Conditions for Quantum Violation of Macroscopic Realism
- Author(s)
- Johannes Kofler, Caslav Brukner
- Abstract
Why do we not experience a violation of macroscopic realism in everyday life. Normally, no violation can be seen either because of decoherence or the restriction of coarse-grained measurements, transforming the time evolution of any quantum state into a classical time evolution of a statistical mixture. We find the sufficient condition for these classical evolutions for spin systems under coarse-grained measurements. However, there exist "nonclassical" Hamiltonians whose time evolution cannot be understood classically, although at every instant of time the quantum state appears as a classical mixture. We suggest that such Hamiltonians are unlikely to be realized in nature because of their high computational complexity.
- Organisation(s)
- Quantum Optics, Quantum Nanophysics and Quantum Information
- Journal
- Physical Review Letters
- Volume
- 101
- No. of pages
- 4
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/PhysRevLett.101.090403
- Publication date
- 2008
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103026 Quantum optics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/conditions-for-quantum-violation-of-macroscopic-realism(068dd5af-001a-4909-89a7-af18bc7221bd).html