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Performance Analysis for Brandt’s Conclusive Entangling Probe

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Abstract

The Fuchs–Peres–Brandt (FPB) probe realizes the most powerful individual attack on Bennett-Brassard 1984 quantum key distribution by means of a single controlled-NOT gate in which Alice’s transmitted qubit becomes the control-qubit input, Bob’s received qubit is the control-qubit output, and Eve supplies the target-qubit input and measures the target-qubit output. The FPB probe uses the minimum-error-probability projective measurement for discriminating between the target-qubit output states that are perfectly correlated with Bob’s sifted bit value when that bit is correctly received. This paper analyzes a recently proposed modification of the FPB attack in which Eve’s projective measurement is replaced by a probability operator-valued measurement chosen to unambiguously discriminate between the same two target-qubit output states.

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Authors and Affiliations

  1. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Jeffrey H. Shapiro

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  1. Jeffrey H. Shapiro
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Correspondence to Jeffrey H. Shapiro.

Additional information

PACS: 03.67.Dd, 03.67.Hk, 03.65.Ta.

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Shapiro, J.H. Performance Analysis for Brandt’s Conclusive Entangling Probe. Quantum Inf Process 5, 11–24 (2006). https://doi.org/10.1007/s11128-005-0005-y

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  • DOI: https://doi.org/10.1007/s11128-005-0005-y

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