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Quantum history cannot be copied. (English) Zbl 1195.81013

Summary: We show that unitarity does not allow cloning of any two points in a ray. This has implication for cloning of the geometric phase information in a quantum state. In particular, the quantum history which is encoded in the geometric phase during cyclic evolution of a quantum system cannot be copied. We also prove that the generalized geometric phase information cannot be copied by a unitary operation. We argue that our result also holds in the consistent history formulation of quantum mechanics.

MSC:

81P05 General and philosophical questions in quantum theory
81P68 Quantum computation

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