Phys. Rev. Lett. 94, 083601 (2005) [4 pages]Two-Photon Coincident-Frequency Entanglement via Extended Phase MatchingSee Also: Erratum Received 26 October 2004; published 1 March 2005 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 KTiOPO4. 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.083601
DOI:
10.1103/PhysRevLett.94.083601
PACS:
42.50.Dv, 03.65.Ud, 03.67.Mn
See AlsoErratum: Onur Kuzucu, Marco Fiorentino, Marius A. Albota, Franco N. Wong, and Franz X. Kärtner, Erratum: Two-Photon Coincident-Frequency Entanglement via Extended Phase Matching [Phys. Rev. Lett. 94, 083601 (2005)], Phys. Rev. Lett. 94, 169903 (2005). |
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