Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 16: Collisions, Scattering and Correlation Phenomena I

A 16.1: Hauptvortrag

Mittwoch, 12. März 2025, 14:30–15:00, HS PC

Entanglement in the motional degree of freedom created in ultracold collisions — •Yimeng Wang and Christiane Koch — Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Despite cold collisions being one of the most important tools of demonstrating quantum features and manipulating the particles, entanglement generated during the cold collision processes has been comprehensively studied only for the internal structures. The relative motion between the particles, which is crucial to the resonance phenomena and reactive processes, has been rarely discussed in entanglement literature because of its high dimensionality and complexity. In this project, we quantify the motional entanglement between two particles generated in ultracold collisions by computing the inter-particle purity. We reexam the formal scattering theories by using the Gaussian wave packets as pre-collision states, and then demonstrate the time evolutions of the scattered wave packets and the time-dependent inter-particle purity. We compare the degree of entanglement generated under different initial conditions, then study the influences from resonance states, and finally discuss the efficiency of different entanglement witnesses.