# Berlin 2014 – wissenschaftliches Programm

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

# Q: Fachverband Quantenoptik und Photonik

## Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

### Q 30.74: Poster

### Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

**Generating Mesoscopic Bell States via Collisions of Distinguishable Quantum Bright Solitons** — Bettina Gertjerenken^{1}, Thomas Billam^{2}, Caroline Blackley^{3}, Ruth Le Sueur^{3}, Lev Khaykovich^{4}, Simon Cornish^{5}, and •Christoph Weiss^{5} — ^{1}Carl von Ossietzky Universität, Oldenburg, Germany — ^{2}Department of Physics, University of Otago, Dunedin, New Zealand — ^{3}Department of Chemistry, JQC Durham-Newcastle, Durham University, Durham, United Kingdom — ^{4}Department of Physics, Bar-Ilan University, Ramat-Gan, Israel — ^{5}Department of Physics, JQC Durham-Newcastle, Durham University, Durham, United Kingdom

We investigate numerically the collisions of two distinguishable quantum matter-wave bright solitons in a one-dimensional harmonic trap. We show that such collisions can be used to generate mesoscopic Bell states that can reliably be distinguished from statistical mixtures. Calculation of the relevant s-wave scattering lengths predicts that such states could potentially be realized in quantum-degenerate mixtures of 85Rb and 133Cs. In addition to fully quantum simulations for two distinguishable two-particle solitons, we use a mean-field description supplemented by a stochastic treatment of quantum fluctuations in the soliton’s center of mass: we demonstrate the validity of this approach by comparison to a mathematically rigorous effective potential treatment of the quantum many-particle problem.

[1] B. Gertjerenken *et al.*, Phys. Rev. Lett. **111** 100406 (2013)