Experimental study of a subsystem in an entangled two-photon state

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PhysRevA.60.2685.pdf (201.89 KB)

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https://link.aps.org/doi/10.1103/PhysRevA.60.2685

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https://doi.org/10.1103/PhysRevA.60.2685
 http://hdl.handle.net/11603/39890

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UMBC Physics Department
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Date

1999-10-01

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journal articles
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Citation of Original Publication

Strekalov, Dmitry V., Yoon-Ho Kim, and Yanhua Shih. "Experimental Study of a Subsystem in an Entangled Two-Photon State". Physical Review A 60, no. 4 (1999): 2685–88. https://doi.org/10.1103/PhysRevA.60.2685.

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©1999 American Physical Society

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UMBC Quantum Optics Laboratory

Abstract

The state of a signal-idler photon pair of spontaneous parametric down-conversion is a typical nonlocal entangled pure state with zero entropy. The precise correlation of the subsystems is completely described by the state. However, it is an experimental choice to study only one subsystem and to ignore the other. What can we learn about the measured subsystem? Results of this kind of measurements look peculiar. The experiment confirms that the two subsystems are both in mixed states with entropy greater than zero. One can only obtain statistical knowledge of the subsystems in this kind of measurement.