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Cryptographic Distinguishability Measures for Quantum Mechanical States
Christopher A. Fuchs, Jeroen van de Graaf
This paper, mostly expository in nature, surveys four measures of distinguishability for quantum-mechanical states. This is done from the point of view of the cryptographer with a…
Optimal Universal and State-Dependent Quantum Cloning
D. Bruss, D. P. DiVincenzo, A. Ekert +3
We establish the best possible approximation to a perfect quantum cloning machine which produces two clones out of a single input. We analyze both universal and state-dependent clo…
Nonorthogonal Quantum States Maximize Classical Information Capacity
Chistopher A. Fuchs
I demonstrate that, rather unexpectedly, there exist noisy quantum channels for which the optimal classical information transmission rate is achieved only by signaling alphabets co…
Optimal Eavesdropping in Quantum Cryptography. I
Christopher A. Fuchs, Nicolas Gisin, Robert B. Griffiths +2
We consider the Bennett-Brassard cryptographic scheme, which uses two conjugate quantum bases. An eavesdropper who attempts to obtain information on qubits sent in one of the bases…