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What is measured when fluctuation of macrovariables is measured in quantum systems | | Kyota Fujikura
; Akira Shimizu
; | | Date: |
2 Aug 2015 | | Abstract: | For equilibrium states of macroscopic quantum systems, we study what are
measured when fluctuations of macrovariables are measured. To mimic classical
ideal measurements, we consider ’quasi-classical measurements’ which are
minimally-disturbing, homogeneous, and unbiased quantum measurements with
moderate magnitudes of errors. For all such measurements, we find that the
symmetrized time correlation is obtained among many quantum correlations that
reduce, in the classical limit, to the same classical time correlation. As an
important consequence of this universal result, we show that the
fluctuation-dissipation theorem (FDT) and Onsager’s hypothesis are partially
violated in macroscopic quantum systems. The post-measurement state is squeezed
by backactions of the measurements, but is macroscopically identical to the
pre-measurement equilibrium state. This state evolves with time, in which
macrovariables fluctuate and relax, unlike other microstates (such as the Gibbs
state) that represent the same equilibrium state. | | Source: | arXiv, 1508.0221 | | Services: | Forum | Review | PDF | Favorites | |
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