Generation of Narrow-Band Polarization-Entangled Photon Pairs for Atomic Quantum Memories

Details Generation of Narrow-Band Polarization-Entangled Photon Pairs for Atomic Quantum Memories Generation of Narrow-Band Polarization-Entangled Photon Pairs for Atomic Quantum Memories

2008-06-30

arxiv.org/abs/0806.4788v2

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.190501

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.

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