Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 30.73: Poster

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

Composite bosons: Entangled parts, bosonic whole — •Malte Tichy1, Peter Alexander Bouvrie2, and Klaus Mølmer11Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark — 2Departamento de Física Atómica, Molecular y Nuclear and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, E-18071 Granada, Spain

Most bosons in nature are composites made of more elementary bosons and fermions. Still, from hadrons to ultracold molecules, these composites behave very similarly to elementary bosons, because the statistics of the underlying constituents is negligible. The deviation from ideal bosonic behavior is quantified by the normalization ratio of the quantum state of N composites. Using tools from quantum information science, the normalization ratio for two-boson and two-fermion composites can be bounded efficiently in terms of entanglement measures [1,2]. Using these results, we predict an abrupt transition between ordinary and exaggerated bosonic behavior in a condensate of two-boson composites [1], and show how the entanglement between the parts becomes observable in the collective interference pattern of the bosonic whole [3].

[1] M.C. Tichy, P.A. Bouvrie, K. Mølmer, Phys. Rev. A (Rapid) (in press), arXiv:1308.2896 (2013)

[2] M.C. Tichy, P.A. Bouvrie, K. Mølmer, Phys. Rev. A 86, 042317 (2012)

[3] M.C. Tichy, P.A. Bouvrie, K. Mølmer, Phys. Rev. Lett. 109, 260403 (2012)

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