Dispersion cancellation in a measurement of the single-photon propagation velocity in glass

A. M. Steinberg, P. G. Kwiat, R. Y. Chiao

Research output: Contribution to journalArticlepeer-review

Abstract

We have demonstrated for the first time that single photons in glass travel at the group velocity, and have observed a novel, nonlocal dispersion-cancellation effect. We used a two-photon interferometer in which a conjugate pair of photons produced in parametric fluorescence travel separate paths and are detected in coincidence after being recombined at a beam splitter. A piece of glass was placed in the path of one of the photons, and a variable delay was adjusted to precisely compensate for it. The single-photon propagation time was thus measured to within approximately 4 fsec.

Original languageEnglish (US)
Pages (from-to)2421-2424
Number of pages4
JournalPhysical review letters
Volume68
Issue number16
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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