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One-Way Information Deficit and Geometry for a Class of Two-Qubit States

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Communications in Theoretical Physics 2013年第5期59卷 540-546页

作者：王耀坤马腾李波王志玺 School of Mathematical Sciences Capital Normal University College of Mathematics Tonghua Normal University Institute of Physics Chinese Academy of Sciences Department of Mathematics and Computer Shangrao Normal University

The work deficit, as introduced by Jonathan Oppenheim et al. [Phys. Rev. Left. 89 （2002） 180402] is a good measure of the quantum correlations in a state and provides a new standpoint for understanding quantum non-locality. In this paper, we analytically evaluate the one-way information deficit （OWID） for the Bell-diagonai states and a class of two-qubit states and further give the geometry picture for OWID. The dynamic behavior of the OWID under decoherence channel is investigated and it is shown that the OWID of some classes of X states is more robust against the decoherence than the entanglement.

关键词： quantum discord one-way information deficit Bell-diagonal entropy

Optimal time-decay rates of the Boltzmann equation

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Science China Mathematics 2014年第4期57卷 807-822页

作者： ZHONG MingYing Department of Mathematics and Information Sciences Guangxi University

We consider the optimal time-convergence rates of the global solution to the Cauchy problem for the Boltzmann equation in *** show that the global solution tends to the global Maxwellian at the optimal time-decay rate(1+t)-3/4,where the macroscopic density,momentum and energy decay at the optimal rate(1+t)-3/4 and the microscopic part decays at the optimal rate(1+t)-5/*** also show that the solution tends to the Maxwellian at the optimal time-decay rate(1+t).5/4 in the case of the macroscopic part of the initial data is zero,where the macroscopic density,momentum and energy decay at the optimal rate(1+t)-5/4 and the microscopic part decays at the optimal rate(1+t)-7/*** convergence rates are shown to be optimal for the Boltzmann equation.

关键词： Boltzmann equation optimal time decay rate

Three-Tangle for High-Rank Mixed States

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Communications in Theoretical Physics 2011年第2期55卷 251-256页

作者：何淑娟王晓红费少明孙洪祥温巧燕 State key Laboratory of Networking and Switching Technology Beijing University of Post and Telecommunication Department of Mathematics Capital Normal University School of Science Beijing University of Post and Telecommunication

A family of rank-n （n = 5, 6, 7, 8） three-qubit mixed states are constructed. The explicit expressions for the three-tangle and optimal decompositions for all these states are given. The CKW relations for these stat... 详细信息

关键词： three-tangle optimal decomposition

Multiway Dynamic Trust Chain Model on Virtual Machine for Cloud Computing

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China Communications 2016年第7期13卷 83-91页

作者： Jie Zhu Guoyuan Lin Fucheng You Huaqun Liu Chunru Zhou School of Computer Science and Technology China University of Mining&TechnologyXuzhou 221116China State key Laboratory for Novel Software Technology hosted at Nanjing University Nanjing 210093China Information Engineering School of beijing Institute of Graphic Communication Beijing 102600China beijing key Laboratory of Signal and Information Processing for High-end Printing Equipment Beijing Institute of Graphic CommunicationBeijing 100026China Information Security Center Beijing University of Posts and TelecommunicationsBeijing 100876China Nanjing University of Information Science&Technology Nanjing 210044China

This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the *** secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine *** dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown.

关键词： cloud computing virtual machine trustworthiness measurement dynamic trust transfer