PIRSA:12060075

Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve

(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}}
          }
Talk number
PIRSA:12060075
Collection
Talk Type
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.