• DOI:10.4064/BC73-0-4
Corpus ID: 818075

Instruments and mutual entropies in quantum information

@article{Barchielli2004InstrumentsAM,
  title={Instruments and mutual entropies in quantum information},
  author={Alberto Barchielli and G. Lupieri},
  journal={Banach Center Publications},
  year={2004},
  volume={73},
  pages={65-80}
}

Alberto Barchielli, G. Lupieri

Published 2004

Mathematics, Physics

Banach Center Publications

General quantum measurements are represented by instruments. In this paper the mathematical formalization is given of the idea that an instrument is a channel which accepts a quantum state as input and produces a probability and an a posteriori state as output. Then, by using mutual entropies on von Neumann algebras and the identification of instruments and channels, many old and new informational inequalities are obtained in a unified manner. Such inequalities involve various quantities which… CONTINUE READING

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