Optimal quantum repeaters for qubits and qudits
量子物理
2009-11-11 v2
摘要
A class of optimal quantum repeaters for qubits is suggested. The schemes are minimal, i.e. involve a single additional probe qubit, and optimal, i.e. 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 higher dimensional signals (qudits) is straightforward.
引用
@article{arxiv.quant-ph/0501061,
title = {Optimal quantum repeaters for qubits and qudits},
author = {Marco G. Genoni and Matteo G. A. Paris},
journal= {arXiv preprint arXiv:quant-ph/0501061},
year = {2009}
}
备注
Revised version. To appear in PRA