Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantum Gases: Bosons II
Q 22.3: Vortrag
Dienstag, 1. März 2016, 15:00–15:15, e001
Ramsey Interferometry with squeezed collective spin states under decoherence — •Björn Schrinski1, Stefan Nimmrichter2, and Klaus Hornberger1 — 1Fakultät für Physik, Universität Duisburg-Essen — 2Centre For Quantum Technologies, National University of Singapore
We discuss the non-unitary time evolution of number-squeezed collective spin states in Ramsey interferometry. We focus on decoherence models as proposed by the CSL model [1] or utilized by macroscopicity measures [2]. Exemplary experimental realisations are BEC superpositions with ultracold Rubidium atoms in double [3] and single-well [4] potentials. Our analytical results are based on a continuous-variables approach in the basis of Dicke states and are verified using exact numerical simulations in cases when the particle number is conserved.
[1] Bassi et al., Rev. Mod. Phys. 85, 471-527 (2013)
[2] Nimmrichter et al., Phys. Rev. Lett. 110, 160403 (2013)
[3] Berrada et al., Nat. Commun. 4, 2077 (2013)
[4] S. van Frank et al., Nat. Commun. 5, 4009 (2014)