| Issue |
Europhys. Lett.
Volume 58, Number 4, May 2002
|
|
|---|---|---|
| Page(s) | 475 - 481 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2002-00420-8 | |
| Published online | 01 May 2002 | |
Ground-state energy fluctuations of a system coupled to a bath
1
Département de Physique Théorique, Université de Genève
CH-1211 Genève 4, Switzerland
2
Institute of Radioengineering and Electronics,
Russian Academy of Sciences Mokhovaya ul. 11, 101999 Moscow,
Russia
Received:
17
December
2001
Accepted:
4
March
2002
It is often argued that a small non-degenerate quantum system coupled to a bath has a fixed energy in its ground state since a fluctuation in energy would require an energy supply from the bath. We consider a simple model of a harmonic oscillator (the system) coupled to a linear string and determine the mean-squared energy fluctuations. We also analyze the two-time correlator of the energy and discuss its behavior for a finite string.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.65.Ta – Foundations of quantum mechanics; measurement theory / 73.23.-b – Electronic transport in mesoscopic systems
© EDP Sciences, 2002
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