Abstract
A pure quantum state which when split in any way cannot violate Bell’s inequality is termed a Bell state. Such a state may be considered as classical a state as possible. We show that for the radiation field the Bell state is unique, and is the Glauber coherent state. The formalism allows the interpretation of a local measurement in an entangled state as a measurement with an extended apparatus on a product state.
- Received 12 November 1991
DOI:https://doi.org/10.1103/PhysRevA.46.5363
©1992 American Physical Society