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Published on: December 4, 2017

Finite-bath open quantum systems: Exact dynamics.

Devvrat Tiwari1, Subhashish Banerjee1

  • 1Indian Institute of Technology, Jodhpur 342030, India.

The Journal of Chemical Physics
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

This study presents a method for deriving exact master equations for open quantum systems. It reveals novel quantum channels and demonstrates quantum batteries with enhanced charge storage capabilities.

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Area of Science:

  • Quantum physics
  • Open quantum systems
  • Quantum information theory

Background:

  • Open quantum systems are crucial for understanding quantum phenomena.
  • Deriving exact master equations for complex systems remains a challenge.
  • The principle of minimal dissipation offers a novel approach.

Purpose of the Study:

  • To develop a method for deriving exact master equations from dynamical maps for finite open quantum systems.
  • To investigate the dynamics of the central spin model under different interaction types.
  • To explore the thermodynamic performance of derived quantum systems as quantum batteries.

Main Methods:

  • Utilizing the principle of minimal dissipation to derive exact master equations.
  • Analyzing the central spin model with Heisenberg and stochastic pure-dephasing interactions.
  • Deriving closed-form master equations for both interaction models.

Main Results:

  • A novel phase-covariant quantum channel is identified for Heisenberg interactions in the strong-coupling regime.
  • The stochastic pure-dephasing interaction leads to a microscopic derivation of the random telegraph noise (RTN) channel.
  • Closed-form master equations for both models were successfully derived.
  • Quantum batteries based on RTN demonstrate advantages in charge storage and reveal a direct relationship between quantum heat current and charging power.

Conclusions:

  • The developed method provides exact master equations for open quantum systems.
  • The study establishes a quantum foundation for the RTN channel and offers insights into stochastic couplings.
  • The findings open new avenues for quantum information protocols and quantum battery research.