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Waveguide-based OPO source of entangled photon pairs

Thew, Robert
Schreiber, Gerhard
Thomas, Abu
Sohler, Wolfgang
Published in New Journal of Physics. 2009, vol. 11, no. 113042
Abstract In this paper, we present a compact source of narrow-band energy–time-entangled photon pairs in the telecom regime based on a Ti-indiffused periodically poled lithium niobate (PPLN) waveguide resonator, i.e. a waveguide with end-face dielectric multi-layer mirrors. This is a monolithic doubly resonant optical parametric oscillator (OPO) far below threshold, which generates photon pairs by spontaneous parametric down-conversion (SPDC) at around 1560 nm with a 117 MHz (0.91 pm)-bandwidth. A coherence time of 2.7 ns is estimated by a time correlation measurement and a high quality of the entangled states is confirmed by a Bell-type experiment. Since highly coherent energy–time-entangled photon pairs in the telecom regime are suitable for long distance transmission and manipulation, this source is well suited to the requirements of quantum communication.
Stable URL http://archive-ouverte.unige.ch/unige:11679
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Other version: http://iopscience.iop.org/1367-2630/11/11/113042/
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