Feedback-Induced Quantum Phase Transitions Using Weak Measurements

D. A. Ivanov, T. Yu. Ivanova, S. F. Caballero-Benitez, and I. B. Mekhov
Phys. Rev. Lett. 124, 010603 – Published 6 January 2020
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Abstract

We show that applying feedback and weak measurements to a quantum system induces phase transitions beyond the dissipative ones. Feedback enables controlling essentially quantum properties of the transition, i.e., its critical exponent, as it is driven by the fundamental quantum fluctuations due to measurement. Feedback provides the non-Markovianity and nonlinearity to the hybrid quantum-classical system, and enables simulating effects similar to spin-bath problems and Floquet time crystals with tunable long-range (long-memory) interactions.

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  • Received 1 April 2019
  • Revised 15 September 2019

DOI:https://doi.org/10.1103/PhysRevLett.124.010603

© 2020 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsAtomic, Molecular & Optical

Authors & Affiliations

D. A. Ivanov1, T. Yu. Ivanova1, S. F. Caballero-Benitez2, and I. B. Mekhov1,3,4,*

  • 1Department of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia
  • 2Instituto de Física, Universidad Nacional Autónoma de México, Ciudad de Mexico 04510, Mexico
  • 3Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
  • 4SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France

  • *Igor.B.Mekhov@gmail.com

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Issue

Vol. 124, Iss. 1 — 10 January 2020

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