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

Details Experimental study of a photon as a subsystem of an entangled two-photon state Experimental study of a photon as a subsystem of an entangled two-photon state

1998-11-23

arxiv.org/abs/quant-ph/9811060v1

Phys.Rev. A60 (1999) 2685

Physics

Quantum Physics

14 pages, 2 eps figures

Scientific paper

10.1103/PhysRevA.60.2685

The state of the signal-idler photon pair of spontaneous parametric down conversion(SPDC) 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 and the remaining parts? 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.

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