Low-light-level photon switching by quantum interference

Yong Fan Chen, Zen Hsiang Tsai, Yu Chen Liu, Ite A. Yu

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


We report an experimental demonstration of low-light-level photon switching by quantum interference in laser-cooled 87Rb atoms. A resonant probe pulse with an energy per unit area of one photon per λ2/2π propagates through the optically thick atoms. Its energy transmittance is greater than 63%, or a loss of less than e-1, because of the effect of electromagnetically induced transparency. In the presence of a switching pulse with an energy per unit area of 1.4 photons per λ2/ 2π, the energy transmittance of the same probe pulse becomes less than 37%, or e-1. This substantial reduction of probe transmittance caused by switching photons may lead to potential applications in single-photon-level nonlinear optics and manipulation of quantum information.

Original languageEnglish
Pages (from-to)3207-3209
Number of pages3
JournalOptics Letters
Issue number23
Publication statusPublished - 2005 Dec 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Low-light-level photon switching by quantum interference'. Together they form a unique fingerprint.

Cite this