Indefinite causal order with fixed temporal order for electrons and positrons

• URL: http://arxiv.org/abs/2202.12886v2
• Date: Wed, 2 Mar 2022 16:06:37 GMT
• Title: Indefinite causal order with fixed temporal order for electrons and positrons
• Authors: Aur\'elien Drezet
• Abstract summary: We show that genuine implementations of the paradigmatic quantum switch, but here violating some causal inequalities and with a fixed temporal order, become possible in extreme external electromagnetic field conditions allowing the presence of closed time-like curves.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We provide an analysis of indefinite causal orders in relativistic quantum mechanics based on the electron-positron picture of Feynman involving negative energy electrons moving backward in time. We show that genuine implementations of the paradigmatic quantum switch, but here violating some causal inequalities and with a fixed temporal order, become possible in extreme external electromagnetic field conditions allowing the presence of closed time-like curves.

Related papers

• Longitudinal Momentum Spectra of pair created in a pulsed field at finite times: Are Oscillations "Real" [0.0]
  We analytically compute the probability of $(e+ e-) $pair production in momentum space. We compare the result with quantum kinetic theory (QKT) Both approaches allow us to study the particle momentum spectrum at any instant in time.
  arXiv  Detail & Related papers  (2024-05-05T14:28:05Z)
• Quantum particle under dynamical confinement: From quantum Fermi acceleration to high harmonic generation [0.0]
  Quantum dynamics of a particle confined in a box with time-dependent wall is revisited. Time-dependence of the average kinetic energy and average quantum force is analyzed. A model for optical high harmonic generation in the presence of dynamical confinement and external linearly polarized monochromatic field is proposed.
  arXiv  Detail & Related papers  (2023-09-27T03:57:33Z)
• Electron Scattering at a Potential Temporal Step Discontinuity [0.27624021966289597]
  We show that the Schrodinger equation cannot account for scattering in this problem. We derive the scattering probabilities, of later forward and backward nature, with the later-backward wave being a relativistic effect.
  arXiv  Detail & Related papers  (2023-07-16T17:33:17Z)
• Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
  Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Such states could be realized in the waveguide quantum electrodynamics platform.
  arXiv  Detail & Related papers  (2023-03-17T09:27:02Z)
• Observation of Time-Crystalline Eigenstate Order on a Quantum Processor [80.17270167652622]
  Quantum-body systems display rich phase structure in their low-temperature equilibrium states. We experimentally observe an eigenstate-ordered DTC on superconducting qubits. Results establish a scalable approach to study non-equilibrium phases of matter on current quantum processors.
  arXiv  Detail & Related papers  (2021-07-28T18:00:03Z)
• Chaotic Einstein-Podolsky-Rosen pairs, measurements and time reversal [0.0]
  We consider a situation when evolution of an entangled Einstein-Podolsky-Rosen (EPR) pair takes place in a regime of quantum chaos being chaotic in the classical limit. The time evolution is reversible even if a presence of small errors breaks time reversal of classical dynamics. We show that due to EPR pair entanglement a measurement of one particle at the moment of time reversal breaks exact time reversal of another particle which demonstrates only an approximate time reversibility.
  arXiv  Detail & Related papers  (2021-06-06T20:59:43Z)
• The Time-Evolution of States in Quantum Mechanics [77.34726150561087]
  It is argued that the Schr"odinger equation does not yield a correct description of the quantum-mechanical time evolution of states of isolated (open) systems featuring events. A precise general law for the time evolution of states replacing the Schr"odinger equation is formulated within the so-called ETH-Approach to Quantum Mechanics.
  arXiv  Detail & Related papers  (2021-01-04T16:09:10Z)
• Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
  We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
  arXiv  Detail & Related papers  (2020-11-24T07:06:36Z)
• Quantum potential in dust collapse with a negative cosmological constant [0.0]
  We obtain the wave function describing collapsing dust in an anti-de Sitter background, as seen by a co-moving observer. We perform a causal de Broglie-Bohm analysis, and obtain the corresponding quantum potential. An initially collapsing solution with a negative cosmological constant bounces back after reaching a minimum radius.
  arXiv  Detail & Related papers  (2020-07-21T17:43:02Z)
• Equivalence of approaches to relational quantum dynamics in relativistic settings [68.8204255655161]
  We show that the trinity' of relational quantum dynamics holds in relativistic settings per frequency superselection sector. We ascribe the time according to the clock subsystem to a POVM which is covariant with respect to its (quadratic) Hamiltonian.
  arXiv  Detail & Related papers  (2020-07-01T16:12:24Z)
• General quantum-mechanical solution for twisted electrons in a uniform magnetic field [68.8204255655161]
  A theory of twisted (and other structured) paraxial electrons in a uniform magnetic field is developed. The observable effect of a different behavior of relativistic Laguerre-Gauss beams with opposite directions of the orbital angular momentum penetrating from the free space into a magnetic field is predicted.
  arXiv  Detail & Related papers  (2020-05-13T16:35:10Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.