Journal
JOURNAL OF STATISTICAL PHYSICS
Volume 133, Issue 6, Pages 1161-1174Publisher
SPRINGER
DOI: 10.1007/s10955-008-9640-x
Keywords
Quantum Brownian motion; Information; Entropy; Landauer principle
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We compare the thermodynamic entropy of a quantum Brownian oscillator derived from the partition function of the subsystem with the von Neumann entropy of its reduced density matrix. At low temperatures we find deviations between these two entropies which are due to the fact that the Brownian particle and its environment are entangled. We give an explanation for these findings and point out that these deviations become important in cases where statements about the information capacity of the subsystem are associated with thermodynamic properties, as it is the case for the Landauer principle.
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