Overcoming the Rate-Directionality Trade-off: A Room-Temperature Ultrabright Quantum Light Source

Hamza Abudayyeh, Annika Mildner, Dror Liran, Boaz Lubotzky, Lars Lüder, Monika Fleischer, Ronen Rapaport*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Deterministic GHz-rate single photon sources at room temperature would be essential components for various quantum applications. However, both the slow intrinsic decay rate and the omnidirectional emission of typical quantum emitters are two obstacles toward achieving such a goal which are hard to overcome simultaneously. Here, we solve this challenge by a hybrid approach using a complex monolithic photonic resonator constructed of a gold nanocone responsible for the rate enhancement, enclosed by a circular Bragg antenna for emission directionality. A repeatable process accurately binds quantum dots to the tip of the antenna-embedded nanocone. As a result, we achieve simultaneous 20-fold emission rate enhancement and record-high directionality leading to an increase in the observed brightness by a factor as large as 800 (130) into an NA = 0.22(0.5). We project that these miniaturized on-chip devices can reach photon rates approaching 1.4 × 108 photons/s and pure single photon rates of >107 photons/second after temporal purification processes, thus enabling ultrafast light-matter interfaces for quantum technologies at ambient conditions.

Original languageAmerican English
Pages (from-to)17384-17391
Number of pages8
JournalACS Nano
Issue number11
StatePublished - 23 Nov 2021

Bibliographical note

Publisher Copyright:


  • Purcell factor
  • colloidal nanocrystals
  • directional emission
  • nanoantenna
  • plasmonic resonator
  • quantum dots
  • single-photon source


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