Identifying Entanglement Using Quantum Ghost Interference and Imaging

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PhysRevLett.92.233601.pdf (203.36 KB)

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https://link.aps.org/doi/10.1103/PhysRevLett.92.233601

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https://doi.org/10.1103/PhysRevLett.92.233601
 http://hdl.handle.net/11603/40008

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https://orcid.org/0000-0002-8206-3982

Date

2004-06-08

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journal articles
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Citation of Original Publication

D’Angelo, Milena, Yoon-Ho Kim, Sergei P. Kulik, and Yanhua Shih. “Identifying Entanglement Using Quantum Ghost Interference and Imaging.” Physical Review Letters 92, no. 23 (2004): 233601. https://doi.org/10.1103/PhysRevLett.92.233601.

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©2004 American Physical Society

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UMBC Quantum Optics Laboratory

Abstract

We report a quantum interference and imaging experiment which allows identifying the entanglement in momentum and position variables of a two-photon system. The measurements show indeed that the uncertainties in the sum of momenta and in the difference of positions of the entangled two-photon satisfy both EPR inequalities △(k₁ + k₂)< min(△k₁, △k₂) and △(x₁ - x₂) <min (△x₁, △x₂). These two inequalities, together, represent a nonclassicality condition. Our measurements provide a direct way to distinguish between quantum entanglement and classical correlation in continuous variables for systems of pairs of photons.