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Role of Absorption on the Generation of Quantum-Correlated Photon Pairs Through FWM

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2 Author(s)
Silva, N.A. ; Dept. of Electron., Telecommun. & Inf., Univ. of Aveiro, Aveiro, Portugal ; Pinto, A.N.

The impact of fiber absorption on the generation rate of quantum-correlated photon pairs through spontaneous four-wave mixing in optical fibers is studied theoretically. We quantify the impact of the loss through the analysis of the Cauchy-Schwarz correlation parameter and the Clauser, Horne, Shimony, and Holt inequality. Results show that fiber loss can improve the quantum-correlation between the photon pairs. This is a consequence of the decrease of the individual signal and idler photon-fluxes, which reduces the rate of uncorrelated photons generated through Raman scattering inside the optical fiber. Findings show that a high degree of polarization entanglement is obtained when the ratio of signal to idler photon-fluxes lies between 0.5 and 0.8, in a regime with high losses on the signal wave.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:48 ,  Issue: 11 )