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Shapiro, Jeffrey H.

Performance analysis for Brandt’s conclusive entangling probe. (English) Zbl 1119.81044

Quantum Inf. Process. 5, No. 1, 11-24 (2006).
Summary: 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.

Cited in 6 Documents

MSC:

81P68 Quantum computation
94A60 Cryptography
81P15 Quantum measurement theory, state operations, state preparations

Keywords:

Quantum cryptography; quantum key distribution; quantum computation; entanglement
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\textit{J. H. Shapiro}, Quantum Inf. Process. 5, No. 1, 11--24 (2006; Zbl 1119.81044)
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