Energetic Quantum Limit in Large-Scale Interferometers
Vladimir B. Braginsky (1), Mikhail L. Gorodetsky (1), Farid Ya., Khalili (1), Kip S. Thorne (2) ((1) Physics Faculty, Moscow State, University, (2) Theoretical Astrophysics, California Institute of Technology)
TL;DR
This paper discusses the energetic quantum limit in large-scale interferometers, highlighting the power constraints for surpassing the standard quantum limit and the potential of intracavity readout schemes to mitigate these constraints.
Contribution
It introduces the concept of the energetic quantum limit for different interferometer topologies and analyzes how intracavity readout schemes can overcome power limitations.
Findings
Standard topologies require impractically high power to beat the SQL
Intracavity readout schemes can achieve SQL surpassing with manageable power
The energetic quantum limit varies with interferometer configuration
Abstract
For each optical topology of an interferometric gravitational wave detector, quantum mechanics dictates a minimum optical power (the ``energetic quantum limit'') to achieve a given sensitivity. For standard topologies, when one seeks to beat the standard quantum limit by a substantial factor, the energetic quantum limit becomes impossibly large. Intracavity readout schemes may do so with manageable optical powers.
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