We introduce measures of quantum coherence as the speed of evolution of a system under decoherence. That is, coherence is the ability to estimate a dephasing channel, quantified by the quantum Fisher information. We extend the analysis to interferometric noise estimation, proving that quantum discord is the minimum sensitivity to local dephasing. A physically motivated set of free operations for discord is proposed. The amount of discord created by strictly incoherent operations is upper bounded by the initial coherence.
Coherence and quantum correlations measure sensitivity to dephasing channels / Yadin, B.; Bogaert, P.; Susa, C. E.; Girolami, D.. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 99:1(2019), p. 012329.
|Titolo:||Coherence and quantum correlations measure sensitivity to dephasing channels|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevA.99.012329|
|Appare nelle tipologie:||1.1 Articolo in rivista|