Abstract
For the average information gain by a quantal measurement of the first kind, an expression is suggested for a lower bound, which turns out to be non-negative.
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References
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Pauli, W. (1933).Handbuch der Physik,XXIV/1, 152.
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Groenewold, H.J. A problem of information gain by quantal measurements. Int J Theor Phys 4, 327–338 (1971). https://doi.org/10.1007/BF00815357
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DOI: https://doi.org/10.1007/BF00815357