固态核四极量子比特的动态退相干控制

Dynamic decoherence control of a solid-state nuclear-quadrupole qubit.

作者信息

Fraval E, Sellars M J, Longdell J J

机构信息

Laser Physics Centre, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.

出版信息

Phys Rev Lett. 2005 Jul 15;95(3):030506. doi: 10.1103/PhysRevLett.95.030506.

DOI:10.1103/PhysRevLett.95.030506

PMID:16090731

Abstract

We report on the application of a dynamic decoherence control pulse sequence on a nuclear-quadrupole transition in Pr3+:Y(2)SiO(5). Process tomography is used to analyze the effect of the pulse sequence. The pulse sequence was found to increase the decoherence time of the transition to over 30 seconds. Although the decoherence time was significantly increased, the population terms were found to rapidly decay on the application of the pulse sequence. The increase of this decay rate is attributed to inhomogeneity in the ensemble. Methods to circumvent this limit are discussed.

摘要

我们报告了动态退相干控制脉冲序列在Pr3+:Y(2)SiO(5)核四极跃迁上的应用。采用过程层析成像来分析脉冲序列的效果。发现该脉冲序列能将跃迁的退相干时间增加到30秒以上。尽管退相干时间显著增加，但发现施加脉冲序列时布居项会迅速衰减。这种衰减率的增加归因于系综中的不均匀性。文中讨论了规避这一限制的方法。