• Open Access

Coherence optimization in neutron interferometry through defocusing

J. Nsofini, D. Sarenac, D. G. Cory, and D. A. Pushin
Phys. Rev. A 99, 043614 – Published 12 April 2019

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. However, unlike the standard three-blade Mach-Zehnder NI the ideal contrast of this four-blade NI geometry is less than 1. 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.

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  • Received 9 February 2019

DOI:https://doi.org/10.1103/PhysRevA.99.043614

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & OpticalNuclear Physics

Authors & Affiliations

J. Nsofini1,2,*, D. Sarenac1,2, D. G. Cory2,3,4,5, and D. A. Pushin1,2

  • 1Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L3G1
  • 2Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, Canada N2L3G1
  • 3Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L3G1
  • 4Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L2Y5
  • 5Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8

  • *jnsofini@uwaterloo.ca

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Issue

Vol. 99, Iss. 4 — April 2019

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