QQ客服 官方微博 反馈留言

	Decoherence and relevant universality in quantum algorithms via a dynamic theory for quantum measurement
	Sun, CP ; Zhan, H ; Liu, XF
	1998
关键词	WAVE-FUNCTION COLLAPSE ERROR-CORRECTING CODES DISSIPATIVE SYSTEM COMPUTERS COMPUTATION REALIZATION COHERENCE EVOLUTION MODEL LOGIC
英文摘要	It is well known that environment may decohere a quantum bit (qubit) system immersed in it, making a quantum computation invalid. But the quantitative features of the decoherence seem to depend on both the constitution of the environment and the details of its coupling with the qubit system. In this paper, based on the dynamic approach for quantum measurement developed from the Hepp-Coleman model [K. Hepp, Helv. Phys. Acta 45, 237 (1972)], we generally model the environment as a collection of a large number of subsystems and then consider to what extent and in which way the environment and its coupling with the qubit system may affect a quantum computation process. In the weak-coupling limit, we find that as far as decoherence time is concerned, there is no essential difference between an environment of two-level subsystems and an environment of harmonic oscillators. This implies that there exists some universality independent of specific constitutions of environments. However, it is also shown that this is not true at finite temperature or in the case of strong coupling. So only if the coupling is weak and the temperature low does there exist the possibility of developing a universal scheme of controlling a qubit system such that the decoherence is avoided. The possible effect of environment on the efficiency of a quantum algorithm is also explicitly illustrated through the example of Shor's prime factorization algorithm.; Optics; Physics, Atomic, Molecular & Chemical; SCI(E); 41; ARTICLE; 3; 1810-1821; 58
语种	英语
出处	SCI
出版者	physical review a
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/401616]
专题	数学科学学院
推荐引用方式 GB/T 7714	Sun, CP,Zhan, H,Liu, XF. Decoherence and relevant universality in quantum algorithms via a dynamic theory for quantum measurement. 1998-01-01.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。