Unveiling contextual realities by microscopically entangling a neutron

J. Shen, S. J. Kuhn, R. M. Dalgliesh, V. O. Haan, N. Geerits, A. A. M. Irfan, F. Li, S. Lu, S. R. Parnell, J. Plomp, A. A. Well, A. Washington, D. V. Baxter, G. Ortiz, W. M. Snow and R. Pynn ()
Additional contact information
J. Shen: Indiana University
S. J. Kuhn: Indiana University
R. M. Dalgliesh: ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory
V. O. Haan: BonPhysics Research and Investigations BV
N. Geerits: Atominstitut, TU Wien
A. A. M. Irfan: Indiana University
F. Li: Neutron Sciences Directorate, Oak Ridge National Laboratory
S. Lu: Indiana University
S. R. Parnell: Delft University of Technology
J. Plomp: Delft University of Technology
A. A. Well: Delft University of Technology
A. Washington: ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory
D. V. Baxter: Indiana University
G. Ortiz: Indiana University
W. M. Snow: Indiana University
R. Pynn: Indiana University

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract The development of qualitatively new measurement capabilities is often a prerequisite for critical scientific and technological advances. Here we introduce an unconventional quantum probe, an entangled neutron beam, where individual neutrons can be entangled in spin, trajectory and energy. The spatial separation of trajectories from nanometers to microns and energy differences from peV to neV will enable investigations of microscopic magnetic correlations in systems with strongly entangled phases, such as those believed to emerge in unconventional superconductors. We develop an interferometer to prove entanglement of these distinguishable properties of the neutron beam by observing clear violations of both Clauser-Horne-Shimony-Holt and Mermin contextuality inequalities in the same experimental setup. Our work opens a pathway to a future of entangled neutron scattering in matter.

Date: 2020
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DOI: 10.1038/s41467-020-14741-y

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