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.
- Received 12 April 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.090401
©2005 American Physical Society