Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.16: Poster
Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG
Quenching on the circle: how compactification curbs entanglement growth in coupled rotors — •Stefan Aimet1 and Spyros Sotiriadis2 — 1Freie Universität Berlin, Berlin, Germany — 2University of Crete, Heraklion, Greece
Compact topology fundamentally constrains quantum dynamics. After a global frequency quench to zero, coupled harmonic oscillators display unbounded entanglement growth because their position variables live on the real line and the associated metastable zero modes diffuse indefinitely. Recasting these variables instead as angular coordinates compactified on a circle maps the system to coupled quantum rotors whose phase-space support and hence entanglement entropy saturates at late times. We analyse how compactification curbs entanglement growth. Our findings identify compactification as a generic mechanism that tames entanglement divergence and motivate experimental realisations.
Keywords: quench; entanglement; compact; coupled rotor; quantum