Simple formula for pooling knowledge about a quantum system

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Jacobs, Kurt
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2005
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Abstract

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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Physical Review A

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72

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© 2005 American Physical Society. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.

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History and Archaeology

Mathematical Sciences

Physical Sciences

Chemical Sciences

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