Generating and protecting correlated quantum states under collective dephasing

Year: 2016

Authors: Carnio EG., Buchleitner A., Gessner M.

Autors Affiliation: Univ Freiburg, Inst Phys, Hermann Herder Str 3, D-79104 Freiburg, Germany;‎ Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England; Univ Freiburg, Freiburg Inst Adv Studies, Albertstr 19, D-79104 Freiburg, Germany;‎ CNR INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy;‎ LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy;‎ Ist Nazl Ric Metrol INRiM, I-10135 Turin, Italy

Abstract: Westudy 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 discordtype 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.


Volume: 18      Pages from: 073010-1  to: 073010-19

KeyWords: entanglement; quantum correlations; dephasing; decoherence
DOI: 10.1088/1367-2630/18/7/073010

Citations: 12
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