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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