Spin-energy entanglement of a time-focused neutron

Leiner, Jon C.; Kuhn, Steve J.; McKay, Samuel; Jochum, Johanna K.; Li, Fankang; Irfan, Abu Ashik M.; Funama, Fumiaki; Mettus, Denis; Beddrich, Lukas; Franz, Christian; Shen, Jiazhou; Parnell, Steven R.; Dalgliesh, Robert M.; Loyd, Matthew; Geerits, Niels; Ortiz, Gerardo; Pfleiderer, Christian; Pynn, Roger

doi:10.1103/physrevapplied.22.l031005

Title: Spin-energy entanglement of a time-focused neutron

Journal Article · 24 September 2024 · Physical Review Applied

DOI: https://doi.org/10.1103/physrevapplied.22.l031005 · OSTI ID:2455090

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Technische Univ. München, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Indiana Univ., Bloomington, IN (United States)
Technische Univ. München, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
Indiana Univ., Bloomington, IN (United States); Univ. of Waterloo, ON (Canada)
Forschungszentrum Juelich (Germany)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Delft Univ. of Technology (Netherlands)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
Technische Univ. Wien (Austria)
Indiana Univ., Bloomington, IN (United States); Institute for Advanced Study, Princeton, NJ (United States)
Technische Univ. München, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ), Center for Quantum Engineering (ZQE), and Munich Center for Quantum Science and Technology (MCQST)
Indiana Univ., Bloomington, IN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Intraparticle entanglement of individual particles such as neutrons could enable another class of scattering probes that are sensitive to entanglement in quantum systems and materials. Here, in this work, we present experimental results demonstrating quantum contextuality as a result of entanglement between the spin and energy modes (i.e., degrees of freedom) of single neutrons in a beam using a pair of resonant radio-frequency neutron spin flippers in the modulated intensity with zero effort configuration. We verified the mode entanglement by measuring a Clauser-Horne-Shimony-Holt contextuality witness S defined in the spin and energy subsystems, observing a clear breach of the classical bound of |S| ≤ 2, obtaining S = 2.40 ± 0.02. These entangled beams could enable alternative approaches for directly probing dynamics and entanglement in quantum materials whose low-energy excitation scales match those of the incident entangled neutron.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)

Grant/Contract Number:: AC05-00OR22725; SC0014664; SC0018453; SC0021482; SC0023624

OSTI ID:: 2455090

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 3 Vol. 22; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
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Title: Spin-energy entanglement of a time-focused neutron

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