Dynamics of quantum discord for a two-qubit system

Abstract

We study the dynamics of quantum discord of a two-qubit system coupled to a common structured reservoir at zero temperature. The conditions to maximize reservoir-induced quantum discord for the two-qubit system wiht an initially factorized state are derived. In particular, when the two qubits are placed in a lossy cavity, high values of quantum discord can be obtained in the dispersive regime, even in the bad-cavity limit. Finally, we show that under certain conditions, the quantum discord dynamics exhibits quantum beats.

Keywords

Entangle State / Quantum Correlation / Quantum Discord / Classical Correlation / Open Quantum System

References

[1] AlberG., BethT., HorodeckiM., HorodeckiP., HorodeckiR., RöttelerM., WeinfurterH., WernerR., ZeilingerA.. Introduction to Basic Theoretical Concepts and Experiments, 2001, Berlin, Springer-Verlag

[2] HorodeckiR., HorodeckiP., HorodeckiM., HorodeckiK.. Rev. Mod. Phys., 2009, 81: 865

[3] YangX., ZouH.-m.. Optoelectronics Letters, 2010, 6: 144

[4] ZhangD.-y., TangS.-q., WangX.-w., XieL., ZhanX.-g., ChenY.-h.. Optoelectronics Letters, 2012, 8: 150

[5] HorodeckiM., HorodeckiP., HorodeckiR., OppenheimJ., SenA., SenU., Synak-RadtkeB.. Phys. Rev. A, 2005, 71: 062307

[6] NisetJ., CerfN. J.. Phys. Rev. A, 2006, 74: 052103

[7] MeyerD.. Phys. Rev. Lett., 2000, 85: 2014

[8] LanyonB. P., BarbieriM., AlmeidaM. P., WhiteA. G.. Phys. Rev. Lett., 2008, 101: 012008

[9] WerlangT., SouzaS., FanchiniF. F., Villas BoasC. J.. Phys. Rev. A, 2009, 80: 024103

[10] BreuerH. P., LaineE. M., PiiloJ.. Phys. Rev. Lett., 2009, 103: 210401

[11] LaineE. M., PiiloJ., BreuerH. P.. Phys. Rev. A, 2010, 81: 062115

[12] WangB., XuZ. Y., ChenZ. Q., FengM.. Phys. Rev. A, 2010, 81: 014101

[13] MazzolaL., JiiloP., ManiscalcoS.. Phys. Rev. Lett., 2010, 104: 200401

[14] BellomoB., FrancoR. L., CompagnoG.. Phys. Rev. Lett., 2007, 99: 160502

[15] ManiscalcoS., FrancicaF., ZaffinoR. L., LoGulloN. L., PlastinaF.. Phys. Rev. Lett., 2008, 100: 090503

[16] MazieroJ., CéleriL. C., SerraR. M., VedralV.. Phys. Rev. A, 2009, 80: 044102

[17] VedralV.. Phys. Rev. Lett., 2003, 90: 050401

[18] OllivierH., ZurekW. H.. Phys. Rev. Lett., 2001, 88: 017901

[19] KaszlikowskiD., SenDeA., SenU., VedralV., WinterA.. Phys. Rev. Lett., 2008, 101: 070502

[20] PianiM., HorodeckiP., HorodeckiR.. Phys. Rev. Lett., 2008, 100: 090502