Abstract
For macroscopic quantum systems, we study what is measured when equilibrium fluctuations of macrovariables are measured in an ideal way that mimics classical ideal measurements as closely as possible. We find that the symmetrized time correlation is always obtained for such measurements. As an important consequence, we show that the fluctuation-dissipation theorem is partially violated as a relation between observed quantities in macroscopic quantum systems even if measurements are made in such an ideal way.
- Received 8 September 2015
DOI:https://doi.org/10.1103/PhysRevLett.117.010402
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Condensed Matter, Materials & Applied PhysicsStatistical Physics & Thermodynamics