Magnetic susceptibility as a macroscopic entanglement witness
- Author(s)
- Marcin Wiesniak, Vlatko Vedral, Caslav Brukner
- Abstract
We show that magnetic susceptibility can reveal spin entanglement between individual constituents of a solid, while magnetization describes their local properties. We then show that magnetization and its variance (equivalent to magnetic susceptibility for a wide class of systems) satisfy complementary relation in the quantum-mechanical sense. It describes sharing of (quantum) information in the solid between spin entanglement and local properties of its individual constituents. Magnetic susceptibility is shown to be a macroscopic (thermodynamical) spin entanglement witness that can be applied without complete knowledge of the specific model (Hamiltonian) of the solid. ΠIOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
- Organisation(s)
- External organisation(s)
- Erwin Schrödinger Institut
- Journal
- New Journal of Physics
- Volume
- 7
- No. of pages
- 8
- ISSN
- 1367-2630
- DOI
- https://doi.org/10.1088/1367-2630/7/1/258
- Publication date
- 2005
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103026 Quantum optics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e8b07e0c-c4e0-4147-880c-cec16829d492