Displacement-noise-free interferometeric gravitational-wave detector using unidirectional neutrons with four speeds

TL;DR

This paper proposes a simplified neutron displacement-noise-free interferometer design with unidirectional neutrons at four speeds, aiming to improve gravitational wave detection by reducing mirror displacement noise at low frequencies.

Contribution

It introduces a new configuration of neutron DFI with unidirectional incidence at four speeds, simplifying the setup for experimental validation.

Findings

Simplified neutron DFI configuration with unidirectional incidence.

Reduction of mirror displacement noise at low frequencies.

Enhanced feasibility for proof-of-principle experiments.

Abstract

For further gravitational wave (GW) detections, it is significant to invent a technique to reduce all kinds of mirror displacement noise dominant at low frequencies for ground-based detectors. The neutron displacement-noise-free interferometer (DFI) is one of the tools to reduce all the mirror displacement noise at lower frequencies. In this paper, we describe a further simplified configuration of a neutron DFI in terms of neutron incidence direction. In the new configuration, neutrons enter the interferometer with unidirectional incidence at four speeds as opposed to two bidirectional incidences of opposite directions at two speeds as reported previously. This simplification of the neutron DFI is significant for proof-of-principle experiments.