Efficient routing of single photons by one atom and a microtoroidal cavity

Takao Aoki*, A. S. Parkins, D. J. Alton, C. A. Regal, Barak Dayan, E. Ostby, K. J. Vahala, H. J. Kimble

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

213 Citations (Scopus)


Single photons from a coherent input are efficiently redirected to a separate output by way of a fiber-coupled microtoroidal cavity interacting with individual cesium atoms. By operating in an overcoupled regime for the input-output to a tapered fiber, our system functions as a quantum router with high efficiency for photon sorting. Single photons are reflected and excess photons transmitted, as confirmed by observations of photon antibunching (bunching) for the reflected (transmitted) light. Our photon router is robust against large variations of atomic position and input power, with the observed photon antibunching persisting for intracavity photon number 0.03 n̄ 0.7.

Original languageEnglish
Article number083601
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 2009 Feb 27
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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