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

Journal article

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 single-mode photons at a rate of 5 MHz 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 in a single-mode under pulsed and continuous-wave (CW) excitation.

Authors: Farrow, T; Dhawan, AR; Marshall, AR; Ghorbal, A; Son, W

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Chemical Society
• Journal: Nano Letters
• Volume: 23
• Issue: 23
• Pages: 10667-10673
• Publication date: 2023-11-28
• Acceptance date: 2023-11-21
• DOI: 10.1021/acs.nanolett.3c02058
• EISSN: 1530-6992
• ISSN: 1530-6984
• Language: English
• Keywords: FFR