| Autor: |
Majidy, Shayan-Shawn, Katiyar, Hemant, Anikeeva, Galit, Halliwell, Jonathan, Laflamme, Raymond |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. A 100, 042325 (2019) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.100.042325 |
| Popis: |
Macroscopic realism (MR) is the view that a system may possess definite properties at any time independent of past or future measurements, and may be tested experimentally using the Leggett-Garg inequalities (LGIs). In this work we advance the study of LGIs in two ways using experiments carried out on a nuclear magnetic resonance spectrometer. Firstly, we addresses the fact that the LGIs are only necessary conditions for MR but not sufficient ones. We implement a recently-proposed test of necessary and sufficient conditions for MR which consists of a combination of the original four three-time LGIs augmented with a set of twelve two-time LGIs. We explore different regimes in which the two- and three-time LGIs may each be satisfied or violated. Secondly, we implement a recent proposal for a measurement protocol which determines the temporal correlation functions in an approximately non-invasive manner. It employs a measurement of the velocity of a dichotomic variable $Q$, continuous in time, from which a possible sign change of $Q$ may be determined in a single measurement of an ancilla coupled to the velocity. This protocol involves a significantly different set of assumptions to the traditional ideal negative measurement protocol and a comparison with the latter is carried out. |
| Databáze: |
arXiv |
| Externí odkaz: |
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