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Proceedings Paper

Conditional optimization in the four-state protocol of quantum cryptography
Author(s): Howard E. Brandt
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Paper Abstract

Following a review of the probe optimization of Slutsky, Sun, Rao, and Fainman [Phys. Rev. A 57, 2383 (1998)] for the standard four-state protocol of quantum key distribution, I generalize the optimization to variable angle between the signal bases. I calculate the corresponding maximum Renyi information gain by the probe, and determine the optimum probe parameters. A larger set of optimum probe parameters is found for the standard protocol than was known previously.

Paper Details

Date Published: 1 August 2002
PDF: 23 pages
Proc. SPIE 4732, Photonic and Quantum Technologies for Aerospace Applications IV, (1 August 2002); doi: 10.1117/12.477424
Show Author Affiliations
Howard E. Brandt, Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 4732:
Photonic and Quantum Technologies for Aerospace Applications IV
Eric Donkor; Michael J. Hayduk; Andrew R. Pirich; Edward W. Taylor; Andrew R. Pirich; Eric Donkor, Editor(s)

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