Experimental simulation of closed timelike curves.

  title={Experimental simulation of closed timelike curves.},
  author={Martin Ringbauer and Matthew A. Broome and Casey R. Myers and Andrew G. White and Timothy C. Ralph},
  journal={Nature communications},
Closed timelike curves are among the most controversial features of modern physics. As legitimate solutions to Einstein's field equations, they allow for time travel, which instinctively seems paradoxical. However, in the quantum regime these paradoxes can be resolved, leaving closed timelike curves consistent with relativity. The study of these systems therefore provides valuable insight into nonlinearities and the emergence of causal structures in quantum mechanics--essential for any… 

Closed timelike curves and the second law of thermodynamics

One out of many emerging implications from solutions of Einstein's general relativity equations are closed timelike curves (CTCs), which are trajectories through spacetime that loop back on

Quantum causality in closed timelike curves

Although general relativity allows the existence of closed timelike curves (CTCs), self-consistency problems arise (the ‘grandfather paradox’ among others). It is known that quantum mechanical

Theoretical description and experimental simulation of quantum entanglement near open time-like curves via pseudo-density operators

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Quantum Entanglement Near Open Timelike Curves

Closed timelike curves are striking predictions of general relativity allowing for time-travel. They are afflicted by notorious causality issues (e.g. grandfather’s paradox). Quantum models where a

Holographic dual of a time machine.

We apply the $AdS/CFT$ holography to the simplest possible eternal time machine solution in $AdS_3$ based on two conical defects moving around their center of mass along a circular orbit. Closed

Quantum Physics, Fields and Closed Timelike Curves: The D-CTC Condition in Quantum Field Theory

The D-CTC condition has originally been proposed by David Deutsch as a condition on states of a quantum communication network that contains “backward time-steps” in some of its branches. It has been

Closed Timelike Curves, Singularities and Causality: A Survey from Gödel to Chronological Protection

I give a historical survey of the discussions about the existence of closed timelike curves in general relativistic models of the universe, opening the physical possibility of time travel in the

The D-CTC Condition in Quantum Field Theory

  • R. Verch
  • Physics
    Progress and Visions in Quantum Theory in View of Gravity
  • 2020
A condition proposed by David Deutsch to describe analogues of processes in the presence of closed timelike curves (D-CTC condition) in bipartite quantum systems is investigated within the framework

The holographic glass bead game : from superconductivity to time machines

The thesis is devoted to applications of the anti de Sitter/Conformal field theory correspondence (AdS/CFT, also called holography) to various problems in different areas of theoretical physics. We



Quantum mechanics near closed timelike lines.

  • Deutsch
  • Physics
    Physical review. D, Particles and fields
  • 1991
Several novel and distinctive quantum-mechanical effects occur on and near closed timelike lines, including violations of the correspondence principle and of unitarity, and consideration of these sheds light on the nature of quantum mechanics.

Open timelike curves violate Heisenberg's uncertainty principle.

Remarkably, circuits with access to OTCs are shown to violate Heisenberg's uncertainty principle, allowing perfect state discrimination and perfect cloning of coherent states, and the model is extended to wave packets and smoothly recovers standard quantum mechanics in an appropriate physical limit.

Quantum computational complexity in the presence of closed timelike curves

Quantum computation with quantum data that can traverse closed timelike curves represents a new physical model of computation. We argue that a model of quantum computation in the presence of closed

Quantum Simulation of the Majorana Equation and Unphysical Operations

A quantum simulator is a device engineered to reproduce the properties of an ideal quantum model. It allows the study of quantum systems that cannot be efficiently simulated on classical computers.

The preparation problem in nonlinear extensions of quantum theory

Nonlinear modifications to the laws of quantum mechanics have been proposed as a possible way to consistently describe information processing in the presence of closed timelike curves. These have

Information flow of quantum states interacting with closed timelike curves

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Observation of topologically protected bound states in photonic quantum walks

  • T. KitagawaM. Broome Andrew G. White
  • Physics
    2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)
  • 2011
The study of topological phases does not have to remain limited to static or quasi-static/adiabatic situations, and can be extended to periodically driven systems, which have recently been proposed to also exhibit topological behaviors.

Quantum state cloning using Deutschian closed timelike curves.

We show that it is possible to clone quantum states to arbitrary accuracy in the presence of a Deutschian closed timelike curve (D-CTC), with a fidelity converging to one in the limit as the

Closed timelike curves via postselection: theory and experimental test of consistency.

An alternative quantum formulation of CTCs based on teleportation and postselection is analyzed, and it is shown that it is inequivalent to Deutsch's.

Simulating quantum effects of cosmological expansion using a static ion trap

We propose a new experimental test bed that uses ions in the collective ground state of a static trap to study the analogue of quantum-field effects in cosmological spacetimes, including the