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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Extracting Information from Qubit-Environment Correlations

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Reina, John H. [1, 2] ; Susa, Cristian E. [1, 2] ; Fanchini, Felipe F. [3]
Total Authors: 3
[1] Univ Valle, Dept Fis, Cali 25360 - Colombia
[2] Ctr Bioinformat & Photon CIBioFI, Cali - Colombia
[3] UNESP, Fac Ciencias, Dept Fis, BR-17033360 Bauru, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 4, DEC 17 2014.
Web of Science Citations: 12

Most works on open quantum systems generally focus on the reduced physical system by tracing out the environment degrees of freedom. Here we show that the qubit distributions with the environment are essential for a thorough analysis, and demonstrate that the way that quantum correlations are distributed in a quantum register is constrained by the way in which each subsystem gets correlated with the environment. For a two-qubit system coupled to a common dissipative environment epsilon, we show how to optimise interqubit correlations and entanglement via a quantification of the qubit-environment information flow, in a process that, perhaps surprisingly, does not rely on the knowledge of the state of the environment. To illustrate our findings, we consider an optically-driven bipartite interacting qubit AB system under the action of epsilon. By tailoring the light-matter interaction, a relationship between the qubits early stage disentanglement and the qubit-environment entanglement distribution is found. We also show that, under suitable initial conditions, the qubits energy asymmetry allows the identification of physical scenarios whereby qubit-qubit entanglement minima coincide with the extrema of the A epsilon and B epsilon entanglement oscillations. (AU)

FAPESP's process: 12/50464-0 - A study of quantum correlations in open quantum systems
Grantee:Felipe Fernandes Fanchini
Support type: Regular Research Grants
FAPESP's process: 08/57856-6 - National Institute of Science and Technology - Quantum Information
Grantee:Amir Ordacgi Caldeira
Support type: Research Projects - Thematic Grants