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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.45: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
Generation of Narrow-Band Polarization-Entangled Photon Pairs for Atomic Quantum Memories — •Xiao-Hui Bao1,2, Yong Qian1, Jian Yang1, Han Zhang1, Zeng-Bing Chen1, Tao Yang1,2, and Jian-Wei Pan1,2 — 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China — 2Physikalisches Institut der Universitaet Heidelberg, Philosophenweg 12, Heidelberg 69120, Germany
We report an experimental realization of a narrow-band polarization-entangled photon source with a linewidth of 9.6 MHz through cavity-enhanced spontaneous parametric down-conversion. This linewidth is comparable to the typical linewidth of atomic ensemble based quantum memories. Single-mode output is realized by setting a reasonable cavity length difference between different polarizations, using of temperature controlled etalons and actively stabilizing the cavity. The entangled property is characterized with quantum state tomography, giving a fidelity of 94% between our state and a maximally entangled state. The coherence length is directly measured to be 32 m through two-photon interference.