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Violation of a Leggett-Garg inequality using ideal negative measurements in neutron interferometry

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arxiv 2307.04409 v1 pith:2YYKNWF2 submitted 2023-07-10 quant-ph

Elisabeth Kreuzgruber , Richard Wagner , Niels Geerits , Hartmut Lemmel , Stephan Sponar This is my paper · ORCID
classification quant-ph
keywords experimentinequalityleggett-garglgismeasurementsneutronviolationabove
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We report on an experiment that demonstrates the violation of a Leggett-Garg inequality (LGI) with neutrons. LGIs have been proposed in order to assess how far the predictions of quantum mechanics defy macroscopic realism. With LGIs, correlations of measurements performed on a single system at different times are described. The measured value of K = 1.120 +/- 0.007, obtained in a neutron interferometric experiment, is clearly above the limit K = 1 predicted by macro-realistic theories.

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  1. Violation of the Leggett-Garg inequality in photon-graviton conversion

    gr-qc 2026-01 conditional novelty 4.0 of 10

    Photon-graviton conversion in a magnetic field produces a Leggett-Garg inequality violation, but the violation follows from the generic two-level oscillation formula and an invasive measurement protocol, so it is not ...

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