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Reversing Heat Flow by Coherence in a Multipartite Quantum System.

Keyi Huang1, Qi Zhang2, Xiangjing Liu3

  • 1Southern University of Science and Technology, Department of Physics, State Key Laboratory of Quantum Functional Materials, and Guangdong Basic Research Center of Excellence for Quantum Science, Shenzhen 518055, China.

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Quantum coherence in multipartite spin systems can reverse heat flow, challenging classical thermodynamics. Local quantum properties allow precise control over energy transfer direction and magnitude.

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Area of Science:

  • Quantum Thermodynamics
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • The second law of thermodynamics traditionally dictates spontaneous heat flow from hot to cold.
  • Recent studies show quantum correlations can reverse this flow, challenging classical expectations.
  • Internal quantum states, not just environmental correlations, are explored for heat flow control.

Purpose of the Study:

  • To experimentally demonstrate heat flow reversal using internal quantum coherence.
  • To investigate the role of coherence in multipartite spin systems for energy transfer.
  • To establish control over heat flow direction and magnitude via local quantum properties.

Main Methods:

  • Utilizing a multipartite spin system with internal quantum coherence.
  • Employing the collision model with cascade interaction for simulation.
  • Analyzing the impact of coherence strength and phase on energy transfer.

Main Results:

  • Internal quantum coherence was shown to reverse heat flow without environmental correlations.
  • The strength and phase of coherence were found to dictate energy transfer direction and magnitude.
  • Precise control over heat flow was achieved using only local quantum properties.

Conclusions:

  • Internal quantum coherence is a viable mechanism for reversing heat flow.
  • Quantum properties offer novel methods for manipulating thermodynamic processes.
  • This research opens avenues for controlling energy transfer at the quantum level.