# Noise Refocusing in a Five-blade Neutron Interferometer

## TL;DR

This paper introduces a five-blade neutron interferometer design that is robust against both mechanical vibrations and dynamical phase noise, enhancing the stability and contrast of neutron interference experiments.

## Contribution

The paper presents a quantum information model of a novel five-blade neutron interferometer that resists both mechanical vibrations and dynamical phase noise, unlike previous designs.

## Key findings

- The five-blade interferometer is immune to low-frequency mechanical vibrations.
- It is also immune to dynamical phase noise.
- Compared to three- and four-blade designs, it offers improved noise resilience.

## Abstract

We provide a quantum information description of a proposed five-blade neutron interferometer geometry and show that it is robust against low frequency mechanical vibrations and dephasing due to the dynamical phase. The extent to which the dynamical phase affects the contrast in a neutron interferometer is experimentally shown. In our model, we consider the coherent evolution of a neutron wavepacket in an interferometer crystal blade and simulate the effect of mechanical vibrations and momentum spread of the neutron through the interferometer. The standard three-blade neutron interferometer is shown to be immune to dynamical phase noise but prone to noise from mechanical vibrations, the decoherence free subspace four-blade neutron interferometer is shown to be immune to mechanical vibration noise but prone to noise from the dynamical phase, while the proposed five-blade neutron interferometer is shown to be immune to both low-frequency mechanical vibration noise and dynamical phase noise.