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Related Experiment Videos

Factorization of the dephasing process in a quantum open system.

Y B Gao1, C P Sun

  • 1College of Applied Science, Beijing University of Technology, Beijing, 100022, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
Summary
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This study reveals a new fluctuation-dissipation relation for quantum open systems where energy is conserved. It links bath fluctuations to dephasing, identifying vacuum fluctuations and thermal excitations as key sources.

Area of Science:

  • Quantum physics
  • Open quantum systems
  • Quantum information

Background:

  • The fluctuation-dissipation relation is established for quantum open systems with energy dissipation.
  • Information leakage in quantum systems, even with conserved energy, requires further understanding.

Purpose of the Study:

  • To uncover a fluctuation-dissipation relation for quantum open systems where energy is conserved.
  • To identify the sources of dephasing in such systems.

Main Methods:

  • Revisiting a universal dephasing model for quantum open systems.
  • Utilizing a quantum nondemolition interaction between the system and bath.
  • Analyzing the decoherence factor of the dephasing process.

Main Results:

Related Experiment Videos

  • A novel relation is found between bath fluctuation and dephasing in energy-conserving quantum open systems.
  • The decoherence factor is shown to be factorized, indicating distinct dephasing sources.
  • Vacuum quantum fluctuations and thermal excitations are identified as the two primary sources of dephasing.

Conclusions:

  • The study establishes a new fluctuation-dissipation relation for information leakage in quantum open systems.
  • Understanding dephasing sources is crucial for controlling quantum information in finite-temperature environments.