In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the ...In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the unknown twoparticle entangled state can be teleported perfectly. The successful probabilities and fidelities of the schemes can reach unity.展开更多
针对越来越多的研究利用由广域测量系统(wide area measurement system,WAMS)和监控及数据采集系统(supervisory control and data acquisition,SCADA)组成的混合测量来改善传统状态估计的情况,在分析WAMS/SCADA混合测量数据兼容性的基...针对越来越多的研究利用由广域测量系统(wide area measurement system,WAMS)和监控及数据采集系统(supervisory control and data acquisition,SCADA)组成的混合测量来改善传统状态估计的情况,在分析WAMS/SCADA混合测量数据兼容性的基础上,提出一种可行的兼容方案解决混合测量的数据兼容问题。研究从WAMS和SCADA的数据差异入手,建立混合测量模型,分析得出2种数据的时间同步性和测量权值为影响混合测量数据兼容的主要因素,进而提出兼容方案,实现WAMS和SCADA数据的同步,并重新量化测量权值。在标准测试系统上的仿真验证了关于WAMS/SCADA混合测量状态估计数据兼容性分析的正确性和兼容方案的有效性。展开更多
A scheme that probabilistically realizes hierarchical quantum state sharing of an arbitrary unknown qubit state with a four-qubit non-maximally entangled |χ state is presented in this paper. In the scheme, the sender...A scheme that probabilistically realizes hierarchical quantum state sharing of an arbitrary unknown qubit state with a four-qubit non-maximally entangled |χ state is presented in this paper. In the scheme, the sender Alice distributes a quantum secret with a Bell-state measurement and publishes her measurement outcomes via a classical channel to three agents who are divided into two grades. One agent is in the upper grade, while the other two agents are in the lower grade. Then by introducing an ancillary qubit, the agent of the upper grade only needs the assistance of any one of the other two agents for probabilistically obtaining the secret, while an agent of the lower grade needs the help of both the other two agents by using a controlled-NOT operation and a proper positive operator-valued measurement instead of the usual projective measurement. In other words, the agents of two different grades have different authorities to reconstruct Alice's secret in a probabilistic manner. The scheme can also be modified to implement the threshold-controlled teleportation.展开更多
基金The project supported by the National Natural Science Foundation of China under Grant No. 60678022, the Key Program of the Education Department of Anhui Province under Grant Nos. 2006KJ070A, 2006KJ057B and the Talent Foundation of Anhui University
文摘In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the unknown twoparticle entangled state can be teleported perfectly. The successful probabilities and fidelities of the schemes can reach unity.
文摘针对越来越多的研究利用由广域测量系统(wide area measurement system,WAMS)和监控及数据采集系统(supervisory control and data acquisition,SCADA)组成的混合测量来改善传统状态估计的情况,在分析WAMS/SCADA混合测量数据兼容性的基础上,提出一种可行的兼容方案解决混合测量的数据兼容问题。研究从WAMS和SCADA的数据差异入手,建立混合测量模型,分析得出2种数据的时间同步性和测量权值为影响混合测量数据兼容的主要因素,进而提出兼容方案,实现WAMS和SCADA数据的同步,并重新量化测量权值。在标准测试系统上的仿真验证了关于WAMS/SCADA混合测量状态估计数据兼容性分析的正确性和兼容方案的有效性。
基金Project supported by the National Natural Science Foundation of China （Grant No. 11071178） and the Research Foundation of the Education Department of Sichuan Province, China （Grant No. 12ZB106）.
文摘A scheme that probabilistically realizes hierarchical quantum state sharing of an arbitrary unknown qubit state with a four-qubit non-maximally entangled |χ state is presented in this paper. In the scheme, the sender Alice distributes a quantum secret with a Bell-state measurement and publishes her measurement outcomes via a classical channel to three agents who are divided into two grades. One agent is in the upper grade, while the other two agents are in the lower grade. Then by introducing an ancillary qubit, the agent of the upper grade only needs the assistance of any one of the other two agents for probabilistically obtaining the secret, while an agent of the lower grade needs the help of both the other two agents by using a controlled-NOT operation and a proper positive operator-valued measurement instead of the usual projective measurement. In other words, the agents of two different grades have different authorities to reconstruct Alice's secret in a probabilistic manner. The scheme can also be modified to implement the threshold-controlled teleportation.
