Dissipation Induced Nonstationarity in a Quantum Gas

Berislav Buča and Dieter Jaksch
Phys. Rev. Lett. 123, 260401 – Published 23 December 2019
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Abstract

Nonstationary longtime dynamics was recently observed in a driven two-component Bose-Einstein condensate coupled to an optical cavity [N. Dogra, M. Landini, K. Kroeger, L. Hruby, T. Donner, and T. Esslinger, arXiv:1901.05974] and analyzed in mean-field theory. We solve the underlying model in the thermodynamic limit and show that this system is always dynamically unstable—even when mean-field theory predicts stability. Instabilities always occur in higher-order correlation functions leading to squeezing and entanglement induced by cavity dissipation. The dynamics may be understood as the formation of a dissipative time crystal. We use perturbation theory for finite system sizes to confirm the nonstationary behavior.

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  • Received 9 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.260401

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalStatistical Physics & ThermodynamicsQuantum Information, Science & Technology

Authors & Affiliations

Berislav Buča1 and Dieter Jaksch1,2

  • 1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
  • 2Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543

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Issue

Vol. 123, Iss. 26 — 31 December 2019

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