Entangled state quantum cryptography: Eavesdropping on the Ekert protocol

Details Entangled state quantum cryptography: Eavesdropping on the Ekert protocol Entangled state quantum cryptography: Eavesdropping on the Ekert protocol

1999-12-23

arxiv.org/abs/quant-ph/9912105v1

Physical Review Letters 84, 4733-4736 (2000).

Physics

Quantum Physics

4 pages, 2 encapsulated postscript files, PRL (tentatively) accepted

Scientific paper

10.1103/PhysRevLett.84.4733

Using polarization-entangled photons from spontaneous parametric downconversion, we have implemented Ekert's quantum cryptography protocol. The near-perfect correlations of the photons allow the sharing of a secret key between two parties. The presence of an eavesdropper is continually checked by measuring Bell's inequalities. We investigated several possible eavesdropper strategies, including pseudo-quantum non-demolition measurements. In all cases, the eavesdropper's presence was readily apparent. We discuss a procedure to increase her detectability.

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