Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain

被引:98
作者
Apollaro, Tony J. G. [1 ]
Di Franco, Carlo [2 ]
Plastina, Francesco [3 ,4 ]
Paternostro, Mauro [5 ]
机构
[1] Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, FI, Italy
[2] Univ Coll Cork, Dept Phys, Cork, Ireland
[3] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, CS, Italy
[4] INFN, Grp Coll Cosenza, Cosenza, Italy
[5] Queens Univ, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland
来源
PHYSICAL REVIEW A | 2011年 / 83卷 / 03期
基金
英国工程与自然科学研究理事会;
关键词
MAPS;
D O I
10.1103/PhysRevA.83.032103
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Using recently proposed measures for non-Markovianity [H.-P. Breuer, E. M. Laine, and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)], we study the dynamics of a qubit coupled to a spin environment via an energy-exchange mechanism. We show the existence of a point, in the parameter space of the system, where the qubit dynamics is effectively Markovian and that such a point separates two regions with completely different dynamical behaviors. Indeed, our study demonstrates that the qubit evolution can in principle be tuned from a perfectly forgetful one to a deep non-Markovian regime where the qubit is strongly affected by the dynamical backaction of the environmental spins. By means of a theoretical quantum process tomography analysis, we provide a complete and intuitive characterization of the qubit channel.
引用
收藏
页数:10
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