在两个分离NV色心之间实现纠缠和量子态传递的有效方案.docVIP

在两个分离 NV 色心之间实现纠缠和量子态 传递的有效方案 李蓬勃 *，张剑 西安交通大学应用物理系，西安　 710049 摘要：提出了实现两个分离 NV center 之间纠缠态以及量子态传递的有效方案。这个方案利用 两个回音壁模式的球型介质微腔作为中介，而这两个球型介质微腔可以通过倏逝场或者光纤锥 波导耦合。我们从理论上推到出了制约此体系演化的有效哈密顿量，并证明了在一定条件下基 于此耦合体系可以实现两个 NV center 之间的纠缠态以及量子信息的传递。 关键词：量子光学；氮空穴色心；纠缠态；量子信息传递 中图分类号： O437 E?cient scheme for entangled state and quantum information transfer between two spatially separated nitrogen-vacancy centers Li Pengbo*, Zhang jian Department of Applied Physics, Xi’an Jiaotong University, Xi’an 710049 Abstract: An e?cient scheme is proposed to achieve entanglement and quantum information transfer between two separated nitrogen vacancy (NV) centers with two whispering-gallery-mode (WGM) microresonators, which are coupled either by the evanescent ?elds of the WGM or by an optical ?ber-taper waveguide. Owing to the excellent characteristics of the coupled system, an e?ective Hamiltonian is derived theoretically, with which the preparation of entangled state and exchange of information between the NV centers can be achieved under appropriate conditions. Key words: quantum optics; Entangled states; quantum information transfer; NV centers 0 Introduction Quantum entanglement is one of the most fascinating aspects of quantum theory. En- tangled states are now widely used for fundamental tests of quantum mechanics and play an 基金项目： Specialized Research Fund for the Doctoral Program of Higher Education (20110201120035) 作者简介： Correspondence author：Li Pengbo (1981-), male, associate professor, major research direction：quantum optics. -1- irreplaceable role in quantum information science, such as quantum cryptography [1], quan- tum computation [2, 3], quantum teleportation [4]. A large number of di?erent systems have been investigated to controllably prepare entangled states of matter and implement quantum information transfer, among which negatively charged NV centers in diamond have recently become a leading solid-state spin system for quantum information processing [5]. The compos- ite sys