PIRSA:12060075 Conference

DOI10.48660/12060075

Conference/School: Relativistic Quantum Information - 2012

(2012). Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve . Perimeter Institute. https://pirsa.org/12060075

Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve . Perimeter Institute, Jun. 28, 2012, https://pirsa.org/12060075 

@misc{ pirsa_PIRSA:12060075,
  doi = {10.48660/12060075},
  url = {https://pirsa.org/12060075},
  author = {},
  keywords = {},
  language = {en},
  title = {Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve },
  publisher = {Perimeter Institute},
  year = {2012},
  month = {jun},
  note = {PIRSA:12060075 see, \url{https://pirsa.org}}
}

Abstract

Using the Deutsch approach, we show that the no-cloning theorem can be circumvented in the presence of closed timelike curves, allowing the perfect cloning of a quantum state chosen randomly from a finite alphabet of states. Further, we show that a universal cloner can be constructed that when acting on a completely arbitrary qubit state, exceeds the no-cloning bound on fidelity. Since the “no cloning theorem” has played a central role in the development of quantum information science, it is clear that the existence of closed timelike curves would radically change the rules for quantum information technology.

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