Manipulating and protecting entanglement by means of spin environments

被引：23

作者：

Apollaro, T. J. G. ^{[2
]}

Cuccoli, A. ^{[2
,3
]}

Di Franco, C. ^{[4
]}

Paternostro, M. ^{[1
]}

Plastina, F. ^{[5
,6
]}

Verrucchi, P. ^{[2
,7
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland

[2] Univ Firenze, Dipartimento Fis, I-50019 Sesto Fiorentino, FI, Italy

[3] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, FI, Italy

[4] Univ Coll Cork, Dept Phys, Cork, Ireland

[5] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, CS, Italy

[6] Ist Nazl Fis Nucl, Grp Coll Cosenza, I-87036 Arcavacata Di Rende, CS, Italy

[7] CNR, ISC, UO Dipartimento Fis, I-50019 Sesto Fiorentino, FI, Italy

来源：

NEW JOURNAL OF PHYSICS | 2010年 / 12卷

基金：

英国工程与自然科学研究理事会;

关键词：

SUDDEN-DEATH; QUANTUM; STATE;

D O I：

10.1088/1367-2630/12/8/083046

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the dynamical behavior of two initially entangled qubits, each locally coupled to an environment embodied by an interacting spin chain. We consider energy-exchange qubit-environment couplings resulting in rich and highly non-trivial entanglement dynamics. We obtain exact results for the time evolution of the concurrence between the two qubits and find that, by tuning the interaction parameters, one can freeze the dynamics of entanglement, therefore inhibiting their relaxation into the spin environments, as well as activate a sudden-death phenomenon. We also discuss the effects of an environmental quantum phase transition on the features of the two-qubit entanglement dynamics.

引用

页数：15

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