Displacement- and Timing-Noise Free Gravitational-Wave Detection

TL;DR

This paper introduces new gravitational-wave detection schemes that are immune to displacement and timing noises, enabling more precise measurements using shot-noise-limited laser interferometry.

Contribution

It demonstrates the theoretical existence of displacement- and timing-noise-free detection schemes, expanding the potential for noise-resilient gravitational-wave observatories.

Findings

Detection schemes are insensitive to displacement and timing noises.

The number of signal channels scales as O(N^2), noise channels as O(N).

Schemes are realizable with shot-noise-limited laser interferometry.

Abstract

Motivated by a recently-invented scheme of displacement-noise-free gravitational-wave detection, we demonstrate the existence of gravitational-wave detection schemes insusceptible to both displacement and timing (laser) noises, and are thus realizable by shot-noise-limited laser interferometry. This is possible due to two reasons: first, gravitational waves and displacement disturbances contribute to light propagation times in different manners; second, for an N-detector system, the number of signal channels is of the order O(N^2), while the total number of timing- and displacement-noise channels is of the order O(N).