Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster – Quantum Systems

Q 43.7: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG

Floquet theory for quantum systems driven by nonclassical light fields — •Vladislav Sukharnikov and Frank Schlawin — Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Controlling properties of materials by periodic drive has become an important research frontier, typically referred to as Floquet engineering. It has already enabled many advances in condensed-matter physics, such as inducing topological effects and nontrivial energy bands. Here, we explore Floquet engineering when the drive is a quantum light field. This introduces additional degrees of freedom and opens new possibilities for manipulating matter far from equilibrium.

We analyze how a nonclassical drive--for example, a bright squeezed vacuum--alters the properties of periodically driven quantum systems. Building on a previously developed approach to open-system dynamics [arXiv:2511.01358], we recast the interaction between a quantum system and a squeezed light into a time-local master equation with periodic coefficients. This framework allows us to study how time-periodic driving reshapes the effective Hamiltonians of quantum materials through Floquet engineering. We examine drive-induced correlations and analyze the potential for enhancing effects achievable with classical light.

Keywords: Floquet engineering; Squeezed light; Open quantum system