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Updated: Oct 6, 2025
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Optimal Control of Coherent Light Scattering for Binary Decision Problems
Dorian Bouchet1, Lukas M Rachbauer2, Stefan Rotter2
1Université Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.
Physical Review Letters
|January 14, 2022
Summary
Researchers minimized the Helstrom bound, a fundamental limit in quantum sensing, by using tailored light fields. This significantly reduces the number of photons needed to detect targets in complex scattering environments.
Area of Science:
- Quantum information science
- Optical metrology
- Statistical decision theory
Background:
- Quantum noise imposes fundamental limits on measurement precision, known as the Helstrom bound.
- Detecting targets in scattering media is challenging due to signal degradation.
Purpose of the Study:
- To develop a general framework for calculating and minimizing the Helstrom bound.
- To experimentally demonstrate optimized probe fields for enhanced target detection.
Main Methods:
- Utilizing coherent probe fields with tailored spatial distributions.
- Employing scattering matrix measurements to identify optimal field configurations.
- Experimental validation in a system with disordered scattering media.
Main Results:
- A general method to calculate and minimize the Helstrom bound was established.
- Optimal light field distributions were identified using scattering matrix measurements.
- A reduction of over 2 orders of magnitude in required photons for target detection was achieved.
Conclusions:
- Tailored coherent probe fields can overcome fundamental quantum limits in sensing.
- The developed framework offers a pathway to significantly improve sensitivity in scattering environments.
- This approach has implications for various quantum sensing and imaging applications.
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