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Quantum-based vacuum metrology at NIST.

Julia Scherschligt1, James A Fedchak1, Zeeshan Ahmed1

  • 1National Institute of Standards and Technology, 100 Bureau Dr. Gaithersburg, MD 20899.

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NIST is advancing pressure measurement science by exploring optical techniques and quantum properties to redefine the pascal (Pa). This work aims to align vacuum metrology with modern quantum-based standards.

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Area of Science:

  • Metrology
  • Quantum Physics
  • Optical Science

Background:

  • The National Institute of Standards and Technology (NIST) focuses on the measurement science for pressure, specifically the pascal (Pa).
  • Traditional methods for pressure dissemination are being re-evaluated in light of modern scientific advancements.

Purpose of the Study:

  • To investigate modern optical-based techniques for pascal metrology.
  • To explore recasting the pascal in terms of quantum properties and fundamental constants.
  • To ensure vacuum metrology aligns with the global shift towards quantum-based metrology.

Main Methods:

  • Investigation of multi-photon ionization techniques.
  • Application of cavity ringdown spectroscopy for pressure measurements.
  • Interrogation of gas refractive index using optical cavities for low vacuum.
  • Counting background particles in high vacuum using trapped laser-cooled atoms.

Main Results:

  • Exploration of advanced optical methods for precise pressure measurement.
  • Development of strategies to link pressure standards to fundamental constants.
  • Progress in quantum-based approaches for vacuum metrology.

Conclusions:

  • Modern optical techniques show promise for advancing pascal metrology.
  • Recasting the pascal using quantum properties will enhance measurement consistency.
  • NIST's research contributes to the global trend of quantum-based metrology.