Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 15: Many-Body Quantum Dynamics II

MON 15.3: Talk

Monday, September 8, 2025, 17:00–17:15, ZHG003

Creating NOON Wavepackets via Resonance and Chaos-Assisted Tunneling of Ultracold Atoms in a Ring — •Diego Morachis and Peter Schlagheck — CESAM Research Unit, University of Liège, 4000 Liège, Belgium

A way to generate microscopic quantum superpositions for repulsively interacting ultracold atoms confined in a ring-shaped trap is proposed. Periodically driving the system renders a mixed phase space where chaotic dynamics coexist with stable resonant islands. These islands act as effective double-well potentials, enabling the confinement of atoms in distinct wavepackets with the possibility of achieving states in a perferctly balanced superposition known as a NOON state. We explore the creation of such states by studying the evolution of experimentally feasible coherent states as initial wavepackets. Parameter sets enabling the self-trapping regime are identified, which suppresses individual tunneling and promotes collective tunneling as the dominant mechanism. By performing exact numerical simulations of the many-body dynamics, we characterize NOON state formation timescales for distinct particle numbers. Preliminary results suggest specific driving windows where this resonance and chaos-assisted approach may generate nonclassical states in atomic traps.

Keywords: NOON states; Superposition of wavepackets; Ultracold atoms; Resonance and chaos-assisted tunneling