Comment on 'Full revivals in 2D quantum walks'

被引：0
|
作者：
Dodangodage, Randika [1 ]
Nanayakkara, Asiri [1 ]
机构：
[1] Natl Inst Fundamental Studies, Hanthana Rd, Kandy, Sri Lanka
来源：
PHYSICA SCRIPTA | 2018年 / 93卷 / 11期
关键词：
D O I：
10.1088/1402-4896/aae34b
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In the paper Stefanak et al (2010 Phys. Scr. T140 014035) have proved that for any four-state quantum walk, there cannot be cycles longer than two steps. Our investigations reveal that they have not used the most general form of characteristic polynomials in their proof. Consequently, the result is not generally valid and hence there can be quantum walks having cycles longer than two steps.
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