Weak cloning of an unknown quantum state

Details Weak cloning of an unknown quantum state Weak cloning of an unknown quantum state

2005-06-15

arxiv.org/abs/quant-ph/0506119v2

Phys. Lett. A 354, 396 (2006)

Physics

Quantum Physics

Minor corrections, journal reference added

Scientific paper

10.1016/j.physleta.2006.01.075

The impossibility to clone an unknown quantum state is a powerful principle to understand the nature of quantum mechanics, especially within the context of quantum computing and quantum information. This principle has been generalized to quantitative statements as to what extent imperfect cloning is possible. We delineate an aspect of the border between the possible and the impossible concerning quantum cloning, by putting forward an entanglement-assisted scheme for simulating perfect cloning in the context of weak measurements. This phenomenon we call weak cloning of an unknown quantum state.

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