Estimation of quantum-state via linear Faraday effect

PRELEGENT: 
mgr Marek Kopciuch
DataSeminarium: 
2021-06-07
AfiliacjaPrelegenta: 
Zakład Fotoniki, Instytut Fizyki UJ
AbstraktSeminarium: 

One of the most important challenges of quantum information science is to reconstruct an unknown quantum state, such process is known as a quantum state tomography (QST). As the atomic vapours are a promising candidate for the processing and storage of quantum information, it is crucial to estimate their quantum state. Until now, most approaches to “atomic” quantum-state tomography have explored ultra-cold ensembles, which greatest advantage is the reduction of various relaxation processes. Nonetheless, room-temperature alkali-metal vapours enclosed in paraffin-coated cells also provide various benefits, e.g. the simplicity of experimental setup and averaging of interactions over the whole ensemble.

During presentation I will present an algorithm, enabling determination of a collective quantum-state of a room-temperature atomic vapour via weak non-demolition measurement performed by off-resonant, linearly-polarized laser light. The estimation is based on a set of a measurements of Faraday rotation of light transmitted through an atomic medium and is done by linear inversion of measured signals.

To participate in the webinar, please, contact dr Szymon Pustelny (szymon.pustelny@uj.edu.pl) MS Teams Channel: Zakład Fotoniki IF UJ. Link to the channel:  https://teams.microsoft.com/l/channel/19%3a3721f0b9286c47c78efdd4f33e6adf7a%40thread.tacv2/Og%25C3%25B3lny?groupId=d4c030cf-1dbb-4300-ad6d-f346f7a2dd08&tenantId=eb0e26eb-bfbe-47d2-9e90-ebd2426dbceb