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Separability criteria based on Heisenberg–Weyl representation of density matrices
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作者 Jingmei Changl Meiyu Cui +1 位作者 tinggui zhang Shao-Ming Fei 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第3期132-136,共5页
Separability is an important problem in theory of quantum entanglement. By using the Bloch representation of quantum states in terms of the Heisenberg-Weyl observable basis, we present a new separability criterion for... Separability is an important problem in theory of quantum entanglement. By using the Bloch representation of quantum states in terms of the Heisenberg-Weyl observable basis, we present a new separability criterion for bipartite quantum systems. It is shown that this criterion can be better than the previous ones in detecting entanglement. The results are generalized to multipartite quantum states. 展开更多
关键词 Heisenberg-Weyl observable basis Bloch representation separability criterion multipartite quan- tuna states
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Quantum legitimacy of reversible gate and a new design of multiplier based on R gate
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作者 Tingyu Ge tinggui zhang Xiaofen Huang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第5期101-106,共6页
Quantum full adders play a key role in the design of quantum computers.The efficiency of a quantum adder directly determines the speed of the quantum computer,and its complexity is closely related to the difficulty an... Quantum full adders play a key role in the design of quantum computers.The efficiency of a quantum adder directly determines the speed of the quantum computer,and its complexity is closely related to the difficulty and the cost of building a quantum computer.The existed full adder based on R gate is a great design but it is not suitable to construct a quantum multiplier.We show the quantum legitimacy of some common reversible gates,then use R gate to propose a new design of a quantum full adder.We utilize the new designed quantum full adder to optimize the quantum multiplier which is based on R gate.It is shown that the new designed one can be optimized by a local optimization rule so that it will have lower quantum cost than before. 展开更多
关键词 reversible gate quantum full adder quantum multiplier
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Sharing quantum nonlocality in star network scenarios 被引量:1
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作者 tinggui zhang Naihuan Jing Shao-Ming Fei 《Frontiers of physics》 SCIE CSCD 2023年第3期193-201,共9页
The Bell nonlocality is closely related to the foundations of quantum physics and has significant applications to security questions in quantum key distributions.In recent years,the sharing ability of the Bell nonloca... The Bell nonlocality is closely related to the foundations of quantum physics and has significant applications to security questions in quantum key distributions.In recent years,the sharing ability of the Bell nonlocality has been extensively studied.The nonlocality of quantum network states is more complex.We first discuss the sharing ability of the simplest bilocality under unilateral or bilateral POVM measurements,and show that the nonlocality sharing ability of network quantum states under unilateral measurements is similar to the Bell nonlocality sharing ability,but different under bilateral measurements.For the star network scenarios,we present for the first time comprehensive results on the nonlocality sharing properties of quantum network states,for which the quantum nonlocality of the network quantum states has a stronger sharing ability than the Bell nonlocality. 展开更多
关键词 Bell nonlocality quantum network nonlocality sharing POVM measurements
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von Neumann measurement-related matrices and the nullity condition for quantum correlation
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作者 MingJing Zhao Teng Ma +1 位作者 tinggui zhang Shao-Ming Fei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第12期27-32,共6页
We study von Neumann measurement-related matrices, and the nullity condition of quantum correlation. We investigate the properties of these matrices that are related to a von Neumann measurement. It is shown that thes... We study von Neumann measurement-related matrices, and the nullity condition of quantum correlation. We investigate the properties of these matrices that are related to a von Neumann measurement. It is shown that these(m^2-1)×(m^2-1) matrices are idempotent, and have rank m-1. These properties give rise to necessary conditions for the nullity of quantum correlations in bipartite systems. Finally, as an example we discuss quantum correlation in Bell diagonal states. 展开更多
关键词 von Neumann measurement matrix RANK quantum correlation
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Uncertainty relations based on Wigner-Yanase skew information
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作者 Xiaofen Huang tinggui zhang Naihuan Jing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2020年第7期30-35,共6页
In this paper,we use certain norm inequalities to obtain new uncertain relations based on the Wigner-Yanase skew information.First for an arbitrary finite number of observables we derive an uncertainty relation outper... In this paper,we use certain norm inequalities to obtain new uncertain relations based on the Wigner-Yanase skew information.First for an arbitrary finite number of observables we derive an uncertainty relation outperforming previous lower bounds.We then propose new weighted uncertainty relations for two noncompatible observables.Two separable criteria via skew information are also obtained. 展开更多
关键词 uncertainty relations skew information ENTANGLEMENT
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