Quantum speed limit based on the bound of Bures angle.

Abstract:

:In this paper, we investigate the unified bound of quantum speed limit time in open systems based on the modified Bures angle. This bound is applied to the damped Jaynes-Cummings model and the dephasing model, and the analytical quantum speed limit time is obtained for both models. As an example, the maximum coherent qubit state with white noise is chosen as the initial states for the damped Jaynes-Cummings model. It is found that the quantum speed limit time in both the non-Markovian and the Markovian regimes can be decreased by the white noise compared with the pure state. In addition, for the dephasing model, we find that the quantum speed limit time is not only related to the coherence of initial state and non-Markovianity, but also dependent on the population of initial excited state.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wu SX,Yu CS

doi

10.1038/s41598-020-62409-w

subject

Has Abstract

pub_date

2020-03-26 00:00:00

pages

5500

issue

1

issn

2045-2322

pii

10.1038/s41598-020-62409-w

journal_volume

10

pub_type

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