Statistical distance and Hilbert space
- 15 January 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 23 (2) , 357-362
- https://doi.org/10.1103/physrevd.23.357
Abstract
A concept of "statistical distance" is defined between different preparations of the same quantum system, or in other words, between different rays in the same Hilbert space. Statistical distance is determined entirely by the size of statistical fluctuations occurring in measurements designed to distinguish one state from another. It is not related, a priori, to the usual distance (or angle) between rays. One finds, however, that these two kinds of distance are in fact the same, a result which depends on certain peculiarities of quantum mechanics.Keywords
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