A general theorem as a necessary condition for the separability of quantum states in both finite and infinite dimensional systems, based on concave-function uncertainty relations, is derived. Two special cases of the general theorem are stronger than two known entanglement criteria based on the Shannon entropic uncertainty relation and the Landau-Pollak uncertainty relation, respectively; other special cases are able to detect entanglement where some famous entanglement criteria fail.
Physical Review A
- Pub Date:
- July 2010
- Entanglement production characterization and manipulation;
- Entanglement and quantum nonlocality;
- Foundations of quantum mechanics;
- measurement theory