An information-theoretical treatment of nonlocal PMD compensation

Gabriele Riccardi; Brian T. Kirby; Cristian Antonelli; Michael Brodsky

doi:10.1117/12.2546523

28 February 2020 An information-theoretical treatment of nonlocal PMD compensation

Gabriele Riccardi, Brian T. Kirby, Cristian Antonelli, Michael Brodsky

Proceedings Volume 11295, Advanced Optical Techniques for Quantum Information, Sensing, and Metrology; 112950T (2020) https://doi.org/10.1117/12.2546523
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

We present a study of nonlocal polarization-mode dispersion (PMD) compensation in the framework of quantum information theory. We consider distribution of polarization-entangled photon pairs through optical fibers, where PMD acts as a decoherence mechanism. The use of additional controlled PMD in one of the two optical paths can restore the original degree of entanglement fully or in part, depending on the system configuration, in a nonlocal fashion. Using the quantum analog of the Shannon entropy, the Von Neumann entropy, we evaluate the quantum mutual information of propagated polarization-entangled photon pairs as a function of the fiber-channel PMD, and quantify the beneficial effect of nonlocal PMD compensation in terms of mutual quantum information restoration. All the relevant quantities can be extracted from the reduced density matrix characterizing the twophoton state polarization, which is obtained experimentally by means of customary polarization tomography.

Conference Presentation

Citation Download Citation

Gabriele Riccardi, Brian T. Kirby, Cristian Antonelli, and Michael Brodsky "An information-theoretical treatment of nonlocal PMD compensation", Proc. SPIE 11295, Advanced Optical Techniques for Quantum Information, Sensing, and Metrology, 112950T (28 February 2020); https://doi.org/10.1117/12.2546523

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