A simple formula for pooling knowledge about a quantum system

Details A simple formula for pooling knowledge about a quantum system A simple formula for pooling knowledge about a quantum system

2005-03-24

arxiv.org/abs/quant-ph/0503193v1

Phys. Rev. A 72, 044101 (2005)

Physics

Quantum Physics

5 pages, Revtex4

Scientific paper

10.1103/PhysRevA.72.044101

When various observers obtain information in an independent fashion about a classical system, there is a simple rule which allows them to pool their knowledge, and this requires only the states-of-knowledge of the respective observers. Here we derive an equivalent quantum formula. While its realm of applicability is necessarily more limited, it does apply to a large class of measurements, and we show explicitly for a single qubit that it satisfies the intuitive notions of what it means to pool knowledge about a quantum system. This analysis also provides a physical interpretation for the trace of the product of two density matrices.

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