4.4 Article

Closed timelike curves and chronology protection in quantum and classical simulators

Journal

CLASSICAL AND QUANTUM GRAVITY
Volume 37, Issue 4, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1361-6382/ab5f3f

Keywords

quantum simulation; closed timelike curves; quantum field theory in curved spacetime

Funding

  1. Postdoctoral Junior Leader Fellowship Programme from `la Caixa' Banking Foundation [LCF/BQ/LR18/11640005]
  2. Fundacion General CSIC (ComFuturo Programme)

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In principe, general relativity seems to allow the existence of closed timelike curves (CTC). However, when quantum effects are considered, it is likely that their existence is prevented by some kind of chronological protection mechanism, as Hawking conjectured. Confirming or refuting the conjecture would require a full quantum theory of gravity. Meanwhile, the use of simulations could shed some light on this issue. We propose simulations of CTCs in a quantum system as well as in a classical one. In the quantum simulation, some restrictions appear that are not present in the classical setup, which could be interpreted as an analogue of a chronology protection mechanism.

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