Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions

• URL: http://arxiv.org/abs/2504.17731v1
• Date: Thu, 24 Apr 2025 16:44:07 GMT
• Title: Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions
• Authors: Gabriele Natale, Alexander Baumgärtner, Justyna Stefaniak, David Baur, Simon Hertlein, Dalila Rivero, Tilman Esslinger, Tobias Donner,
• Abstract summary: Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases.<n>We develop a cavity-assisted Bragg spectroscopy technique to resolve its collective modes.<n>This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.
• Score: 34.82692226532414
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective non-equilibrium behavior. We study such a transition in a Bose-Einstein condensate coupled to an optical cavity and develop a cavity-assisted Bragg spectroscopy technique to resolve its collective modes. We observe dissipation-induced synchronization at the quasiparticle level, where two roton-like modes coalesce at an exceptional point. This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.

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