Stroboscopic Variation Measurement

TL;DR

This paper introduces a novel stroboscopic variation measurement technique that surpasses the Standard Quantum Limit, offering a promising approach for high-precision position measurement in gravitational-wave detectors.

Contribution

It proposes a new measurement method combining stroboscopic and variation quantum measurement principles, overcoming limitations of existing techniques.

Findings

Achieves sensitivity below the Standard Quantum Limit

Approaches the Energetic Quantum Limit

Suitable for intracavity topologies in laser gravitational-wave antennas

Abstract

A new procedure of the linear position measurement which allows to obtain sensitivity better than the Standard Quantum Limit and close to the Energetic Quantum Limit is proposed and analyzed in details. Proposed method is based on the principles of stroboscopic quantum measurement and variation quantum measurement and allows to avoid main disadvantages of both these procedures. This method can be considered as a good candidate for use as a local position meter in the ``intracavity'' topologies of the laser gravitational-wave antennae.