Phys. Rev. Lett. 88, 183602 (2002) [4 pages]Generating Entangled Two-Photon States with Coincident FrequenciesReceived 26 September 2001; published 17 April 2002 It is shown that parametric down-conversion, with a short-duration pump pulse and a long nonlinear crystal that is appropriately phase matched, can produce a frequency-entangled biphoton state whose individual photons are coincident in frequency. Quantum interference experiments which distinguish this state from the familiar time-coincident biphoton state are described. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.183602
DOI:
10.1103/PhysRevLett.88.183602
PACS:
42.50.Dv, 03.65.Ud, 03.67.-a, 42.25.Hz
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