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Energy Exchange in Driven Open Quantum Systems at Strong Coupling.

Matteo Carrega1, Paolo Solinas1, Maura Sassetti1,2

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We studied energy transfer in driven quantum systems. Strong coupling to heat baths can make interactions the main dissipation channel, revealing quantum stochastic resonances.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Condensed matter physics

Background:

  • Understanding energy transfer in quantum systems is crucial for developing quantum technologies.
  • Strong coupling to a heat bath introduces complex dynamics and dissipation.
  • Previous models often simplified the interaction or coupling strength.

Purpose of the Study:

  • To investigate time-dependent energy transfer in a driven quantum system strongly coupled to a heat bath.
  • To derive exact formal expressions for energy dissipation statistics.
  • To analyze the role of strong coupling in energy dissipation channels.

Main Methods:

  • Influence functional approach to model quantum dynamics.
  • Derivation of formal expressions for energy dissipation statistics.
  • Application to a driven dissipative two-state system with Ohmic dissipation (K=1/2).

Main Results:

  • Energy flows in the system obey a balance relation.
  • Strong coupling can lead to the system-bath interaction being the dominant dissipation channel.
  • Analytic results for Ohmic dissipation (K=1/2) reveal driving-induced coherences and quantum stochastic resonances.
  • These characteristics persist for coupling values near K=1/2.

Conclusions:

  • The influence functional approach provides exact expressions for energy dissipation statistics.
  • Strong coupling significantly alters energy transfer pathways in driven quantum systems.
  • Quantum stochastic resonances and driving-induced coherences are key phenomena in strongly coupled systems.