Neutron-state entanglement with overlapping paths

Kuhn, S. J.; McKay, S.; Shen, J.; Geerits, N.; Dalgliesh, R. M.; Dees, E.; Irfan, A. A. M.; Li, F.; Lu, S.; Vangelista, V.; Baxter, D. V.; Ortiz, G.; Parnell, S. R.; Snow, W. M.; Pynn, R.

doi:10.1103/PhysRevResearch.3.023227

Title: Neutron-state entanglement with overlapping paths

Journal Article · Tue Jun 22 00:00:00 EDT 2021 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.3.023227· OSTI ID:1798002

Kuhn, S. J.;

; Shen, J.;

; Dalgliesh, R. M.; Dees, E.; Irfan, A. A. M.;

;

; Vangelista, V.; Baxter, D. V.;

; Parnell, S. R.;

;

The development of direct probes of entanglement is integral to the rapidly expanding field complex quantum materials. Here we test the robustness of entangled neutrons as a quantum probe by measuring the Clauser-Horne-Shimony-Holt contextuality witness while varying the beam properties. Specifically, we prove that the entanglement of the spin and path subsystems of individual neutrons prepared in two different experiments using two different apparatuses persists even after varying the entanglement length, coherence length, and neutron energy difference of the paths. The two independent apparatuses acting as entangler-disentangler pairs are static-field magnetic Wollaston prisms and resonance- field radio frequency flippers. Our results show that the spatial and energy properties of the neutron beam may be significantly altered without reducing the contextuality witness value below the Tsirelson bound, meaning that maximum entanglement is preserved. We also show that two paths may be considered distinguishable even when separated by less than the neutron coherence length. This work is the key step in the realization of the new modular, robust technique of entangled neutron scattering.

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Research Organization:: Adelphi Technology Inc., Redwood City, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of Commerce; National Science Foundation (NSF)

Contributing Organization:: Indiana University; Oak Ridge National Laboratory (ORNL); Rutherford Appleton Laboratory (RAL); University of Vienna; Delft University of Technology

Grant/Contract Number:: AC05-00OR22725; SC0009584; 70NANB15H259; PHY-1914405

OSTI ID:: 1798002

Alternate ID(s):: OSTI ID: 1787338; OSTI ID: 1817475

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Vol. 3 Journal Issue: 2; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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