Generating and protecting correlated quantum states under collective dephasing
Quantum Physics
2016-07-13 v2 Atomic Physics
Abstract
We study the collective dephasing process of a system of non-interacting atomic qubits, immersed in a spatially uniform magnetic field of fluctuating intensity. The correlation properties of bipartite states are analysed based on a geometric representation of the state space. Particular emphasis is put on the dephasing-assisted generation of states with a high correlation rank, which can be related to discord-type correlations and allow for direct applications in quantum information theory. Finally we study the conditions that ensure the robustness of initial entanglement and discuss the phenomenon of time-invariant entanglement.
Cite
@article{arxiv.1602.08973,
title = {Generating and protecting correlated quantum states under collective dephasing},
author = {Edoardo G. Carnio and Andreas Buchleitner and Manuel Gessner},
journal= {arXiv preprint arXiv:1602.08973},
year = {2016}
}
Comments
29 pages, 5 figures