A class of optimal quantum repeaters for qubits is suggested. The schemes are minimal, i.e., they involve a single additional probe qubit, and optimal, i.e., they provide the maximum information adding the minimum amount of noise. Information gain and state disturbance are quantified by fidelities which, for our schemes, saturate the ultimate bound imposed by quantum mechanics for randomly distributed signals. Special classes of signals are also investigated, in order to improve the information-disturbance trade-off. Extension to higherdimensional signals

Optimal quantum repeaters for qubits and qudits / Marco G. Genoni, Matteo G. A. Paris. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 71:5(2005), pp. 052307.052307-1-052307.052307-5.

Optimal quantum repeaters for qubits and qudits

Marco G. Genoni;Matteo G. A. Paris
2005

Abstract

A class of optimal quantum repeaters for qubits is suggested. The schemes are minimal, i.e., they involve a single additional probe qubit, and optimal, i.e., they provide the maximum information adding the minimum amount of noise. Information gain and state disturbance are quantified by fidelities which, for our schemes, saturate the ultimate bound imposed by quantum mechanics for randomly distributed signals. Special classes of signals are also investigated, in order to improve the information-disturbance trade-off. Extension to higherdimensional signals
quantum information, information-disturbance tradeoff
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/9719
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