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A Measure of Non-Classicality of Even and Odd Coherent States

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Chinese Physics Letters 2008年第4期25卷 1175-1178页

作者：叶永华李志坚曾高坚 Department of Physics Xiangnan University Chenzhou 423000 physical and electronic Department Hunan First Normal College Changsha 410002 information Science college Hunan Normal University Changsha 410081

A measure of non-classicality of even and odd coherent states is studied. We first calculate the Wigner functions of the even and odd coherent states, which consists of two terms： the positive-definite Gaussian term and the wave term with negativity, and then calculate the integrated value εmax of the wave term of the Wigner functions of the even and odd coherent states in their area with negativity, and use εmax to measure non-classicality of the even and odd coherent states. For the even and odd coherent states with certain photon count, it is very convenient for us to use εmax to measure their non-classicality. The methods of our definition and calculation for εmax have theoretical reference value.

关键词： WIGNER FUNCTION N-COMPONENTS SUPERPOSITION DECOHERENCE

Circular Semi-Quantum Secret Sharing Using Single Particles

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Communications in Theoretical Physics 2018年第12期69卷 661-671页

作者： Chong-Qiang Ye Tian-Yu Ye college of information & electronic Engineering Zhejiang Gongshang University

Semi-quantum secret sharing(SQSS) is an important branch of semi-quantum cryptography, and differs from quantum secret sharing(QSS) in that not all parties are required to possess quantum capabilities. All previous SQSS protocols have three common features:(i) they adopt product states or entangled states as initial quantum resource;(ii)the particles prepared by quantum party are transmitted in a tree-type way; and(iii) they require the classical parties to possess the measurement capability. In this paper, two circular SQSS protocols with single particles are suggested,where the first one requires the classical parties to possess the measurement capability while the second one does not have this requirement. Compared with the previous SQSS protocols, the proposed SQSS protocols have some distinct features:(i) they adopt single particles rather than product states or entangled states as initial quantum resource;(ii)the particles prepared by quantum party are transmitted in a circular way; and(iii) the second protocol releases the classical parties from the measurement capability. The proposed SQSS protocols are robust against some famous attacks from an eavesdropper, such as the measure-resend attack, the intercept-resend attack and the entangle-measure attack,and are feasible with present quantum technologies in reality.

关键词： semi-quantum cryptography semi-quantum secret sharing single particles circular transmission measurement capability

Multi-Party Quantum Private Comparison Protocol Based on Entanglement Swapping of Bell Entangled States

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Communications in Theoretical Physics 2016年第9期65卷 280-290页

作者：叶天语 college of information and electronic Engineering Zhejiang Gongshang University

Recently, Liu et al. proposed a two-party quantum private comparison(QPC) protocol using entanglement swapping of Bell entangled state(Commun. Theor. Phys. 57(2012) 583). Subsequently, Liu et al. pointed out that in Liu et al.'s protocol, the TP can extract the two users' secret inputs without being detected by launching the Bell-basis measurement attack, and suggested the corresponding improvement to mend this loophole(Commun. Theor. Phys. 62(2014) 210). In this paper, we first point out the information leakage problem toward TP existing in both of the above two protocols, and then suggest the corresponding improvement by using the one-way hash function to encrypt the two users' secret inputs. We further put forward the three-party QPC protocol also based on entanglement swapping of Bell entangled state, and then validate its output correctness and its security in detail. Finally, we generalize the three-party QPC protocol into the multi-party case, which can accomplish arbitrary pair's comparison of equality among K users within one execution.

关键词： multi-party quantum private comparison Bell entangled state entanglement swapping information leakage

Effect of Topology Structures on Synchronization Transition in Coupled Neuron Cells System

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Communications in Theoretical Physics 2013年第9期60卷 380-386页

作者：梁立嗣张季谦许贵霞刘乐柱黄守芳 college of Physics and electronic information Anhui Normal University

In this paper, by the help of evolutionary algorithm and using Hindmarsh-Rose （HR） neuron model, we investigate the effect of topology structures on synchronization transition between different states in coupled neuron cells system. First, we build different coupling structure with N cells, and found the effect of synchronized transition contact not only closely with the topology of the system, but also with whether there exist the ring structures in the system. In particular, both the size and the number of rings have greater effects on such transition behavior. Secondly, we introduce synchronization error to qualitative analyze the effect of the topology structure. Phrthermore, by fitting the simulation results, we find that with the increment of the neurons number, there always exist the optimization structures which have the minimum number of connecting edges in the coupling systems. Above results show that the topology structures have a very crucial role on synchronization transition in coupled neuron system. Biological system may gradually acquire such efficient topology structures through the long-term evolution, thus the systems＇ information process may be optimized by this scheme.

关键词： neuron network topology configuration synchronization transition

A method for generating double-ring-shaped vector beams

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Chinese Physics B 2016年第7期25卷 220-224页

作者：陈欢凌晓辉陈知红李钱光吕昊余华清易煦农 college of Physics and electronic information Engineering Hubei Engineering University Department of Physics and electronic information Science Hengyang Normal University

We propose a method for generating double-ring-shaped vector beams. A step phase introduced by a spatial light modulator（SLM） first makes the incident laser beam have a nodal cycle. This phase is dynamic in nature because it depends on the optical length. Then a Pancharatnam–Berry phase（PBP） optical element is used to manipulate the local polarization of the optical field by modulating the geometric phase. The experimental results show that this scheme can effectively create double-ring-shaped vector beams. It provides much greater flexibility to manipulate the phase and polarization by simultaneously modulating the dynamic and the geometric phases.

关键词： vector beam Pancharatnam–Berry phase element geometric phase

EFFECTS OF SECONDARY STRUCTURE ON ELASTIC BEHAVIOR OF PROTEIN-LIKE CHAINS

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Chinese Journal of Polymer Science 2009年第2期27卷 253-265页

作者：孙婷婷 college of information and electronic Engineering Zhejiang Gongshang University

The elastic behavior of protein-like chains was investigated by using the Pruned-Enriched-Rosenbluth Method （PERM）.Three typical protein-like chains such as all-α,all-β,andα+β（αβ） proteins were studied in our modified orientation dependent monomer-monomer interaction （ODI） *** calculated the ratio of〈R;〉/N and shape factor〈δ;〉of protein-like chains in the process of *** the meantime,we discussed the average energy per bond〈U〉/N, average contact energy per bond〈U〉;/N,average helical energy per bond〈U〉;/N and average sheet energy per bond〈U〉;/*** maps of contact formation,α-helix formation,β-sheet formation were *** the results educe a view that the helix structure is the most stable structure,while the other two structures are easy to be ***,the average Helmholtz free energy per bond〈A〉/Nis was *** force f obtained from the free energy was also *** was shown that the chain extended itself spontaneously *** force was studied in the process of elongation. Lastly,the energy contribution to elastic force f;was calculated *** was noted that fu for all-fl chains increased first,and then decreased with x;increasing.

关键词： Protein-like chain Elastic behavior Secondary structure PERM.

Improving Recording Density of All-Optical Magnetic Storage by Using High-Pass Angular Spectrum Filters

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Chinese Physics Letters 2009年第10期26卷 209-211页

作者：庄友谊张耀举 college of Physics and electronic information Wenzhou University Wenzhou 325035

A new design is presented to improve the magnetic recording density in all-optical magnetic storage. By using the high numerical lens with a high-pass angular spectrum filter, circularly polarized laser pulses are focused into the magneto-optic film with the perpendicular anisotropy. Magnetization of the film is induced by the inverse Faraday effect. As the obstructed angle of the filter increases the magnetic recording density increases evidently. The magnetization intensity and the sidelobe effect are also discussed.

关键词： sea surface nonliear interaction numerical method

Fault-Tolerant Quantum Dialogue Without information Leakage Based on Entanglement Swapping between Two Logical Bell States

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Communications in Theoretical Physics 2015年第4期63卷 431-438页

作者：叶天语 college of information & electronic Engineering Zhejiang Gongshang University

At present, the anti-noise property and the information leakage resistant property are two great concerns for quantum dialogue(QD). In this paper, two anti-noise QD protocols without information leakage are presented by using the entanglement swapping technology for two logical Bell states. One works well over a collective-dephasing noise channel, while the other takes effect over a collective-rotation noise channel. The negative influence of noise is erased by using logical Bell states as the traveling quantum states. The problem of information leakage is avoided by swapping entanglement between two logical Bell states. In addition, only Bell state measurements are used for decoding, rather than four-qubit joint measurements.

关键词： quantum dialogue(QD) information leakage entanglement swapping logical Bell state collective-dephasing noise collective-rotation

The effect of array periodicity on the filtering characteristics of metal/dielectric photonic crystals

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Journal of Semiconductors 2011年第4期32卷 66-69页

作者：肖功利杨宏艳 information & Communications college Guilin University of Electronic Technology Computer Science & Engineering college Guilin University of Electronic Technology

We present a both theoretical and experimental investigation into the effect of array periodicity on the filtering characteristics of metal/dielectric photonic crystals（MDPhCs） with hexagonal arrays of subwavelength holes in gold/silicon dioxide films,varying the array periodicity from 6 to 8μm every 1μm while the ratio of hole radius to array periodicity is kept constant（1/4）.The results indicate that the reflectance spectrum is highly dependent on the array *** the array periodicity increases,the reflectance spectrum exhibits a large redshift *** finite difference time domain（FDTD） simulations agree well with the experimental results. By analyzing the relationship between the position of the reflectance minimum and the array periodicity,we find that the filtering characteristics of MDPhCs have an almost linear relationship with the array periodicity under the conditions of keeping the same ratio of hole radius to array periodicity（1/4）.This finding provides an effective way to control the filtering characteristics of MDPhCs,which have potential applications in optical filters,plasmonic thermal emitters and so on.

关键词： optics at surfaces surface plasmon polaritons array periodicity FDTD method metal/dielectric photonic crystal filtering characteristic