No signalling and probabilistic quantum
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Lucien Hardy; David D Song
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Article
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1999
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Elsevier Science
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English
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We show that the condition of no faster-than-light signalling restricts the number of quantum states that can be cloned in ลฝ . a given Hilbert space. This condition leads to the constraints on a probabilistic quantum cloning machine PQCM recently found by Duan and Guo.