Speed Meter As a Quantum Nondemolition Measuring Device for Force
F.Ya. Khalili (Moscow State University), Yu. Levin (Caltech)
TL;DR
This paper explores the use of a speed meter as a quantum nondemolition device to measure force, potentially overcoming quantum noise limitations in gravitational wave detectors like LIGO.
Contribution
It proposes a practical speedmeter scheme that could surpass the Standard Quantum Limit for force measurement, offering an alternative to position-based methods.
Findings
Speedmeter scheme can potentially beat the SQL.
Practical implementation of quantum nondemolition measurement for force.
Addresses quantum noise issues in advanced gravitational wave detectors.
Abstract
Quantum noise is an important issue for advanced LIGO. Although it is in principle possible to beat the Standard Quantum Limit (SQL), no practical recipe has been found yet. This paper dicusses quantum noise in the context of speedmeter-a devise monitoring the speed of the testmass. The scheme proposed to overcome SQL in this case might be more practical than the methods based on monitoring position of the testmass.
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