Two-photon coincident-frequency-entanglement via extended phase matching

Details Two-photon coincident-frequency-entanglement via extended phase matching Two-photon coincident-frequency-entanglement via extended phase matching

2004-10-26

arxiv.org/abs/quant-ph/0410216v2

PRL vol.94 p.083601 (2005)

Physics

Quantum Physics

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.94.083601

We demonstrate a new class of frequency-entangled states generated via spontaneous parametric down-conversion under extended phase matching conditions. Biphoton entanglement with coincident signal and idler frequencies is observed over a broad bandwidth in periodically poled KTiOPO$_4$. We demonstrate high visibility in Hong-Ou-Mandel interferometric measurements under pulsed pumping without spectral filtering, which indicates excellent frequency indistinguishability between the down-converted photons. The coincident-frequency entanglement source is useful for quantum information processing and quantum measurement applications.

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