Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 29: Quantum Gases: Bosons IV

Q 29.5: Vortrag

Dienstag, 7. März 2017, 15:30–15:45, P 204

A Bosonic Josephson Junction with an Impurity — •Maximilian Dirkmann, Gabriel Dufour, and Andreas Buchleitner — Institute of Physics, University of Freiburg, Germany

We study the dynamics of a Bose-Einstein condensate in a double-well potential, or bosonic Josephson junction [1], in the presence of a mobile impurity particle. This allows us to test the practicability of a quantum probe scheme, where measurements are performed on the impurity in order to obtain information about the rest of the system.

The system is described using a two-site Bose-Hubbard Hamiltonian which accounts for tunneling between the wells and on-site interactions between the particles. We observe a variety of dynamical regimes as the relative strength of tunneling and interactions is changed. In particular, we study the entanglement of the impurity particle with the rest of the system. In the weakly interacting regime, we demonstrate that the amplitude of impurity’s oscillations between the two wells is related to the purity of its reduced density matrix.

[1] G.J. Milburn et al. Phys. Rev. A 55, 4318-4324 (1997).