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Phys Rev Lett. 2000 May 15;84(20):4737-40.

Quantum cryptography using entangled photons in energy-time bell states

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1
Group of Applied Physics, University of Geneva, CH-1211, Geneva 4, Switzerland.

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.

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