Boissier: Quandela SAS
Thi Huong Au: Quandela SAS
Pascale Senellart: Université Paris-Saclay, CNRS

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-62712-y

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