Detection of Macroscopic Entanglement by Correlation of Local Observables
Quantum Physics
2016-10-24 v3 Superconductivity
Atomic Physics
Abstract
We propose a correlation of local observables on many sites in macroscopic quantum systems. By measuring the correlation one can detect, if any, superposition of macroscopically distinct states, which we call macroscopic entanglement, in arbitrary quantum states that are (effectively) homogeneous. Using this property, we also propose an index of macroscopic entanglement.
Cite
@article{arxiv.quant-ph/0504086,
title = {Detection of Macroscopic Entanglement by Correlation of Local Observables},
author = {Akira Shimizu and Tomoyuki Morimae},
journal= {arXiv preprint arXiv:quant-ph/0504086},
year = {2016}
}
Comments
Although the index q was proposed for mixed states, it is also applicable to pure states, on which we fix minor bugs (that will be reported in PRL as erratum). The conclusions of the paper remain unchanged. (4 pages, no figures.)