“Bose-Einstein condensates, phase-coherent dynamics and entangled states: to what extent and for what purpose?” (Prof. Alice Sinatra)
- Datum: 22.10.2024
- Uhrzeit: 14:30
- Vortragende(r): Prof. Alice Sinatra
- Laboratoire Kastler Brossel, Paris, France
- Ort: Max Planck Institute of Quantum Optics, Hans-Kopferman-Straße 1, 85748 Garching
- Raum: Herbert Walther Lecture Hall
The macroscopic population of a mode in a Bose-Einstein condensate, of bosons or paired fermions, generates spatial and temporal coherence properties at the macroscopic scale. The interactions and the intrinsic multimode nature of the atomic field enrich the phase dynamics of condensates, raising questions of fundamental and applied order.
On the one hand, they provide a fundamental limit on the coherence time, which we will discuss starting from the quantum generalisation of the second Josephson equation for the phase of a superfluid and the dynamics of its low-energy excitations.
On the other hand, they provide a mechanism for entanglement between atoms. The states produced, which are relatively resistant to decoherence, are useful for atomic sensors and metrology. We will give an example for the joint estimation of multiple parameters or the measurement of a spatially extended field.