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Decoherence from Vacuum Fluctuations

ContributorsButtiker, Markus
Published in36th Rencontres de Moriond : Electronic Correlations: from meso- to nano-physics, Editors Montambaux, G. and Martin, T., p. 231-236
Presented at Les Arcs (Savoie, France), 20-27 Jan 2001
PublisherEDP Sciences
Publication date2001
Abstract

Vacuum fluctuations are a source of irreversibility and decoherence. We investigate the persistent current and its fluctuations in a ring with an in-line quantum dot with an Aharonov-Bohm flux through the hole of the ring. The Coulomb blockade leads to persistent current peaks at values of the gate voltage at which two charge states of the dot have the same free energy. We couple the structure to an external circuit and investigate the effect of the zero-temperature (vacuum fluctuations) on the ground state of the ring. We find that the ground state of the ring undergoes a crossover from a state with an average persistent current much larger than the (time-dependent) mean squared fluctuations to a state with a small average persistent current and large mean squared fluctuations. We discuss the spectral density of charge fluctuations and discuss diffusion rates for angle variables characterizing the ground state in Bloch representation.

Keywords
  • Mesoscopic systems and quantum hall effect
  • Condensed matter
Citation (ISO format)
BUTTIKER, Markus. Decoherence from Vacuum Fluctuations. In: 36th Rencontres de Moriond : Electronic Correlations: from meso- to nano-physics. Les Arcs (Savoie, France). [s.l.] : EDP Sciences, 2001. p. 231–236.
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ISBN978-2-86883-570-3
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