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What can we learn from noise? - Mesoscopic nonequilibrium statistical physics.

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Mesoscopic systems provide a platform for quantum transport research. Noise measurements in these systems offer insights into statistical physics and experimentally test the fluctuation theorem in the quantum regime.

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Area of Science:

  • Quantum physics
  • Statistical mechanics
  • Mesoscopic systems

Background:

  • Mesoscopic systems, small electric circuits operating in the quantum regime, are valuable for studying quantum transport.
  • Fluctuation, or noise, measurements are crucial for understanding fundamental physical system properties.

Purpose of the Study:

  • To demonstrate the contribution of mesoscopic systems to statistical physics.
  • To highlight the significance of fluctuation theorem (FT) in statistical physics.
  • To explore information obtainable from current noise measurements in mesoscopic systems.

Main Methods:

  • Reviewing theoretical concepts of quantum transport and fluctuation theorem.
  • Describing experimental techniques for measuring current and current noise.
  • Utilizing electron interferometers as a key experimental setup.

Main Results:

  • Established the significance of noise measurements in probing fundamental physics.
  • Presented the first experimental test of the fluctuation theorem in the quantum regime using an electron interferometer.
  • Demonstrated the utility of mesoscopic systems in advancing statistical physics.

Conclusions:

  • Mesoscopic systems are powerful tools for exploring quantum statistical physics.
  • Noise measurements provide deep insights into quantum transport phenomena.
  • Experimental validation of the fluctuation theorem opens new avenues in quantum research.