We use linear entropy of an exact quantum state to study the entanglement between internal electronic states and external motional states for a two-level atom held in an amplitude-modulated and tilted optical lattice....We use linear entropy of an exact quantum state to study the entanglement between internal electronic states and external motional states for a two-level atom held in an amplitude-modulated and tilted optical lattice. Starting from an unentangled initial state associated with the regular ＇island＇ of classical phase space, it is demonstrated that the quantum resonance leads to entanglement generation, the chaotic parameter region results in the increase of the generation speed, and the symmetries of the initial probability distribution determine the final degree of entanglement. The entangled initial states are associated with the classical ＇chaotic sea＇, which do not affect the final entanglement degree for the same initial symmetry. The results may be useful in engineering quantum dynamics for quantum information processing.展开更多
Classical molecular dynamics simulation has been widely used to study the rapid cooling process of preparing amorphous alloys.However,the simulated cooling rate is several orders of magnitude higher than the experimen...Classical molecular dynamics simulation has been widely used to study the rapid cooling process of preparing amorphous alloys.However,the simulated cooling rate is several orders of magnitude higher than the experimental cooling rate.In this paper,Zr_(55)Cu_(35)Al_(10)alloy was taken as an example.It is found that adding isothermal annealing at a temperature slightly lower than Tand prolonging isothermal annealing time could effectively reduce the cooling rate.The glassy sample prepared in this way demonstrates significant energetic stability and well-developed short-range and medium-range order.展开更多
We have studied the dynamics and transfer of the entanglement of the two identical atoms simultaneously interacting with vacuum field by employing the dressed-state representation. The two atoms are driven by classica...We have studied the dynamics and transfer of the entanglement of the two identical atoms simultaneously interacting with vacuum field by employing the dressed-state representation. The two atoms are driven by classical fields. The influence of the initial entanglement degree of two atoms, the coupling strength between the atom and the classical field and the detuning between the atomic transition frequency and the frequency of classical field on the entanglement and atomic linear entropy is discussed. The initial entanglement of the two atoms can be transferred into the entanglement between the atom and cavity field when the dissipation is neglected. The maximally entangled state between the atoms and cavity field can be obtained under some certain conditions. The time of disentanglement of two atoms can be controlled and manipulated by adjusting the detuning and classical driving fields. Moreover, the larger the cavity decay rate is, the more quickly the entanglement of the two atoms decays.展开更多
Presents a study which proposed an iterative approach to solve systems of linear equations. Definition of two families of convergent iterative methods; Features of the iterative method; Application of the method to a ...Presents a study which proposed an iterative approach to solve systems of linear equations. Definition of two families of convergent iterative methods; Features of the iterative method; Application of the method to a low dimensional system.展开更多
The classical trajectory method is employed to calculate the rate coefficient kr for the reaction H++He+He-HHe++He at the temperatures ranging 200-350 K, based on an ab initio potential energy surface. The results sho...The classical trajectory method is employed to calculate the rate coefficient kr for the reaction H++He+He-HHe++He at the temperatures ranging 200-350 K, based on an ab initio potential energy surface. The results show that kr is strongly dependent on the temperature, which can be well fitted by the function kr=ATDr-3 with A=4.192x10-31 cm6/s and the reaction dimension Dr=2.706. The product molecules HHe+ are found in high vibrational states.展开更多
In this contribution we analyse some fundamental features of an iterative method to solve systems of linear equations, following the approve introduced in a previous work[l]. Such questions range from optimal paramete...In this contribution we analyse some fundamental features of an iterative method to solve systems of linear equations, following the approve introduced in a previous work[l]. Such questions range from optimal parameters and initial conditions to comparison with other methods. An interesting result is that a priori we can give an estimation of the number of iterations to get a given accuracy.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11175064 and 11475060the Construct Program of the National Key Discipline of Chinathe Hunan Provincial Innovation Foundation for Postgraduates under Grant No CX2014B195
文摘We use linear entropy of an exact quantum state to study the entanglement between internal electronic states and external motional states for a two-level atom held in an amplitude-modulated and tilted optical lattice. Starting from an unentangled initial state associated with the regular ＇island＇ of classical phase space, it is demonstrated that the quantum resonance leads to entanglement generation, the chaotic parameter region results in the increase of the generation speed, and the symmetries of the initial probability distribution determine the final degree of entanglement. The entangled initial states are associated with the classical ＇chaotic sea＇, which do not affect the final entanglement degree for the same initial symmetry. The results may be useful in engineering quantum dynamics for quantum information processing.
文摘Classical molecular dynamics simulation has been widely used to study the rapid cooling process of preparing amorphous alloys.However,the simulated cooling rate is several orders of magnitude higher than the experimental cooling rate.In this paper,Zr_(55)Cu_(35)Al_(10)alloy was taken as an example.It is found that adding isothermal annealing at a temperature slightly lower than Tand prolonging isothermal annealing time could effectively reduce the cooling rate.The glassy sample prepared in this way demonstrates significant energetic stability and well-developed short-range and medium-range order.
基金Supported by National Natural Science Foundation of China under Grant Nos.11247213,61368002,11304010,11264030,61168001China Postdoctoral Science Foundation under Grant No.2013M531558+4 种基金Jiangxi Postdoctoral Research Project under Grant No.2013KY33the Natural Science Foundation of Jiangxi Province under Grant No.20142BAB217001the Foundation for Young Scientists of Jiangxi Province(Jinggang Star)under Grant No.20122BCB23002the Research Foundation of the Education Department of Jiangxi Province under Grant Nos.GJJ13051,GJJ13057the Graduate Innovation Special Fund of Nanchang University under Grant No.cx2015137
文摘We have studied the dynamics and transfer of the entanglement of the two identical atoms simultaneously interacting with vacuum field by employing the dressed-state representation. The two atoms are driven by classical fields. The influence of the initial entanglement degree of two atoms, the coupling strength between the atom and the classical field and the detuning between the atomic transition frequency and the frequency of classical field on the entanglement and atomic linear entropy is discussed. The initial entanglement of the two atoms can be transferred into the entanglement between the atom and cavity field when the dissipation is neglected. The maximally entangled state between the atoms and cavity field can be obtained under some certain conditions. The time of disentanglement of two atoms can be controlled and manipulated by adjusting the detuning and classical driving fields. Moreover, the larger the cavity decay rate is, the more quickly the entanglement of the two atoms decays.
基金Partial supported by the Spanish Agency for International Cooperation and by the Comision Interministerial de Ciencia y Tecnol
文摘Presents a study which proposed an iterative approach to solve systems of linear equations. Definition of two families of convergent iterative methods; Features of the iterative method; Application of the method to a low dimensional system.
文摘The classical trajectory method is employed to calculate the rate coefficient kr for the reaction H++He+He-HHe++He at the temperatures ranging 200-350 K, based on an ab initio potential energy surface. The results show that kr is strongly dependent on the temperature, which can be well fitted by the function kr=ATDr-3 with A=4.192x10-31 cm6/s and the reaction dimension Dr=2.706. The product molecules HHe+ are found in high vibrational states.
基金This work has been partially supported by the Comision Interministerial de Ciencia y Tecnologa a of Spainunder grant PB98-0850
文摘In this contribution we analyse some fundamental features of an iterative method to solve systems of linear equations, following the approve introduced in a previous work[l]. Such questions range from optimal parameters and initial conditions to comparison with other methods. An interesting result is that a priori we can give an estimation of the number of iterations to get a given accuracy.
