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Title: Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol

Abstract

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. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1]
  1. Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. (Australia)
Publication Date:
OSTI Identifier:
20216598
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 84; Journal Issue: 20; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; QUANTUM MECHANICS; PHOTONS; POLARIZATION; BELL THEOREM; SECRECY PROTECTION; THEORETICAL DATA

Citation Formats

Naik, D. S., Peterson, C. G., White, A. G., Department of Physics, University of Queensland, Brisbane, Queensland 4072,, Berglund, A. J., and Kwiat, P. G. Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol. United States: N. p., 2000. Web. doi:10.1103/PhysRevLett.84.4733.
Naik, D. S., Peterson, C. G., White, A. G., Department of Physics, University of Queensland, Brisbane, Queensland 4072,, Berglund, A. J., & Kwiat, P. G. Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol. United States. doi:10.1103/PhysRevLett.84.4733.
Naik, D. S., Peterson, C. G., White, A. G., Department of Physics, University of Queensland, Brisbane, Queensland 4072,, Berglund, A. J., and Kwiat, P. G. Mon . "Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol". United States. doi:10.1103/PhysRevLett.84.4733.
@article{osti_20216598,
title = {Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol},
author = {Naik, D. S. and Peterson, C. G. and White, A. G. and Department of Physics, University of Queensland, Brisbane, Queensland 4072, and Berglund, A. J. and Kwiat, P. G.},
abstractNote = {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. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevLett.84.4733},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 84,
place = {United States},
year = {2000},
month = {5}
}