Abstract
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.
- Received 26 September 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.183602
©2002 American Physical Society