In this article a novel characterization of Bose-Einstein condensates is proposed. Instead relying on occupation numbers few dominant modes, which become macroscopic in the limit infinite particle numbers, it focuses regular excitations whose stay bounded limit. manner, subspaces global, respectively local wave functions are identified. Their orthogonal complements determine particles forming p...

The distinction between proper and improper mixtures is a staple of the discussion of foundational questions in quantum mechanics. Here we note an analogous distinction in the context of the theory of entanglement. The terminology of ‘proper’ versus ‘improper’ separability is proposed to mark the distinction. 1 Proper and Improper mixtures In many discussions of the measurement problem in quant...

Statistical thermodynamic phenomenon of fluctuations (noise) appearance in the controlled substance is under consideration in the proposed work. Their types as well as the relationship among them revealing in the totality of influences on the characteristics of a noise thermometer as a certified metrological mean of measuring the parameters of electric noise have been researched. The background...