9801005v1

related topics
{states, state, optimal}
{bell, inequality, local}
{state, states, entangled}
{particle, mechanics, theory}
{state, phys, rev}
{observables, space, algebra}
{key, protocol, security}

Quantum cloning without signaling

Nicolas Gisin

abstract: Perfect Quantum Cloning Machines (QCM) would allow to use quantum nonlocality for arbitrary fast signaling. However perfect QCM cannot exist. We derive a bound on the fidelity of QCM compatible with the no-signaling constraint. This bound equals the fidelity of the Bu\v{z}ek-Hillery QCM.

oai_identifier:
oai:arXiv.org:quant-ph/9801005
categories:
quant-ph
doi:
10.1016/S0375-9601(98)00170-4
arxiv_id:
quant-ph/9801005
journal_ref:
Phys.Lett. A242 (1998) 1-3
created:
1998-01-06

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