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Phys Rev Lett. 2005 Mar 4;94(8):083601. Epub 2005 Mar 1.

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

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Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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  • Phys Rev Lett. 2005 Apr 29;94(16):169903.


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.

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