Dynamics of entanglement and the Schmidt gap in a driven light-matter system

F. J. Gómez-Ruiz, J. J. Mendoza-Arenas, O. L. Acevedo, F. J. Rodŕguez, L. Quiroga, Neil F Johnson

Research output: Contribution to journalReview article

Abstract

The ability to modify light-matter coupling in time (e.g. using external pulses) opens up the exciting possibility of generating and probing new aspects of quantum correlations in many-body light-matter systems. Here we study the impact of such a pulsed coupling on the light-matter entanglement in the Dicke model as well as the respective subsystem quantum dynamics. Our dynamical many-body analysis exploits the natural partition between the radiation and matter degrees of freedom, allowing us to explore time-dependent intra-subsystem quantum correlations by means of squeezing parameters, and the inter-subsystem Schmidt gap for different pulse duration (i.e. ramping velocity) regimes - from the near adiabatic to the sudden quench limits. Our results reveal that both types of quantities indicate the emergence of the superradiant phase when crossing the quantum critical point. In addition, at the end of the pulse light and matter remain entangled even though they become uncoupled, which could be exploited to generate entangled states in non-interacting systems.

Original languageEnglish (US)
Article number024001
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume51
Issue number2
DOIs
StatePublished - Jan 28 2018

Keywords

  • entanglement
  • Non-equilibrium Dicke model
  • Schmidt gap
  • squeezing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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    Gómez-Ruiz, F. J., Mendoza-Arenas, J. J., Acevedo, O. L., Rodŕguez, F. J., Quiroga, L., & Johnson, N. F. (2018). Dynamics of entanglement and the Schmidt gap in a driven light-matter system. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(2), [024001]. https://doi.org/10.1088/1361-6455/aa9a92