Quantum Cryptography using entangled photons in energy-time Bell states

Abstract

We present a setup for quantum cryptography based on photon pairs in energy-time Bell states and show its feasability 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 4-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.

4 pages including 2 figures

References in corpus (4)

• Experimental quantum teleportation
• Quantum Cryptography with Entangled Photons
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• Fast and User-friendly Quantum Key Distribution

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