Quantum Measurement in GW Detectors

Application of quantum measurement theory to kilometer-scale gravitational-wave interferometers nearing the quantum-noise limit of light.

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A review of quantum measurement theory in the very form it finds application in gravitational-wave detection, by Stefan Danilishin and Farid Khalili.
Improvements in sensitivity have propelled the field to the point where the quantum behavior of kilometer-long interferometers starts to matter.
The time when sensitivity will be mainly limited by the quantum noise of light is around the corner, making its reduction a necessity.