Open Timelike Curves Violate Heisenberg’s Uncertainty Principle

J. L. Pienaar, T. C. Ralph, and C. R. Myers
Phys. Rev. Lett. 110, 060501 – Published 4 February 2013
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Abstract

Toy models for quantum evolution in the presence of closed timelike curves have gained attention in the recent literature due to the strange effects they predict. The circuits that give rise to these effects appear quite abstract and contrived, as they require nontrivial interactions between the future and past that lead to infinitely recursive equations. We consider the special case in which there is no interaction inside the closed timelike curve, referred to as an open timelike curve (OTC), for which the only local effect is to increase the time elapsed by a clock carried by the system. Remarkably, circuits with access to OTCs are shown to violate Heisenberg’s uncertainty principle, allowing perfect state discrimination and perfect cloning of coherent states. The model is extended to wave packets and smoothly recovers standard quantum mechanics in an appropriate physical limit. The analogy with general relativistic time dilation suggests that OTCs provide a novel alternative to existing proposals for the behavior of quantum systems under gravity.

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  • Received 1 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.060501

© 2013 American Physical Society

Authors & Affiliations

J. L. Pienaar* and T. C. Ralph

  • School of Mathematics and Physics, The University of Queensland, Brisbane, 4072 Queensland, Australia

C. R. Myers

  • Centre for Engineered Quantum Systems, The University of Queensland, St. Lucia, 4072 Queensland, Australia

  • *j.pienaar@physics.uq.edu.au
  • ralph@physics.uq.edu.au
  • myers@physics.uq.edu.au

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Issue

Vol. 110, Iss. 6 — 8 February 2013

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