On compatibility and improvement of different quantum state assignments

Details On compatibility and improvement of different quantum state assignments On compatibility and improvement of different quantum state assignments

2004-05-23

arxiv.org/abs/quant-ph/0405135v1

J. Phys. A: Math. Gen. 37 (2004) 1-8

Physics

Quantum Physics

8 pages

Scientific paper

10.1088/0305-4470/37/19/011

When Alice and Bob have different quantum knowledges or state assignments (density operators) for one and the same specific individual system, then the problems of compatibility and pooling arise. The so-called first Brun-Finkelstein-Mermin (BFM) condition for compatibility is reobtained in terms of possessed or sharp (i. e., probability one) properties. The second BFM condition is shown to be generally invalid in an infinite-dimensional state space. An argument leading to a procedure of improvement of one state assifnment on account of the other and vice versa is presented.

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