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Related Experiment Video

Updated: Feb 2, 2026

Use of Sacrificial Nanoparticles to Remove the Effects of Shot-noise in Contact Holes Fabricated by E-beam Lithography

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Laser Power Stabilization beyond the Shot Noise Limit Using Squeezed Light.

Henning Vahlbruch¹, Dennis Wilken¹, Moritz Mehmet¹

¹Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstrasse 38, 30167 Hannover, Germany.

Physical Review Letters

|November 10, 2018

Summary

Researchers enhanced laser power stability beyond classical limits using squeezed light. This breakthrough improves precision metrology without increasing detected light power, achieving unprecedented stability levels.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Area of Science:

Quantum optics
Precision measurement science

Background:

High laser power stability is crucial for precision metrology.
Classical power stability is limited by shot noise, which decreases with higher detected light power.
Detecting high laser powers presents significant technical challenges.

Purpose of the Study:

To demonstrate a nonclassical method for enhancing laser power stability.
To overcome the shot noise limit without increasing detected light power.
To achieve superior laser power stabilization for advanced metrology.

Main Methods:

Injection of a squeezed vacuum field of light into the laser system.
Utilizing a photodetector to measure photocurrent and laser power noise.
Operating at Fourier frequencies between 5 and 80 kHz.

Main Results:

Achieved a 9.4 dB improvement in laser power stability beyond the shot noise limit.
Reached a relative laser power noise of 2.0 × 10⁻⁸/√Hz with only 90.6 μA photocurrent.
Demonstrated performance equivalent to a tenfold increase in detected power in classical schemes.

Conclusions:

Squeezed light injection offers a novel pathway to enhance laser power stability.
This technique surpasses classical limitations, enabling higher precision in metrology.
Future potential exists for achieving stability levels of 4.2 × 10⁻¹⁰/√Hz with modest photocurrent.