Abstract：
:Quantum coherence is one of the old but always important concepts in quantum mechanics, and now it has been regarded as a necessary resource for quantum information processing and quantum metrology. However, the question of how to quantify the quantum coherence has just been paid the attention recently (see, e.g., Baumgratz et al. PRL, 113. 140401 (2014)). In this paper we verify that the well-known quantum Fisher information (QFI) can be utilized to quantify the quantum coherence, as it satisfies the monotonicity under the typical incoherent operations and the convexity under the mixing of the quantum states. Differing from most of the pure axiomatic methods, quantifying quantum coherence by QFI could be experimentally testable, as the bound of the QFI is practically measurable. The validity of our proposal is specifically demonstrated with the typical phase-damping and depolarizing evolution processes of a generic single-qubit state, and also by comparing it with the other quantifying methods proposed previously.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Feng XN,Wei LFdoi
10.1038/s41598-017-15323-7subject
Has Abstractpub_date
2017-11-14 00:00:00pages
15492issue
1issn
2045-2322pii
10.1038/s41598-017-15323-7journal_volume
7pub_type
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