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Optimal ancilla-free phase-covariant telecloning of qudits via nonmaximally entangled states

We study the one-to-two phase-covariant telecloning of a qudit without ancilla. We show that the fidelity of the two clones can reach that of the clones in the optimal ancilla-based one-to-two phase-covariant cloning and telecloning, i.e., the limitation of quantum mechanics. More interestingly, it is a nonmaximally entangled state rather than the maximally entangled state that can be used to realize such a telecloning task.

preprint2011arXivOpen access
Xin-Wen WangGuo-Jian Yang
math-phmath.MPquant-ph
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Xin-Wen WangGuo-Jian Yang

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