Measurement-enhanced determination of BEC phase transitions

Bason, Mark, Heck, Robert, Napolitano, Mario, Elíasson, Ottó, Müller, Romain, Thorsen, Aske, Zhang, Wen-Zhuo, Arlt, Jan J and Sherson, Jacob F (2018) Measurement-enhanced determination of BEC phase transitions. Journal of Physics B: Atomic, Molecular and Optical Physics, 51 (17). 175301 1 -9. ISSN 0953-4075

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We demonstrate how dispersive atom number measurements during evaporative cooling can be used for enhanced determination of the parameter dependence of the transition to a Bose–Einstein condensate (BEC). In this way shot-to-shot fluctuations in initial conditions are detected
and the information extracted per experimental realization is increased. We furthermore calibrate in situ images from dispersive probing of a BEC with corresponding absorption images in timeof- flight. This allows for the determination of the transition point in a single experimental realization by applying multiple dispersive measurements. Finally, we explore the continuous probing of several consecutive phase transition crossings using the periodic addition of a focused ‘dimple’ potential.

Item Type: Article
Keywords: Bose–Einstein condensates, Faraday effect, phase transitions, quantum simulation, ultracold quantum gases, phase diagrams, dispersive probing
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Jodie Bacon
Date Deposited: 13 Aug 2018 08:35
Last Modified: 16 Jul 2019 12:15

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Project NameSussex Project NumberFunderFunder Ref
UnsetUnsetThe Danish Council for Independent ResearchUnset
UnsetUnsetThe Lundbeck FoundationUnset
UnsetUnsetThe Villum FoundationUnset
UnsetUnsetThe European Research CouncilUnset
UnsetUnsetMarie Curie IEFUnset