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General Relativity and Quantum Cosmology, gr-qc
Abstract:
Quantum fluctuation of light limits the sensitivity of advanced laser
interferometric gravitational-wave detectors. It is one of the principal
obstacles on the way towards the next-generation gravitational-wave
observatories. The envisioned significant improvement of the detector
sensitivity requires using quantum non-demolition measurement and back-action
evasion techniques, which allow us to circumvent the sensitivity limit imposed
by the Heisenberg uncertainty principle. In our previous review article:
"Quantum measurement theory in gravitational-wave detectors"' [Living Rev.
Relativity 15, 5 (2012)], we laid down the basic principles of quantum
measurement theory and provided the framework for analysing the quantum noise
of interferometers. The scope of this paper is to review novel techniques for
quantum noise suppression proposed in the recent years and put them in the same
framework. Our delineation of interferometry schemes and topologies is intended
as an aid in the process of selecting the design for the next-generation
gravitational-wave observatories.
