Generating Entangled Two-Photon States with Coincident Frequencies
Vittorio Giovannetti, Lorenzo Maccone, Jeffrey H. Shapiro, Franco N. C. Wong
Abstract
It is shown that parametric downconversion, 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.
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