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Scientific article
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Ground State Energy Fluctuations of a System Coupled to a Bath

Published inEurophysics letters, vol. 58, no. 4, p. 475-481
Publication date2002
Abstract

It is often argued that a small non-degenerate quantum system 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.

Keywords
  • Mesoscopic systems and quantum hall effect
  • Statistical Mechanics
  • Condensed matter
  • Energy fluctuations
  • Ground states
  • Quantum system
  • Harmonic oscillators
  • Quantum theory
Citation (ISO format)
NAGAEV, Kirill, BUTTIKER, Markus. Ground State Energy Fluctuations of a System Coupled to a Bath. In: Europhysics letters, 2002, vol. 58, n° 4, p. 475–481. doi: 10.1209/epl/i2002-00420-8
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ISSN of the journal0295-5075
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