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Filter circuit for suppression of electric-field noise in Rydberg-atom experiments.

Xinyan Xiang1, Shuaijie Li1, Alisher Duspayev1

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.

The Review of Scientific Instruments
|September 4, 2025
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Summary

A new clamp switch circuit minimizes electric field noise for Rydberg atoms, improving quantum science experiments. This device enables precise control and fast ionization pulses for enhanced atom detection and spectroscopy.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Precision Spectroscopy

Background:

  • Rydberg atoms are crucial for quantum information science and precision spectroscopy.
  • Minimizing dc Stark effect-induced decoherence requires electric field noise below ~10 mV/cm.

Purpose of the Study:

  • To introduce a novel electronic circuit, the clamp switch, for precise low-noise electric field control of Rydberg atoms.
  • To enable simultaneous low-noise operation and high-voltage ionization pulse application for atom detection.

Main Methods:

  • Design and implementation of a clamp switch circuit.
  • Analysis of the circuit's noise suppression performance for various signal levels.
  • Application of the clamp switch in Rydberg spectroscopy and Stark spectroscopy for calibration.

Main Results:

  • The clamp switch effectively reduces electric field noise, enabling conditions suitable for Rydberg atom coherence.
  • Demonstrated reduction in spectral width and increase in signal strength of Rydberg lines by a factor of two.
  • Successful estimation of electric field noise and calibration using Rydberg Stark spectroscopy.

Conclusions:

  • The clamp switch is a simple yet effective solution for low-noise electric field control in Rydberg atom experiments.
  • Improved coherence times and spectroscopic resolution are achieved, benefiting fundamental and applied quantum research.
  • The circuit facilitates advanced techniques like electric-field ionization detection and calibration.