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Phys Rev Lett. 2002 Sep 9;89(11):113601. Epub 2002 Aug 26.

"Two-Photon" coincidence imaging with a classical source.

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The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.


Coincidence imaging is a technique that extracts an image of a test system from the statistics of photons transmitted by a reference system when the two systems are illuminated by a source possessing appropriate correlations. It has recently been argued that quantum entangled sources are necessary for the implementation of this technique. We show that this technique does not require entanglement, and we provide an experimental demonstration of coincidence imaging using a classical source. We further find that any kind of coincidence imaging technique which uses a "bucket" detector in the test arm is incapable of imaging phase-only objects, whether a classical or quantum source is employed.

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