QND measurements for future gravitational-wave detectors
Yanbei Chen, Stefan L. Danilishin, Farid Ya. Khalili, Helge, M\"uller-Ebhardt
TL;DR
This paper reviews quantum non-demolition measurement schemes that can surpass the Standard Quantum Limit in gravitational-wave detectors, potentially enabling more sensitive third-generation observatories.
Contribution
It introduces and discusses various QND measurement schemes that could improve the sensitivity of future gravitational-wave detectors beyond current quantum limits.
Findings
QND schemes can significantly surpass the Standard Quantum Limit
Potential integration of QND techniques in third-generation detectors
Broadband quantum noise reduction achieved by these schemes
Abstract
Second-generation interferometric gravitational-wave detectors will be operating at the Standard Quantum Limit, a sensitivity limitation set by the trade off between measurement accuracy and quantum back action, which is governed by the Heisenberg Uncertainty Principle. We review several schemes that allows the quantum noise of interferometers to surpass the Standard Quantum Limit significantly over a broad frequency band. Such schemes may be an important component of the design of third-generation detectors.
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