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

Shachar Klaiman, Alexej I. Streltsov, Ofir E. Alon

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number023605
Number of pages11
JournalPhysical Review A
Issue number2
StatePublished - 1 Feb 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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