Uncertainty product of an out-of-equilibrium many-particle system

• Verfasst von: Klaiman, Shachar [VerfasserIn]
• Verfasst von: Streltsov, Alexej Iwanowitsch [VerfasserIn]
• Verfasst von: Alon, Ofir E. [VerfasserIn]
• Titel: Uncertainty product of an out-of-equilibrium many-particle system
• Verf.angabe: Shachar Klaiman, Alexej I. Streltsov, and Ofir E. Alon (1Theoretische Chemie, Physikalisch-Chemisches Institut, Universit¨at Heidelberg)
• E-Jahr: 2016
• Jahr: 1 February 2016
• Umfang: 11 S.
• Fussnoten: Gesehen am 13.05.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2016
• Band/Heft Quelle: 93(2016,2) Artikel-Nummer 023605, 11 Seiten
• ISSN Quelle: 2469-9934
• DOI: doi:10.1103/PhysRevA.93.023605
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698114443

Abstract

The variance of a many-particle operator is a very sensitive probe of many-body correlations. In contrast to the expectation value of such operators which depends on the condensation fraction of the Bose-Einstein condensate (BEC), their variance depends on the absolute number of depleted particles. Consequentially, the many-body correlations incorporated within the variance can be observed even in the limit of an infinite number of particles (keeping the interaction parameter, i.e., the product of the number of particles times the scattering length, constant) when the system becomes 100% condensed. In the present work we show both analytically and numerically the effect of many-body correlations on the variance and uncertainty product for an out-of-equilibrium BEC. Our work demonstrates the need to go beyond a mean-field description of the condensate in order to correctly describe these quantities even when only a single particle is depleted and the system is by definition 100% condensed.