Violation of a Leggett-Garg Inequality Using Ideal Negative Measurements in Neutron Interferometry
Abstract
Leggett-Garg inequalities (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. We report on an experiment that demonstrates the violation of an LGI with neutrons. The final measured value of the Leggett-Garg correlator K =1.120 ±0.007 (stat )±0.019 (sys ) , obtained in a neutron interferometric experiment, is clearly above the limit K =1 predicted by macrorealistic theories. The experimental results are analyzed within the framework of dynamical theory of neutron diffraction, evidently reproducing the obtained values.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2024
- DOI:
- 10.1103/PhysRevLett.132.260201
- arXiv:
- arXiv:2307.04409
- Bibcode:
- 2024PhRvL.132z0201K
- Keywords:
-
- Quantum Physics
- E-Print:
- 6 pages, 8 figures