An index theorem for one-dimensional gapless non-unitary quantum walks
An index theorem for one-dimensional gapless non-unitary quantum walks
复制标题
一维无间隙非酉量子行走的指数定理
DOI:
10.1007/s11128-021-03212-y
复制
发表时间:
2021
影响因子:
2.5
通讯作者:
Tanaka Yohei
中科院分区:
文献类型:
--
作者:
Asahara Keisuke;Funakawa Daiju;Seki Motoki;Tanaka Yohei
Recent developments in the index theory of discrete-time quantum walks allow us to assign a certain well-defined supersymmetric index to a unitary time evolutionUand a-grading operatorsatisfying the chiral symmetry condition,In the present article, we extend this index theory to encompass non-unitary time evolutionsU. The existing literature for unitaryUassumes thatUis essentially gapped to define the associated index, that is, the essential spectrum ofUcontains neithernor. We show this assumption is not necessary ifUfails to be unitary. As a concrete example, we consider the well-known non-unitary quantum walk model on the integer latticeintroduced by Mochizuki–Kim–Obuse.
登录
查看更多内容
影响因子:
1.8
作者:
D. Sambou;R. T. Aldecoa
通讯作者:
R. T. Aldecoa
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
A. Arai
通讯作者:
A. Arai
影响因子:
6.4
作者:
Cedzich, C.;Geib, T.;Werner, R. F.
通讯作者:
Werner, R. F.
影响因子:
2.5
作者:
Suzuki Akito;Tanaka Yohei
通讯作者:
Tanaka Yohei
影响因子:
2.5
作者:
Suzuki Akito;Tanaka Yohei;Suzuki Akito
通讯作者:
Suzuki Akito