First C2N Colloquium 2024 by Pascale Senellart

Semiconductor quantum dots have emerged as interesting quantum emitters for quantum technologies. First synthetized in the laboratories of France Telecom in the mid 80s, their quantum properties have been unraveled in 1994 by Jean-Yves Marzin and Jean-Michel Gérard [1]. Progressively, quantum dots have been shown to behave as artificial atoms, combining the great potential for quantum optics of natural atoms, with unique features arising from their solid-state environment.

In this talk, Pascale Senellart discussed how the team at C2N contributed to this journey from solid-state nanophotonics to quantum technologies. she fist explained how we have progressively developed efficient sources of single and entangled photons  [2] that are now commercialized by the C2N spin-off Quandela. These devices allow implementing small-scale quantum computing protocols with 6 photons [3]. To scale-up, we recently reached an important milestone where multiple photons are entangled with a single spin [4]. Finally, she illustrated how the maturity of our devices now allow us to go back to fundamental studies such as revisiting the process of spontaneous emission [5,6] or studying energetic exchanges in the quantum realm [7].

[1] J. -Y. Marzin, et al.,  Phys. Rev. Lett. 73, 716 (1994)

[2] N. Somaschi, V. Giesz et al, Nature Photonics 10, 340-345,  (2016)

[3] N. Maring et al.,  arXiv:2306.00874

[4] N. Coste et al., Nature Photonics (2023)

[5] J. Loredo et al, Nature Photonics 13, 803 (2019)

[6] S. Wein et al, Nature Photonics 16, 374 (2022)

[7] I. Maillette de Buy Wenniger, Physical Review Letter (2023)

Keywords: quantum dots, microcavities, single photons, quantum computing

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