Thermometry precision in strongly correlated ultracold lattice gases
Mehboudi, Mohammad (Universitat Autònoma de Barcelona. Departament de Física)
Moreno Cardoner, María (Queen's University. Centre for Theoretical Atomic, Molecular and Optical Physics)
De Chiara, Gabriele (Queen's University. Centre for Theoretical Atomic, Molecular and Optical Physics)
Sanpera Trigueros, Anna (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2015
Abstract:	The precise knowledge of the temperature of an ultracold lattice gas simulating a strongly correlated system is a question of both fundamental and technological importance. Here, we address such question by combining tools from quantum metrology together with the study of the quantum correlations embedded in the system at finite temperatures. Within this frame we examine the spin- XY chain, first estimating, by means of the quantum Fisher information, the lowest attainable bound on the temperature precision. We then address the estimation of the temperature of the sample from the analysis of correlations using a quantum non demolishing Faraday spectroscopy method. Remarkably, our results show that the collective quantum correlations can become optimal observables to accurately estimate the temperature of our model in a given range of temperatures.
Grants:	European Commission 618074 Ministerio de Economía y Competitividad FIS2008-01236 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-9
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	New journal of physics, Vol. 17 (May 2015) , art. 55020, ISSN 1367-2630

DOI: 10.1088/1367-2630/17/5/055020

11 p, 1.5 MB

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