How much state assignments can differ

Details How much state assignments can differ How much state assignments can differ

2002-08-13

arxiv.org/abs/quant-ph/0208088v1

Physics

Quantum Physics

4 pages LaTeX2e. To appear in proceedings of QCMC 2002

Scientific paper

The state that an observer attributes to a quantum system depends on the information available to that observer. If two or more observers have different information about a single system, they will in general assign different states. Is there any restriction on what states can be assigned, given reasonable assumptions about how the observers use their information? We derive necessary and sufficient conditions for a group of general density matrices to characterize what different people may know about one and the same physical system. These conditions are summarized by a single criterion, which we term compatibility.

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