Abstract
A zero-area four-blade perfect crystal neutron interferometer (NI) possess a decoherence-free subspace (DFS) for low-frequency mechanical vibrations and thus is easier to site. %has the potential to broaden the application of crystal-based neutron interferometry to a higher number of neutron sources. However, unlike the standard three-blade Mach-Zehnder NI the ideal contrast of this four-blade NI geometry is less than one. By applying a recently introduced quantum information model for dynamical diffraction we show that the contrast for the four-blade DFS NI can be increased by offsetting the focusing condition. The contrast optimization leads to an NI geometry where the distances between the centers of the blades are equidistant. An experiment is proposed to verify the increase in contrast.
Highlights
Perfect crystal neutron interferometry is a powerful tool for the characterization of materials and the precise measurements of fundamental constants from condensed matter physics and the Standard Model of particle physics [1,2,3,4,5,6,7,8,9,10]
By applying a recently introduced quantum information model for dynamical diffraction we show that the contrast for the four-blade decoherence-free subspace (DFS) neutron interferometer (NI) can be increased by offsetting the focusing condition
We propose an experiment to verify the increase in contrast with the original DFS NI geometry
Summary
Perfect crystal neutron interferometry is a powerful tool for the characterization of materials and the precise measurements of fundamental constants from condensed matter physics and the Standard Model of particle physics [1,2,3,4,5,6,7,8,9,10]. In 2011, a unique design of a zero-area perfect crystal four-blade NI, commonly referred to as the DFS NI, was experimentally demonstrated to have a subspace which protects information from low-frequency mechanical vibrational noise [14]. Its unique design overcame a significant obstacle which limits the application of perfect crystal neutron interferometry. In this work we show that by relaxing the first symmetry condition that demands the two paths inside the NI to refocused on the last blade, we show that the contrast increases to. We propose an experiment to verify the increase in contrast with the original DFS NI geometry.
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