Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Gases (Bosons) III
Q 28.3: Talk
Wednesday, March 13, 2019, 11:15–11:30, S HS 037 Informatik
Multipartite Entanglement From Quench Dymamics in Spinor Bose Gases using Bogoliubov Theory — •Beatrice Latz1,2, Ricardo Costa de Almeida1,2, and Philipp Hauke1,2 — 1Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg, Germany — 2Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg, Germany
Multipartite entanglement is a resource for quantum-enhanced metrology. We study this enhancement in the context of quench dynamics and phase transitions in quantum many-body systems using Quantum Fisher Information (QFI). The QFI is a witness for genuine multipartite entanglement that can be quantified by experimental observables. Here, we consider Spinor Bose-Einstein condensates (BEC) which provide a well-controlled systems to study quantum phenomena. In line with experiments, a quench is followed by spin changing collisions which are associated with the creation of entanglement. In particular, we are interested in these spin mixing dynamics at long times after weakly quenching a thermal Spinor-1 BEC. We examine these dynamics at the theoretical level and compute observables relevant to the QFI in the framework of Bogoliubov theory. There, we show that the QFI in different phases of the Spinor-1 BEC at finite temperatures can be extracted from the occupation of Bogoliubov modes after a controlled quench. Our approach allows us to identify highly entangled states and is used to develop new measurement protocols for studying quantum-enhancement in such systems.