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Quantum Cryptography Using Entangled Photons in Energy-Time Bell States

Published inPhysical review letters, vol. 84, no. 20, p. 4737-4740
Publication date2000
Abstract

We present a setup for quantum cryptography based on photon pairs in energy-time Bell states and show its feasibility in a laboratory experiment. Our scheme combines the advantages of using photon pairs instead of faint laser pulses and the possibility to preserve energy-time entanglement over long distances. Moreover, using four-dimensional energy-time states, no fast random change of bases is required in our setup: Nature itself decides whether to measure in the energy or in the time base, thus rendering eavesdropper attacks based on “photon number splitting” less efficient.

Citation (ISO format)
TITTEL, Wolfgang et al. Quantum Cryptography Using Entangled Photons in Energy-Time Bell States. In: Physical review letters, 2000, vol. 84, n° 20, p. 4737–4740. doi: 10.1103/PhysRevLett.84.4737
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ISSN of the journal0031-9007
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