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

Abstract

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.

6 pages, 8 figures

References in corpus (11)

• A Spin Entanglement Witness for Quantum Gravity
• Gravitationally-induced entanglement between two massive particles is sufficient evidence of quantum effects in gravity
• Macroscopicity of Mechanical Quantum Superposition States
• Ideal negative measurements in quantum walks disprove theories based on classical trajectories
• Signatures of quantum behavior in single-qubit weak measurements
• A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states
• The Leggett-Garg inequality in electron interferometers
• Decoherence and maximal violations of the Leggett-Garg inequality
• Leggett-Garg inequalities for testing quantumness of gravity
• Quantifying the presence of a neutron in the paths of an interferometer
• Direct experimental test of commutation relation via weak value

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• Assessing the dynamical assumptions in Tsirelson inequality tests of non-classicality in harmonic oscillators
• Spatial Leggett-Garg inequalities
• Shared randomness allows violation of macroscopic realism using a single measurement