Heralded Generation of Ultrafast Single Photons in Pure Quantum States

Details Heralded Generation of Ultrafast Single Photons in Pure Quantum States Heralded Generation of Ultrafast Single Photons in Pure Quantum States

2007-11-07

arxiv.org/abs/0711.1054v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.133601

We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric downconversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources, and, by performing a Hong-Ou-Mandel interference between them without spectral filters at a raw visibility of 94.4%, their purity was measured to be over 95%.

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