Symmetry-protected adiabatic quantum transistors

被引：10

作者：

Williamson, Dominic J. ^{[1
,2
]}

Bartlett, Stephen D. ^{[1
]}

机构：

[1] Univ Sydney, Sch Phys, Ctr Engn Quantum Syst, Sydney, NSW 2006, Australia

[2] Univ Vienna, Fac Phys, Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria

来源：

NEW JOURNAL OF PHYSICS | 2015年 / 17卷

基金：

奥地利科学基金会;

关键词：

quantum computing; entanglement; topological order; DECOHERENCE-FREE SUBSPACES; COMPUTATION;

D O I：

10.1088/1367-2630/17/5/053019

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Adiabatic quantum transistors (AQT) allow quantum logic gates to be performed by applying a large field to a quantum many-body system prepared in its ground state, without the need for local control. The basic operation of such a device can be viewed as driving a spin chain from a symmetry-protected (SP) phase to a trivial phase. This perspective offers an avenue to generalize theAQTand to design several improvements. The performance of quantum logic gates is shown to depend only on universal symmetry properties of a SP phase rather than any fine tuning of the Hamiltonian, and it is possible to implement a universal set of logic gates in this way by combining several different types of SP matter. Such SP AQTs are argued to be robust to a range of relevant noise processes.

引用

页数：24