Postselection-free energy-time entanglement

D. V. Strekalov, T. B. Pittman, A. V. Sergienko, Y. H. Shih, P. G. Kwiat

Research output: Contribution to journalArticlepeer-review


We report a two-photon interference experiment that realizes a postselection-free test of Bell's inequality based on energy-time entanglement. In contrast with all previous experiments of this type, the employed entangled states are obtained without the use of a beam splitter or a short coincidence window to "throw away" unwanted amplitudes. A (95.0±1.4)% interference fringe visibility is observed, implying a strong violation of the Bell inequality. The scheme is very compact and has demonstrated excellent stability, suggesting that it may be useful, for example, in practical quantum cryptography.

Original languageEnglish (US)
Pages (from-to)R1-R4
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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