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Room-temperature giant magnetotranstance effect in single-phase multiferroics

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Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 105-110页

作者： yan-Fen chang Young Sun Beijing National Laboratory for Condensed Matter Physics and Beijing Advanced Innovation Center for Materials Genome Engineering Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100190China Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China

Single-phase multiferroic materials are usually considered useless because of the weak magnetoelectric effects,low operating temperature,and small electric polarization induced by magnetic *** a result,current studies on applications of the magnetoelectric effects are mainly focusing on multiferroic heterostructures and *** we report a room-temperature giant effect in response to external magnetic fields in single-phase multiferroics.A low magnetic field of 1000 Oe applied on the spin-driven multiferroic hexaferrites BaSrCo_(2) Fe_(11)AlO_(22) and Ba_(0.9)Sr_(1.1)Co_(2) Fe_(11)AlO_(22)is able to cause a huge change in the linear magnetoelectric coefficient(α_(E)=dE/dH) by several orders,leading to a giant magnetotranstance(GMT) effect at room *** GMT effect is comparable to the well-known giant magnetoresistance(GMR) effect in magnetic multilayers,and thus opens up a door toward practical applications for single-phase multiferroics.

关键词： multiferroic magnetoelectric effect transtor

New Characterizations of Inhomogeneous Besovand Triebel-Lizorkin Spaces over Spaces of Homogeneous Type

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Acta Mathematica Sinica,English Series 2009年第11期25卷 1787-1804页

作者： yan chang HAN School of Mathematical Sciences South China Normal University Guangzhou 510631 P. R. China

In this paper we use the T1 theorem to prove a new characterization with minimum regularity and cancellation conditions for inhomogeneous Besov and Triebel-Lizorkin spaces over spaces of homogeneous type. These result... 详细信息

关键词： T1 theorem inhomogeneous Besov and Triebel-Lizorkin spaces discrete Calderon repro-ducing formula inhomogeneous Plancherel-Polya inequalities

Quantum secure direct communication and authentication protocol with single photons

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Chinese Science Bulletin 2013年第36期58卷 4571-4576页

作者： chang yan XU ChunXiang ZHANG ShiBin yan LiLi School of Computer Science and Engineering University of Electronic Science and Technology of China Department of Network Engineering Chengdu University of Information Technology

A quantum secure direct communication and authentication protocol is proposed by using single *** information transmission is completed by sending photons once in quantum channel,which improves the efficiency without losing the *** protocol encodes identity-string of the receiver as single photons sequence,which acts as detection sequence and implements *** secret message is encoded as single photons sequence,it is encrypted with identity-string of the sender by using XOR operation,which defends quantum teleportation attack *** base identity-strings of the sender and the receiver are reused unconditionally secure even in noisy *** with the protocol proposed by Wang et al.(Phys Lett A,2006,358:256–258),the protocol in this study sends photons once in one transmission and defends most attacks including‘man-in-the-middle’attack and quantum teleportation attack efficiently.

关键词：量子安全直接通信认证协议单光子信息发送量子隐形传态信息编码隐形传输无条件安全

Quantum Private Query Protocol Based on EPR Pairs

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Chinese Journal of Electronics 2018年第2期27卷 256-262页

作者： chang yan XIONG Jinxin GAO Xiang ZHANG Shibin yan Lili College of Information Security Engineering Chengdu University of Information Technology School of Computer Beijing University of Posts and Telecommunications

We propose a Quantum private query(QPQ) protocol based on device-independent Quantum key distribution(QKD) by using Einstein-Podolsky-Rosen(EPR) pairs. We analyze coherent attacks by a third party in a weaker constraints(non-signaling condition) compared with the formalism of quantum physics. We deduce the relationship between the raw key bits of Alice and the third party’s attack factor. Compared with existing QPQ protocols, our protocol is secure even when the source and measuring equipment used to distribute oblivious secret key can not be trusted. Quantum register is not needed in our protocol.

关键词： Quantum private query(QPQ) Coherent attack Einstein-Podolsky-Rosen(EPR) pairs Bell inequality

Robust EPR-pairs-based quantum secure communication with authentication resisting collective noise

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1907-1912页

作者： chang yan ZHANG ShiBin LI Jian yan LiLi Department of Network Engineering Chengdu University of Information Technology School of Computer Beijing University of Posts and Telecommunications

This work presents two robust quantum secure communication schemes with authentication based on Einstein-Podolsky-Rosen(EPR) pairs, which can withstand collective noises. Two users previously share an identity string representing their identities. The identity string is encoded as decoherence-free states(termed logical qubits), respectively, over the two collective noisy channels, which are used as decoy photons. By using the decoy photons, both the authentication of two users and the detection of eavesdropping were implemented. The use of logical qubits not only guaranteed the high fidelity of exchanged secret message, but also prevented the eavesdroppers to eavesdrop beneath a mask of noise.

关键词： quantum secure direct communication authentication fault tolerant collective noise

Maximum Cliques of Hypergraphs and Polynomial Optimization

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Acta Mathematicae Applicatae Sinica 2018年第4期34卷 842-855页

作者： yan-ming chang Yue-jian PENG College of Mathematics Hunan University Changsha 410082 China Institute of Mathematics Hunan University Changsha 410082 China

A remarkable connection between the clique number and the Lagrangian of a graph was established by Motzkin and Straus. Later, Rota Bul′o and Pelillo extended the theorem of Motzkin-Straus to r-uniform hypergraphs by studying the relation of local（global） minimizers of a homogeneous polynomial function of degree r and the maximal（maximum） cliques of an r-uniform hypergraph. In this paper, we study polynomial optimization problems for non-uniform hypergraphs with four different types of edges and apply it to get an upper bound of Tur′an densities of complete non-uniform hypergraphs.

关键词： hypergraph maximum clique polynomial optimization

The Fine Structures of Three Symmetric Latin Squares with Even Orders

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Acta Mathematica Sinica,English Series 2011年第6期27卷 1137-1148页

作者： Er Qiang FENG yan Xun chang Institute of Mathematics Beijing Jiaotong University Beijing 100044 P. R. China

Denote by SFin（v） the set of all integer pairs （t, s） for which there exist three symmetric Latin squares of order v on the same set having fine structure （t, s）. We completely determine the set SFin（2n） for a... 详细信息

关键词： Symmetric Latin square symmetric Latin trade fine structure

Quantum Risk Assessment Model Based on Two Three-Qubit GHZ States

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Computer Modeling in Engineering & Sciences 2020年第8期124卷 573-584页

作者： Tao Zheng yan chang Shibin Zhang School of Cyber Security Chengdu University of Information TechnologyChengdu610225China

With the acceleration of the construction of quantum communication networks,scholars have proposed different quantum communication protocols for different application ***,few scholars pay attention to the risk assessment process before *** this paper,we propose a novel quantum risk assessment model based on quantum teleportation technology with two three-qubit GHZ *** by using Bell states measurements(BSMs)and two-qubit projective measurements(PJMs),the communicators can recovery any arbitrary two-qubit *** protocol can transmit two-dimension risk assessment factors with better security *** the one hand,more sufficient evaluation factors allow the two communicating parties to more objectively evaluate the risk level of communication with the other party,and on the other hand,it also improves the qubit efficiency of the ***,we introduce the third party in this scheme can be semi-trusted,which must be full-trusted in our previous *** change can reduce the dependence of the communication parties on the third-party organization and improve the privacy of *** security analysis shows that this scheme can resist internal and external attacks,and the quantum circuit diagrams also prove that our protocol is physically easier to implement.

关键词： Quantum risk assessment model quantum communication two threequbit GHZ states quantum network

Maximum two-dimensional (u×v,4,1,3)-OOCs

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Applied Mathematics(A Journal of Chinese Universities) 2013年第3期28卷 279-289页

作者： HUANG Yue-mei chang yan-xun Institute of Mathematics Beijing Jiaotong University Mathematics Science college Inner Mongolia Normal University

Let Ф（u ×v, k, Aa, Ac） be the largest possible number of codewords among all two- dimensional （u ×v, k, λa, λc） optical orthogonal codes. A 2-D （u× v, k, λa, λ）-OOC with Ф（u× v, k, λa, λc） codewords is said to be maximum. In this paper, the number of codewords of a maximum 2-D （u × v, 4, 1, 3）-OOC has been determined.

关键词： maximum two-dimensional optical orthogonal code orbit.