Tunable Bell-inequality violations by non-maximally-violating states in type-II parametric down-conversion

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PhysRevA523344.pdf (310.55 KB)

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https://link.aps.org/doi/10.1103/PhysRevA.52.3344

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http://doi.org/10.1103/PhysRevA.52.3344
 http://hdl.handle.net/11603/39915

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UMBC Physics Department
UMBC Faculty Collection

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Date

1995-10-01

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journal articles
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Citation of Original Publication

Kiess, T. E., Y. H. Shih, A. V. Sergienko, and C. O. Alley. “Tunable Bell-Inequality Violations by Non-Maximally-Violating States in Type-II Parametric down-Conversion.” Physical Review A 52, no. 4 (1995): 3344–47. https://doi.org/10.1103/PhysRevA.52.3344.

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©1995 American Physical Society.

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UMBC Quantum Optics Laboratory

Abstract

We use a tunable quantum interference in type-II parametric down-conversion to construct two-photon quantum states that exhibit less-than-maximal, and tunable, violations of Bell-type inequalities. These states, no longer singlet-state analogs, possess an interference term of controllable magnitude that we adjust by tuning the measurement bandwidth. We show violations of two Bell-type inequalities in polarization variables, one more general than the other. We use these tunable violations to probe the threshold degree of interference that must be present to generate a violation, using an appropriate quantitative figure of merit.