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Leveraging Collective Effects for Thermometry in Waveguide Quantum Electrodynamics.

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Researchers developed a new temperature measurement technique for quantum systems. This method uses two transmons in a waveguide to distinguish between global and local bath temperatures, enabling advanced temperature sensing.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Accurate temperature measurement is crucial for controlling quantum systems.
  • Existing methods struggle to differentiate between global and local thermal environments.
  • Waveguide quantum electrodynamics (QED) experiments require precise thermal characterization.

Purpose of the Study:

  • To demonstrate a novel method for separate temperature measurements of global and local baths.
  • To introduce a new primary temperature sensor for quantum electrodynamics.
  • To leverage collective transmon states for enhanced thermal sensing capabilities.

Main Methods:

  • Utilized two transmons in the center of a waveguide.
  • Exploited the distinct coupling of bright and dark Hilbert space subspaces to noise.
  • Measured transmission properties through the waveguide to extract bath temperatures.

Main Results:

  • Successfully demonstrated a proof-of-principle experiment for the new temperature measurement technique.
  • Showed the capability to independently determine the temperatures of global and local baths.
  • Validated the use of collective transmon states for thermal sensing.

Conclusions:

  • The proposed method offers a new pathway for precise temperature sensing in quantum systems.
  • This technique can be applied to waveguide quantum electrodynamics experiments.
  • The developed system functions as a novel primary temperature sensor for distinct thermal baths.