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Cross time-bin photonic entanglement for quantum key distribution

A. Martin1, F. Kaiser1, A. Vernier1,*, A. Beveratos2, V. Scarani3,4, and S. Tanzilli1,†

  • 1Laboratoire de Physique de la Matière Condensée, CNRS UMR 7336, Université de Nice - Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France
  • 2Laboratoire de Photonique et Nanostructures, LPN-CNRS UPR20, Route de Nozay, F-91460 Marcoussis, France
  • 3Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543
  • 4Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542

  • *Present address: Laboratoire Charles Fabry, Institut d'Optique Graduate School, Palaiseau, France.
  • †sebastien.tanzilli@unice.fr
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Phys. Rev. A 87, 020301(R) – Published 4 February, 2013

DOI: https://doi.org/10.1103/PhysRevA.87.020301

Abstract

We report a fully fibered source emitting cross time-bin-entangled photons at 1540 nm from type-II spontaneous parametric down-conversion. Compared to standard time-bin-entanglement realizations, the preparation interferometer requires no phase stabilization, simplifying its implementation in quantum key distribution experiments. Bell-type tests of such a cross time-bin state are performed in the Franson configuration and lead to two-photon interference raw visibilities greater than 95%, which are only limited by the dark counts in the detectors and imperfections in the analysis system. Just by trusting the randomness of the beam splitters, the correlations generated by the source can be proved of nonclassical origin even in a passive implementation. The obtained results confirm the suitability of this source for time-bin-based quantum key distribution.

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Phys. Rev. A 87, 020301(R)– Published 4 February, 2013
  • Received 27 July 2012

©2013 American Physical Society

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