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Ground State Energy Fluctuations of a System Coupled to a Bath

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Published in Europhysics letters. 2002, vol. 58, no. 4, p. 475-481
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 effectStatistical MechanicsCondensed matterEnergy fluctuationsGround statesQuantum systemHarmonic oscillatorsQuantum theory
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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 https://archive-ouverte.unige.ch/unige:4254

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Deposited on : 2009-11-30

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