(2012). Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve . Perimeter Institute for Theoretical Physics. https://pirsa.org/12060075
MLA
Any Quantum State Can be Cloned in the Presence of a Closed Timelike Curve . Perimeter Institute for Theoretical Physics, Jun. 28, 2012, https://pirsa.org/12060075
BibTex
@misc{ scivideos_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 for Theoretical Physics},
year = {2012},
month = {jun},
note = {PIRSA:12060075 see, \url{https://scivideos.org/index.php/pirsa/12060075}}
}
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.
