Correlated two-photon interference in a dual-beam Michelson interferometer

P. G. Kwiat, W. A. Vareka, C. K. Hong, H. Nathel, R. Y. Chiao

Research output: Contribution to journalArticlepeer-review


We report on an interference effect arising from a two-photon entangled state produced in a potassium dihydrogen phosphate (KDP) crystal pumped by an ultraviolet argon-ion laser. Two conjugate beams of signal and idler photons were injected in a parallel configuration into a single Michelson interferometer, and detected separately by two photomultipliers, while the difference in its arm lengths was slowly scanned. The coincidence rate exhibited fringes with a visibility of nearly 50%, and a period given by half the ultraviolet (not the signal or idler) wavelength, while the singles rate exhibited no fringes.

Original languageEnglish (US)
Pages (from-to)2910-2913
Number of pages4
JournalPhysical Review A
Issue number5
StatePublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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