Performance Analysis for Brandt’s Conclusive Entangling Probe |
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Authors: | Jeffrey H. Shapiro |
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Affiliation: | (1) Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
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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. PACS: 03.67.Dd, 03.67.Hk, 03.65.Ta. |
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Keywords: | Quantum cryptography quantum key distribution quantum computation entanglement |
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