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arXiv · 2305.09086

Ultranarrow linewidth room-temperature single-photon source from perovskite quantum dot embedded in optical microcavity

Amit R. Dhawan·Tristan Farrow·Ashley Marshall·Alex Ghorbal·Wonmin Son·Henry J. Snaith·Jason M. Smith·Robert A. Taylor
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Abstract

Ultranarrow bandwidth single-photon sources operating at room-temperature are of vital importance for viable optical quantum technologies at scale, including quantum key distribution, cloud based quantum information processing networks, and quantum metrology. Here we show a room-temperature ultranarrow bandwidth single-photon source generating polarised photons at a rate of 5MHz based on an inorganic CsPbI3 perovskite quantum dot embedded in a tunable open-access optical microcavity. When coupled to an optical cavity mode, the quantum dot room-temperature emission becomes single-mode and the spectrum narrows down to just 1 nm. The low numerical aperture of the optical cavities enables efficient collection of high-purity single-mode single-photon emission at room-temperature, offering promising performance for photonic and quantum technology applications. We measure 94% pure single-photon emission into a single-mode under pulsed and continuous-wave (CW) excitation.

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Amit R. Dhawan, Tristan Farrow, Ashley Marshall, Alex Ghorbal, Wonmin Son, Henry J. Snaith, Jason M. Smith, Robert A. Taylor. 2023-05-16. Ultranarrow linewidth room-temperature single-photon source from perovskite quantum dot embedded in optical microcavity. https://arxiv.org/abs/2305.09086

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