Generalised Equilibrium Reduced-Density Operator |
| Z. Jacyna-Onyszkiewicz
Quantum Physics Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| Equilibrium reduced-density operators for subsystems of the universe are derived from the generalised Schrödinger variational principle, additionally assuming that the values of von Neumann entropy for the subsystems are fixed and higher than zero. The obtained reduced-density operator may be useful for description of the properties of an arbitrary system (macroscopic, mesoscopic, nanoscopic, or microscopic) in the equilibrium mixed state. |
DOI:10.12693/APhysPolA.133.1231 PACS numbers: 03.65.Ca, 05.30.-d |