How to control a geometric quantum gate

• 来源期刊: 中国物理（英文版）
• 学科: 物理学
• 关键词: laser controlling mechanism geometric quantum gate two-level system
• 年，卷（期）: 2002,（2）
• 页码范围: 109-114
• 页数: 6页
• 分类号: O4
• 语种: 英文

摘要

In this paper, we detail the theoretical ideas which are used to explain the mechanism of the laser controlling thegeometric quantum gates introduced in the work by Ekert et al. (Ekert A, Ericsson M, Hayden P, Inanori H, Jones JA, Oi D K L and Vedral V 2000 J. Mod. Opt. 47 2501). We have introduced a two-level Hamiltonian system, anddirected to solve this system, and then obtained the probability distribution of this two-level system. We also show therelationships between the external laser fields and the transition of the qubit in the two-qubit controlled-phase gate,and how the transition of the qubit depends on the external laser fields and the states of the controlled qubit.