Two-photon interference in a Mach-Zehnder interferometer

JG Rarity, P.R. Tapster, E Jakeman, T Larchuk, R.A. Campos, M.C. Teich, B.E.A. Saleh

Research output: Contribution to journalArticle (Academic Journal)peer-review

287 Citations (Scopus)


Pairs of 826.8-nm correlated photons, generated by parametrically down-converting 413.4-nm krypton-ion laser light, are directed into a single Mach-Zehnder interferometer such that each photon of the pair enters a different input port. The rate of coincidence at the two output ports displays oscillations (as the path-length difference is swept) with a spatial period equal to the 413-nm wavelength of the pump photons, and with a visibility of 62% when the path-length difference exceeds the coherence length of the individual photon beams. This unequivocally demonstrates the nonclassical and entangled nature of the two-phase state
Translated title of the contributionTwo-photon interference in a Mach-Zehnder interferometer
Original languageEnglish
Pages (from-to)1348 - 1351
Number of pages4
JournalPhysical Review Letters
Volume65 (11)
Publication statusPublished - Sept 1990

Structured keywords

  • Photonics and Quantum


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