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Related Experiment Videos

Decoherence control by tracking a Hamiltonian reference molecule.

Gil Katz1, Mark A Ratner, Ronnie Kosloff

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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This study introduces a control scheme to minimize molecular system dissipation and retain coherence. A driving field is calculated to overcome decoherence, with a feedback control implementation suggested.

Area of Science:

  • Quantum mechanics
  • Molecular dynamics
  • Control theory

Background:

  • Molecular systems interacting with an environment (bath) experience decoherence, losing quantum coherence.
  • Minimizing dissipation while preserving coherent evolution is crucial for quantum technologies.

Purpose of the Study:

  • To develop a control scheme for minimizing dissipation in molecular systems.
  • To maximize the retention of coherent evolution during interaction with a bath.
  • To identify a driving field that overcomes decoherence effects.

Main Methods:

  • Relating the evolution of an open molecular system to an identical freely propagating system.
  • Calculating a driving field that maximizes the projection of the open system onto the free system.

Related Experiment Videos

  • Simulating the time evolution of a two-electronic-state molecular system coupled to a bath.

    • Main Results:

    • A specific driving control field was calculated that effectively overcomes decoherence.
    • The scheme successfully minimizes dissipation while preserving coherent evolution.

    Conclusions:

    • A viable control strategy exists to combat decoherence in molecular systems.
    • The proposed scheme can be implemented in laboratory settings using feedback control.