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Table of Content
20 October 2013 Volume 32 Issue 10
著者文摘
Construction of orthogonal basis of two - mode entangled coherent state and its entanglement measure
. 2013, 32(10): 1-1.
Abstract
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618
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346
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Entangled coherent states are a type of important continuous-variable entangled states in the processing of quantum information.However,it is complicated to calculate their entanglement due to the non-orthogonality of basis vectors in the representation of coherent state.We propose a construction method of a set of complete and orthogonal bases for two-mode entangled coherent states,and simplify the calculation of their entanglement.And also,the entanglement of several typical entangled states is calculated and discussed.
Polarization and photon spin density of light waves in an anisotropic medium
. 2013, 32(10): 5-5.
Abstract
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709
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(526KB) (
685
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The behavior of polarization and spin density of polarized light waves propagating inside an anisotropic medium is considered.Differing from the light in an isotropic medium,the polarization states and helicity eigenstates of the light waves will evolve in the anisotropic medium.The evolutional spin densities of both the circularly and the elliptically polarized light waves have been calculated,and the effects relevant to the polarization state evolution have been analyzed.An optical analog of Einstein-de Haas experimental scenario has been suggested in order to test the angular momentum transfer between light waves and anisotropic media.Such evolutional states of light would find potential applications in the field of quantum information.
The condition of treating with discrete system by using continuous model
. 2013, 32(10): 10-10.
Abstract
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738
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404
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The condition of treating with discrete system by using continuous model is investigated from swing of multi-section sticks.By the way,the interrelated conclusion about a linear monatomic chain is given by the use of comparability between systems.
Relativistic elastic collision between two particles
. 2013, 32(10): 15-15.
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1242
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928
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By taking relativistic effect into account,the elastic collision between two particles with equal rest mass,one of which is initially in the stationary state,is studied.It is shown that in the case of central collision,two particles will exchange their speeds after collision,which is the same as the result obtained based on the classical mechanics.However,for the case of non-central collision,the included angle between the speeds of two particles after collision is a sharp angle,which is different from the result obtained based on the classical mechanics.
The direct method for the multiples expansion of electromagnetic radiation field
. 2013, 32(10): 17-17.
Abstract
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1087
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914
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The multi-pole expansion theory of electromagnetic field is investigated by using the integral solution of electromagnetic field vector,which is related to the Helmholtz equation directly.With the help of Taylor series expansion,alternative calculation formula and method are given.
Capacitance of symmetrical arc - cylindrical capacitor
. 2013, 32(10): 21-21.
Abstract
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863
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(223KB) (
355
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The general model consisting of the symmetrical arc-cylindrical capacitor is a typically capacitor.The capacitance is solved for the capacitor of this type by using the conformal transformation method.The special cases are discussed and the relationship between capacitance and related parameters is mapped by Matlab.
A kind of method of solving two - dimensional electrostatic courtside value
. 2013, 32(10): 24-24.
Abstract
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950
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718
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By means of the plane mirror method combining with the conformal mapping method,two-dimensional boundary value problem with complex shape boundary is solved,the distribution of electric field is obtained,the electric field line and equipotential line maps are plotted by using mathematical software Matlab,as well as the correctness of the conclusion is verified.The application range of mirror image method for solving two-dimensional electrostatic field of boundary value problems with complex boundary shape is expanded,and a new way is provide for solving two-dimensional boundary value problem with complex shape boundary.
Discussion on contents of quantum physics of engineering course
. 2013, 32(10): 27-27.
Abstract
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622
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520
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The contents such as wave-particle dualism,quantizatio,eigenstate,superposed state and basic postulates in quantum physics textbok are discussed.Proposal for improving them is proposed.
Measurement of viscosity of liquid by using forced vibration of spring oscillator
. 2013, 32(10): 30-30.
Abstract
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754
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417
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An instrument for measuring the viscosity of a liquid is designed by using the forced vibration of a spring oscillator.A direct-current motor drives a steel ball to vibrate in the measured liquid.A Hall sensor is used to measure the vibration amplitudes and resonance frequencies of the steel ball.The viscosities of the castor oil and glycerol with the different temperatures are measured by the use of the instrument,respectively.The experimental results show that the relative errors between the measured values and theoretical values of the castor oil and glycerol under the temperatures from 23℃ to 29℃ are less than 3%.This measurement method has advantages of higher accuracy,no oil-pollution,obvious resonance,clear physical principle and good teaching effect.
The co - measurements of electrical and magnetic properties of colossal magnetoresistance materials
. 2013, 32(10): 35-35.
Abstract
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923
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522
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The electrical and magnetic properties of the perovskite La 2 /3 Ca 1 /3 MnO 3 are measured at the same time,in which colossal magnetoresistance and mechanism of double exchange are found.Transitions of insulator metal and paramagnetic-ferromagnetic are observed simultaneously,so interactions of electrical and magnetic in those materials are understood more easily.
Singular peak caused by the opening angle of emission horn in the microwave Bragg diffraction experiment
. 2013, 32(10): 38-38.
Abstract
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1024
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731
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In the microwave Bragg diffraction experiment,the reason why singular peak is caused by the opening angle of emission horn on simulation crystal（100） surface has been analyzed.Because microwave emitted by horn is not strictly plane wave,there exists a critical grazing angle when Bragg diffraction happens.When the grazing angle is less than the critical angle,receiving horn can not only received the crystal surface reflection wave,can also receive directly microwave emitted by horn,their coherence stack arises singular peak.The grazing angle corresponding to singular peak has been calculated,and it is consistent with the experimental data.
Quantum key distribution experiment in optical fiber based on the BB84 protocol
. 2013, 32(10): 41-41.
Abstract
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949
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(679KB) (
809
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Using an integrated equipment,we build a quantum key distribution experiment platform.Taking fiber at 850 nm as quantum channel,the platform uses attenuated polarization modulated single photons as information carriers,and combines with the general communications channel to randomly generate quantum key.This experimental is colosely intgrated the latest achievements of quatum information research and development,and the experimental design is innovative and prominent features,which isonductive to students to intuitiely understand quantum key distribution process in depth.
Applications and expansion of knowledge of optics in telescope development
. 2013, 32(10): 45-45.
Abstract
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926
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681
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In the process of interaction with disciplinary development and technical resources backgroud,telecopes have gone through 400 years of development.The interaction of astronomical telescope with the optics is in particular,prominent.By focusing on the development of the telescope,the key knowledge of optics is introduced.
Construction of atom optics curriculum for the undergraduate teaching
. 2013, 32(10): 51-51.
Abstract
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713
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291
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With the development of laser cooling and trapping atoms techniques,atom optics,a new filed in physics,has gradually come into being based on the researches on properties of the cold atoms,interaction between the cold atoms and matters,the manipulation of the cold atoms and their application.However,atom optics has not been systematically introduced to the undergraduates majoring in physics and the other involved sciences as an important part of the modern physics.In this paper,we first brief the development of atom optics and analyzed the necessity to construct this curriculum for undergraduates.Subsequently,the teaching contents of atom optics and the corresponding teaching plans are suggested and discussed according to the teaching requirements of colleges and universitses for undergraduates.
Investigation of thermal entanglement in a two - particles spin chain
. 2013, 32(10): 55-55.
Abstract
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875
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449
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The entanglement of two-particles Heisenberg XXZ chains with different Dzyaloshinskii-Moriya（DM） interaction is investigated.By means of negativity,the entanglement is calculated in detail as a function of the different parameter.We find that the entanglement will not be always enhanced by the increase of DM interaction.The critical temperature when entanglement disappeared varies with the different parameters J z and DM interaction.The entanglement as a function of magnetic field shows different properties for different x or z-component DM interaciton.Moreover,the entanglement can be controlled and enhanced by varying the distributions of the impurities,the strength of external magnetic field and the DM interaction.
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