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Proceedings Paper

Single-photon correlations for secure communication
Author(s): Maria Tengner; Daniel Ljunggren; Sébastien Sauge; Johan Waldebäck; Anders Karlsson
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Paper Abstract

We present two types of photon sources designed for secure quantum communication, e.g. for quantum cryptography. Both types are based on the creation of photon pairs by spontaneous parametric downconversion in nonlinear crystals. The first is a heralded single photon source and the second is a source of polarization-entangled photon pairs. For the heralded single photon source the detection of one of the photons of a downconversion pair is used as a trigger to announce the presence of the other: the single photon. The source is characterized by a highly sub-Poisson photon number statistics making it very suitable for use in quantum cryptography protocols using single photonic qubits to create correlated information between a sender and a receiver. The entanglement source instead uses the inherent non-classical correlations between entangled qubits. We also present a hybrid-encoding where the sender uses polarization to encode information while the receiver uses time-bins. Both sources create photons with highly non-degenerate wavelengths of 810 nm and 1550 nm, taking advantage of the efficient detectors at near-infrared and the low transmission loss of optical fibers at telecommunication wavelengths.

Paper Details

Date Published: 13 October 2006
PDF: 9 pages
Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 63990F (13 October 2006); doi: 10.1117/12.689780
Show Author Affiliations
Maria Tengner, Royal Institute of Technology-KTH (Sweden)
Daniel Ljunggren, Royal Institute of Technology-KTH (Sweden)
Sébastien Sauge, Royal Institute of Technology-KTH (Sweden)
Johan Waldebäck, Royal Institute of Technology-KTH (Sweden)
Anders Karlsson, Royal Institute of Technology-KTH (Sweden)


Published in SPIE Proceedings Vol. 6399:
Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays
Lars J. Sjöqvist; Rebecca Wilson, Editor(s)

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