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Proceedings Paper

New results on entangled translucent eavesdropping in quantum cryptography
Author(s): Howard E. Brandt; John M. Myers; Samuel J. Lomonaco
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Paper Abstract

We present a mathematical physics analysis of entangled translucent eavesdropping in quantum cryptography, based on the recent work of Ekert, Huttner, Palma, and Peres. The key generation procedure involves the transmission, interception, and reception of two nonorthogonal photon polarization states. At the receiving end, a positive operator valued measure (POVM) is employed in the measurement process. The eavesdropping involves an information-maximizing von Neumann-type projective measurement. We propose a new design for a receiver that is an all-optical realization of the POVM, using a Wollaston prism, a mirror, two beam splitters, a polarization rotator, and three photodetectors. We present a quantitative analysis of the receiver. We obtain closed-form algebraic expressions for the error rates and mutual information, expressed in terms of the POVM-receiver error rate and the angle between the carrier polarization states. We also prove a significant result, namely, that in the entangled translucent eavesdropping approach, the unsafe error rate based on standard mutual information comparisons is equivalent to the maximum allowable error rate based on perfect mutual information for the eavesdropper. In this case, the above unsafe error rate is in fact not overly conservative.

Paper Details

Date Published: 1 July 1997
PDF: 17 pages
Proc. SPIE 3076, Photonic Quantum Computing, (1 July 1997); doi: 10.1117/12.277651
Show Author Affiliations
Howard E. Brandt, U.S. Army Research Lab. at Adelphi (United States)
John M. Myers, Harvard Univ. (United States)
Samuel J. Lomonaco, Univ. of Maryland/Baltimore County (United States)


Published in SPIE Proceedings Vol. 3076:
Photonic Quantum Computing
Steven P. Hotaling; Andrew R. Pirich, Editor(s)

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