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Direct approach to quantum extensions of Fisher information

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Abstract

By manipulating classical Fisher information and employing various derivatives of density operators, and using entirely intuitive and direct methods, we introduce two families of quantum extensions of Fisher information that include those defined via the symmetric logarithmic derivative, via the right logarithmic derivative, via the Bogoliubov-Kubo-Mori derivative, as well as via the derivative in terms of commutators, as special cases. Some fundamental properties of these quantum extensions of Fisher information are investigated, a multi-parameter quantum Cramér-Rao inequality is established, and applications to characterizing quantum uncertainty are illustrated.

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Authors and Affiliations

  1. Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, 100080, China

    Chen Ping & Luo Shunlong

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  1. Chen Ping
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  2. Luo Shunlong
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Correspondence to Luo Shunlong.

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Chen, P., Luo, S. Direct approach to quantum extensions of Fisher information. Front. Math. China 2, 359–381 (2007). https://doi.org/10.1007/s11464-007-0023-4

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  • DOI: https://doi.org/10.1007/s11464-007-0023-4

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