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Implementation of a Reference Interferometer for Nanodetection
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Optically-biased Rydberg microwave receiver enabled by hybrid nonlinear interferometry.

Sebastian Borówka1,2, Mateusz Mazelanik1, Wojciech Wasilewski1,2

  • 1Centre for Quantum Optical Technologies, Centre of New Technologies, University of Warsaw, Warsaw, Poland.

Nature Communications
|October 16, 2025
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Summary
This summary is machine-generated.

Researchers developed a new all-optical detection method for microwave fields using Rydberg atoms. This optical-bias technique enhances sensitivity and maintains full optical operation without needing a microwave local oscillator.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Microwave Engineering

Background:

  • All-optical detection using Rydberg vapors offers minimal disturbance and high signal resilience.
  • Conventional methods often require a microwave local oscillator, compromising the all-optical nature of measurements.
  • Achieving high sensitivity in all-optical detection schemes is challenging.

Purpose of the Study:

  • To introduce a novel optical-bias detection method for Rydberg electromagnetically induced transparency (EIT) systems.
  • To maintain fully optical operation while achieving high sensitivity in microwave field detection.
  • To address and mitigate laser phase noise critical for optical-bias detection.

Main Methods:

  • Utilized a Rydberg vapor medium coupled to microwave and optical fields.
  • Implemented an optical-bias detection scheme, eliminating the need for a microwave local oscillator.
  • Performed simultaneous measurement and real-time correction of laser phase noise using a nonlinear process.

Main Results:

  • Demonstrated a 35 dB improvement in signal-to-noise ratio compared to basic methods.
  • Achieved a sensitivity of 176 nV/cm/√Hz.
  • Showcased reliable operation up to 3.5 mV/cm at 13.9 GHz and quadrature-amplitude modulated data transmission.

Conclusions:

  • The optical-bias detection method successfully maintains fully optical operation with high sensitivity.
  • Real-time laser phase noise correction is crucial for robust performance.
  • This technique enables the detection of microwave field quadratures, preserving the advantages of all-optical sensing.