在双模腔QED系统中用原子-腔共振相互作用实现三量子比特Toffoli门

J4 ›› 2009, Vol. 26 ›› Issue (5): 548-554.

在双模腔QED系统中用原子-腔共振相互作用实现三量子比特Toffoli门

唐世清^1,2 张登玉¹ 高峰¹ 谢利军^1,2 詹孝贵¹

1.衡阳师范学院物理与电子信息科学系湖南衡阳421008；
2. 湘潭大学材料与光电物理学院湖南湘潭411005

出版日期:2009-09-28 发布日期:2009-08-27
通讯作者: 张登玉（1962-），男，湖南祁阳人，衡阳师范学院物理与电子信息科学系教授，博士,硕导，主要研究方向是量子信息与量子光学。 E-mail:dyzhang672@sohu.com
作者简介:唐世清（1982-），男，湖南临武人，湘潭大学材料与光电物理学院硕士研究生，主要研究方向是量子信息与量子光学。E-mail address: tangshiqinghn@163.com
基金资助:
Natural Science Foundation of Hunan province ( 06JJ50118)

A scheme for implementing a three-qubit Toffoli gate with resonant interaction in bimodal cavity QED system

TANG Shi-Qing^1,2, ZHANG Den-Yu¹, GAO Feng¹, XIE Li-Jun^1,2, ZHAN Xiao-Gui¹

1.Department of physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
2. Faculty of Material and Photoelectronic physics, Xiangtan University, Xiangtan 411005,China

Published:2009-09-28 Online:2009-08-27
Supported by:
Natural Science Foundation of Hunan province ( 06JJ50118)

摘要/Abstract

摘要：

提出了一种在腔QED系统中用一个五能级原子通过原子-腔共振相互作用实现三量子比特Toffoli 门的方案。在提出的方案当中，两个量子化的腔模充当控制比特，而原子的两个低能态构成目标比特。数值结果表明，当同时考虑原子高能态的自发辐射和腔模的衰减对量子门的保真度的影响时，腔场的衰减是主要的噪声来源。讨论了原子-光场耦合常数的偏差对三量子比特Toffoli 门保真度的影响以及方案在实验上的可行性。

关键词: 量子信息, 三量子比特Toffoli 门, 腔QED, 保真度

Abstract:

A scheme is proposed for realization of three-qubit Toffoli gate for two intracavity modes with a five-level atom through the atom–cavity resonant interaction in a cavity quantum electrodynamics system. In the presented protocol, the two quantized cavity-field modes act as the two controlling qubits and the two stable ground states of the atom form the target qubit. The numerical simulation shows that the cavity-fields decay is the dominant noise source in the dissipative process when both the atomic spontaneous emission and the decay of the cavity modes are taken into account during the gate operation. The influence of the deviation of the coupling strength on fidelity of the three-qubit Toffoli gate and the experimental feasibility of our proposal are also discussed.

Key words: quantum information, three-qubit Toffoli gate, cavity QED, fidelity

唐世清张登玉高峰谢利军詹孝贵. 在双模腔QED系统中用原子-腔共振相互作用实现三量子比特Toffoli门[J]. J4, 2009, 26(5): 548-554.

TANG Shi-Qing, ZHANG Den-Yu, GAO Feng, XIE Li-Jun, ZHAN Xiao-Gui. A scheme for implementing a three-qubit Toffoli gate with resonant interaction in bimodal cavity QED system[J]. J4, 2009, 26(5): 548-554.

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