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Quantum optical two-atom thermal diode.

Cahit Kargı1, M Tahir Naseem1, Tomáš Opatrný2

  • 1Department of Physics, Koç University, 34450 Sariyer, Istanbul, Turkey.

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We developed a quantum thermal diode model using interacting qubits. Anisotropic coupling enables nonreciprocal heat flow and rectification, even with identical qubits and equal dissipation.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Quantum optics

Background:

  • Heat transfer and thermal diodes are crucial in thermodynamics.
  • Quantum systems offer novel ways to control heat flow.
  • Rectification of heat flow is a key challenge in thermal management.

Purpose of the Study:

  • To propose a quantum-optical model for a thermal diode.
  • To investigate heat transfer rectification using interacting qubits.
  • To identify mechanisms for nonreciprocal heat flow.

Main Methods:

  • Developed a quantum-optical model for heat transfer between two thermal baths.
  • Utilized a pair of interacting qubits coupled by a Raman field.
  • Employed a global master equation to govern heat flow dynamics.
  • Analyzed effects of anisotropic qubit interaction and bath spatial overlap.

Main Results:

  • Demonstrated nonreciprocal heat flow and rectification via anisotropic qubit interaction.
  • Achieved rectification even with identical qubits and equal dissipation rates.
  • Explained rectification through four-wave mixing and Raman transitions.
  • Showcased high-efficiency rectification of large heat currents at resonance.

Conclusions:

  • Anisotropic two-qubit interaction is key for quantum thermal diode operation.
  • The proposed model offers efficient heat flow rectification.
  • Potential applications exist in optomechanical systems, trapped ions, and circuit QED.