Phys. Rev. Lett. 84, 4733–4736 (2000)

Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol

Abstract

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D. S. Naik¹, C. G. Peterson¹, A. G. White^1,2, A. J. Berglund¹, and P. G. Kwiat^1,*
¹Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
²Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia

Received 18 October 1999; published in the issue dated 15 May 2000

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.84.4733

DOI:

10.1103/PhysRevLett.84.4733

PACS:

03.67.Dd, 03.65.Bz, 42.79.Sz

^*To whom all correspondence should be addressed.Electronic address: Kwiat@lanl.gov

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Phys. Rev. Lett. 84, 4733–4736 (2000)

Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol