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Related Experiment Videos

Quantum dynamics driven by continuous laser fields under measurements: towards measurement-assisted quantum dynamics

M Sugawara1

  • 1Department of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. michi@chem.keio.ac.jp

The Journal of Chemical Physics
|December 15, 2005
PubMed
Summary

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Quantum measurements can freeze system dynamics or isolate unmeasured states. This study introduces a superoperator to analyze measurement effects, revealing potential for measurement-assisted quantum control.

Area of Science:

  • Quantum mechanics
  • Quantum optics
  • Quantum information science

Background:

  • Understanding quantum system dynamics under continuous measurement is crucial.
  • Laser-driven systems exhibit complex behaviors influenced by external fields.
  • The impact of measurement on quantum coherence and population dynamics requires detailed investigation.

Purpose of the Study:

  • To develop a theoretical framework for analyzing quantum system dynamics under continuous measurement.
  • To investigate how quantum measurements affect coherent population dynamics driven by laser fields.
  • To explore the potential of measurement-assisted quantum control.

Main Methods:

  • Definition of a superoperator to account for system transitions due to measurement.

Related Experiment Videos

  • Derivation of an effective Liouvillian governing incoherent population dynamics under frequent measurements.
  • Application of the formulation to two-level and Lambda-type three-level systems.

    • Main Results:

    • Quantum system dynamics become frozen in the frequent measurement limit.
    • The space spanned by unmeasured states becomes isolated from the original system.
    • Quantum measurements were shown to hinder coherent population dynamics in specific systems.

    Conclusions:

    • The developed superoperator effectively describes measurement-induced transitions.
    • Frequent quantum measurements can lead to frozen dynamics and isolated subspaces.
    • Analysis suggests that quantum control can be achieved by assisting quantum measurements.