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Related Experiment Videos

Einselection in action: decoherence and pointer states in open quantum dots.

D K Ferry1, R Akis, J P Bird

  • 1Department of Electrical Engineering, Center for Solid State Electronics Research, Arizona State University, Tempe, Arizona 85287-5706, USA.

Physical Review Letters
|August 25, 2004
PubMed
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Quantum effects in open quantum dots decay via discrete pointer states. These stable quantum states mirror trapped classical orbits, explaining conductance oscillations and quantum-to-classical transitions.

Area of Science:

  • Quantum Physics
  • Mesoscopic Physics
  • Quantum Chaos

Background:

  • Decoherence theory posits that quantum effects decay through a discrete set of pointer states.
  • These pointer states are crucial for understanding the quantum-to-classical correspondence.
  • Open quantum dots exhibit conductance oscillations, a phenomenon requiring explanation within quantum mechanics.

Purpose of the Study:

  • To investigate the role of stable quantum states in the conductance oscillations of open quantum dots.
  • To determine if these quantum states exhibit properties consistent with theoretical pointer states.
  • To explore the relationship between these quantum states and classical dynamics within the open dot.

Main Methods:

  • Analysis of conductance oscillations in open quantum dot systems.

Related Experiment Videos

  • Identification and characterization of discrete, stable quantum states.
  • Comparison of quantum state properties with theoretical pointer state characteristics.
  • Investigation of correlations between quantum states and classical phase-space structures (trapped orbits).

    • Main Results:

    • Conductance oscillations in open quantum dots are governed by a discrete set of stable quantum states.
    • These identified quantum states possess properties analogous to theoretical pointer states.
    • A strong relationship exists between these stable quantum states and trapped classical orbits in the open dot.

    Conclusions:

    • Stable quantum states in open quantum dots act as pointer states, governing decoherence.
    • The observed quantum states provide a mechanism for the quantum-to-classical correspondence in these systems.
    • The findings link quantum phenomena in open dots to classical dynamics, specifically trapped orbits.