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国家自然科学基金(08XLY03)

作品数:4 被引量:11H指数:2
相关作者:狄尧民刘思平刘冬冬更多>>
相关机构:徐州师范大学徐州工程学院襄樊学院更多>>
发文基金:国家自然科学基金江苏省高校自然科学研究项目湖北省教育厅科学技术研究项目更多>>
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Entanglement for a two-parameter class of states in a high-dimension bipartite quantum system被引量:7
2010年
The entanglement for a two-parameter class of states in a high-dimension (m n,n≥m≥3) bipartite quantum system is discussed.The negativity (N) and the relative entropy of entanglement (Er) are calculated,and the analytic expressions are obtained.Finally the relation between the negativity and the relative entropy of entanglement is discussed.The result demonstrates that all PPT states of the two-parameter class of states are separable,and all entangled states are NPT states.Different from the 2 ? n quantum system,the negativity for a two-parameter class of states in high dimension is not always greater than or equal to the relative entropy of entanglement.The more general relation expression is mN/2≥Er.
DI YaoMinLIU SiPingLIU DongDong
关键词:NEGATIVITY
Synthesis of some three-qubit gates and their implementation in a three spins system coupled with Ising interaction被引量:4
2010年
The synthesis of the Toffoli gate, Fredkin gate, three-qubit Inversion-on-equality gate and D(α) gate, as well as their implementation in a three spins system coupled with Ising interaction are investigated. The sequences of the control pulse and the drift process to implement these gates are given. It is revealed that the implementation of some three-qubit gates in a circular spin chain is much better than in a linear spin chain, and every two measurements of the quantum computation complexity are not always consistent. It is significant to directly study the implementation of the multi-qubit gates and even more complicated components of quantum information processing without resorting to their synthesis.
WEI HaiRui, DI YaoMin & WANG Yan School of Physics & Electronic Engineering, Xuzhou Normal University, Xuzhou 221116, China
关键词:THREESPINSSYSTEMISINGINTERACTION
Controllability of spin 1 systems and realization of ternary SWAP gate in two spin 1 systems coupled with Ising interaction
2010年
In this paper,we investigate the controllability of spin 1 systems and the realization of ternary gates.Using dipole and quadrupole operators as the orthogonal basis of su(3) algebra,we discuss the controllability of one spin 1 systems and offer the concept of a complete set of control operators first.Then we present the controllability of two spin 1 systems coupled with Ising interaction and the transforming relations of the drift process of the system.Finally the specific realization of the ternary SWAP gate in these systems is discussed.It takes 9 drift processes and 25 basic control processes.
WANG YanDI YaoMinWEI HaiRui
关键词:CONTROLLABILITY
一类高维两体二参量态的量子纠缠特性
2010年
讨论了两体高维(mn,m≥3)量子系统一类两参量态的量子纠缠特性.计算了它们的负值度N(negativity)和量子相对熵纠缠度Er,得到了解析表达式.最后讨论这二种纠缠度之间的关系.分析表明这一类两参量态的PPT态都是可分离态,所有纠缠态都是NPT态.与2?n量子系统不同,高维情形不再有负值度总是大于等于量子相对熵纠缠度的简单关系,更一般的关系式为mN/2≥Er.
狄尧民刘思平刘冬冬
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