Quantum-state cloning in the presence of a closed timelike curve

D. Ahn, C. R. Myers, T. C. Ralph, and R. B. Mann
Phys. Rev. A 88, 022332 – Published 26 August 2013

Abstract

Using the Deutsch model of closed timelike curves, we show that a universal cloner can be constructed that when acting on a completely arbitrary qubit state, exceeds the no-cloning bound for 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 that behave according to Deutsch's model would radically change the rules for quantum information technology. Nevertheless, we show that this type of cloning does not violate no-signaling criteria.

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  • Received 25 July 2012

DOI:https://doi.org/10.1103/PhysRevA.88.022332

©2013 American Physical Society

Authors & Affiliations

D. Ahn1,*, C. R. Myers2,†, T. C. Ralph3, and R. B. Mann4,‡

  • 1Centre for Quantum Information Processing, Department of Electrical and Computer Engineering, University of Seoul, Seoul 130-743, Republic of Korea
  • 2Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, St. Lucia, 4072 Queensland, Australia
  • 3Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland, St. Lucia, 4072 Queensland, Australia
  • 4Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

  • *dahn@uos.ac.kr
  • myers@physics.uq.edu.au
  • rbmann@uwaterloo.ca

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Vol. 88, Iss. 2 — August 2013

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