1-nm linewidth room temperature single-photon source from optical microcavity-embedded CsPbI3 perovskite quantum dots

Abstract

Ultra-narrow 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 single-photon source generating polarised photons at a rate of 5MHz based on an inorganic CsPbI3 perovskite quantum dot embedded in a tunable open optical microcavity. When coupled to the mode of the optical cavity, the quantum dot room-temperature emission becomes single-mode and the spectrum narrows down to just ∼ 1 nm. The excellent directionality of the optical modes enables high single-mode collection at RT, offering promising performance for photonic and quantum technology applications. We measure 94% single-photon purity under pulsed and continuous-wave (CW) excitation.

Giant Superbunching Emission from Mesoscopic Perovskite Emitter Clusters

“…[28,29] The successful growth of all-inorganic perovskite nanocrystals showing much-improved stability against their organic-inorganic counterpart, has inspired more enthusiasm for this field. [30,31] Since then, a lot of efforts have been devoted to studying their applications in a variety of fields, for example, single photon emitters, [32][33][34][35][36][37] and to understanding their basic properties. [38][39][40][41][42][43] The superfluorescent emission has recently been achieved in perovskite QD superlattice [26,44,45] and thin films.…”