Emergent Quantum Mechanics 2015 | |
About what can be witnessed by a Leggett—Garg inequality test: modeling its violation | |
Moreira, Saulo V.^1 ; Keller, Arne^2 ; Coudreau, Thomas^1 ; Milman, Pérola^1 | |
Univ. Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162, CNRS, Paris | |
F-75205, France^1 | |
Univ. Paris Sud, Institut des Sciences Moléculaires d'Orsay (UMR 8214 CNRS), Orsay | |
F-91405, France^2 | |
关键词: Invasiveness; Operational model; Physical systems; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/701/1/012029/pdf DOI : 10.1088/1742-6596/701/1/012029 |
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来源: IOP | |
【 摘 要 】
The Leggett-Garg inequality is a widely used test of the "quantumness" of a system, and involves correlations between measurements realized at different times. According to its widespread interpretation, a violation of the Legget-Garg inequality disproves macroscopic realism and non-invasiveness. Nevertheless, recent results point out that macroscopic realism is a model dependent notion and that one should always be able to attribute to invasiveness a violation of a Legget-Garg inequality. This opens some natural questions: how to provide such an attribution in a systematic way? How can apparent macroscopic realism violation be recast into a dimensional independent invasiveness model? The present work answers these questions by introducing an operational model where the effects of invasiveness are controllable through a parameter associated with what is called the measurability of the physical system. Such a parameter leads to different generalized measurements that can be associated with the dimensionality of a system, to measurement errors or to back action.
【 预 览 】
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About what can be witnessed by a Leggett—Garg inequality test: modeling its violation | 563KB | download |