Two quantum analogues of Fisher information from a large deviation viewpoint of quantum estimation

Abstract

We discuss two quantum analogues of Fisher information, symmetric logarithmic derivative (SLD) Fisher information and Kubo-Mori-Bogoljubov (KMB) Fisher information from a large deviation viewpoint of quantum estimation and prove that the former gives the true bound and the latter gives the bound of consistent superefficient estimators. In another comparison, it is shown that the difference between them is characterized by the change of the order of limits.

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References in corpus (4)

• Estimating the spectrum of a density operator
• Quantum universal variable-length source coding
• Exponents of quantum fixed-length pure state source coding
• Extending the Fisher metric to density matrices

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