Postselection-free energy-time entanglement

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

doi:10.1103/PhysRevA.54.R1

Postselection-free energy-time entanglement

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

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	R1-R4
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	54
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.54.R1
State	Published - 1996
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1103/PhysRevA.54.R1

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AU - Kwiat, P. G.

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AB - 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.

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Postselection-free energy-time entanglement

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