2012/08/08 by Zhi‐Yuan Zhou, Zhi-Yuan Zhou, Zhou, Zhi-Yuan +12
Computer Science · Engineering · Physics and Astronomy · #Photonic and Optical Devices #Quantum Information and Cryptography #Quantum optics and atomic interactions #physics.optics #quant-ph
paper · pdf · doi:10.48550/arxiv.1208.1638
11 pages, 7 figures
arxiv created 2013/02/23 · arxiv updated 2013/02/26
In this paper, we present a narrow bandwidth source at the telecom wavelength based on type II PPKTP crystal inside an optical cavity. Simultaneous resonances of the pump and the two down-converted fields are achieved by special design of the cavity. This is a triple resonances optical parametric oscillator (OPO) far below threshold, which generates photon pairs at around 1560 nm with a bandwidth of 8 MHz. A coherence time of 27.7 ns is estimate by a time correlation measurement, and the estimated photon pairs generating rate is 134 s-1MHz-1mW-1. As entangled photon pairs in the telecom regime is suitable for long distance transmission and manipulation, this source is desirable for the demands of quantum communication.