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Steady-State Coherences by Composite System-Bath Interactions.

Giacomo Guarnieri1,2, Michal Kolář1, Radim Filip1

  • 1Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.

Physical Review Letters
|September 1, 2018
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Summary
This summary is machine-generated.

We found conditions for generating steady-state coherences (SSC) in quantum systems interacting with a thermal bath. These SSC are independent of the initial system state and grow stronger as the bath cools.

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Area of Science:

  • Quantum mechanics
  • Quantum thermodynamics
  • Condensed matter physics

Background:

  • Steady-state coherences (SSC) are crucial for quantum technologies.
  • Generating SSC typically requires external drives or measurements.
  • Understanding spontaneous SSC generation is key for quantum control.

Purpose of the Study:

  • To identify conditions for generating steady-state coherences (SSC) without external drives or measurements.
  • To analyze the properties and dependence of these SSC on system and bath parameters.
  • To explore the role of thermal baths in quantum coherence generation.

Main Methods:

  • Analytical treatment in the weak coupling regime for paradigmatic models.
  • Numerical simulations for complex systems beyond weak coupling.
  • Investigation of the interaction Hamiltonian's structure.

Main Results:

  • Sufficient conditions for spontaneous SSC generation were identified.
  • SSC are independent of the initial system state, allowing for initially incoherent states.
  • SSC significance increases with decreasing bath temperature.
  • Phenomenon confirmed in both analytical and numerical studies.

Conclusions:

  • Quantum systems can spontaneously generate steady-state coherences through interaction with thermal baths.
  • The temperature of the thermal bath is a critical factor in enhancing SSC.
  • These findings offer new pathways for creating and controlling quantum coherence in various experimental platforms.