Upcoming seminar Joint ICTP/SISSA Statistical Physics Seminar

[Statistical Physics]

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR



Tuesday, 18 March -   11:30 a.m.

Luigi Stasi Seminar Room
ICTP Leonardo Building (1st floor)



U. Marzolino (University of Ljubljana)


"Precision measurements of temperature and chemical potential of quantum 
gases"



Abstract:

We investigate the sensitivity with which the temperature and the 
chemical potential characterizing quantum gases can be measured. We 
calculate the corresponding quantum Fisher information matrices for both 
fermionic and bosonic gases. For the latter, particular attention is 
devoted to the situation close to the Bose-Einstein condensation 
transition, which we examine not only for the standard scenario in three 
dimensions, but also for generalized condensation in lower dimensions, 
where the bosons condense in a subspace of Hilbert space instead of a 
unique ground state, as well as condensation at fixed volume or fixed 
pressure. We show that Bose Einstein condensation can lead to sub-shot 
noise sensitivity for the measurement of the chemical potential. We also 
examine the influence of interactions on the sensitivity in three 
different models, and show that mean-field and contact interactions 
deteriorate the sensitivity but only slightly for experimentally 
accessible weak interactions.