Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4733-4736Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4733
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Using polarization-entangled photons from spontaneous parametric down-conversion, 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-nondemolition measurements. In all cases, the eavesdropper's presence was readily apparent. We discuss a procedure to increase her detectability.
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