1 August 2002 Conditional optimization in the four-state protocol of quantum cryptography
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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.
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Howard E. Brandt, Howard E. Brandt, } "Conditional optimization in the four-state protocol of quantum cryptography", Proc. SPIE 4732, Photonic and Quantum Technologies for Aerospace Applications IV, (1 August 2002); doi: 10.1117/12.477424; https://doi.org/10.1117/12.477424

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