The quantum fluctuations of the charge and current in a non-dissipative mesoscopic circuit with coupled inductors and capacitors are studied for the squeezed vacuum state.The influence of the phase angle upon the quan...The quantum fluctuations of the charge and current in a non-dissipative mesoscopic circuit with coupled inductors and capacitors are studied for the squeezed vacuum state.The influence of the phase angle upon the quantum fluctuations is discussed in particular.Our results indicate that when the circuit parameters remain constant and the phasesθof the two circuits are equal,the squeezing of the charge or its conjugate variable increases.When the difference of the two phases equalsπ,the squeezing will deteriorate.Therefore,if we want to decrease the quantum noise,we should not only control the amplitude r,but also control the phaseθcarefully.展开更多
In order to preserve virus for identifying the resistance of rice varieties against rice black-streaked dwarf disease, a simple and reliable method was developed, through which virus-free small brown planthopper （SBP...In order to preserve virus for identifying the resistance of rice varieties against rice black-streaked dwarf disease, a simple and reliable method was developed, through which virus-free small brown planthopper （SBPH） acquired rice black-streaked dwarf virus （RBSDV） from frozen infected leaves and the virus was transmitted to healthy rice plants. The experimental results showed that SBPH could obtain RBSDV from frozen infected rice leaves and the virus could be transmitted to a susceptible rice variety. For the ability to acquire RBSDV and transmit the virus to healthy plants by SBPH, there was no significant difference between frozen infected leaves and in vitro infected leaves. The novel method could be applied to identification of rice variety resistance to rice black-streaked dwarf disease, facilitating the breeding process for rice black-streaked dwarf disease resistance.展开更多
Taking into account the interaction between electrons and phonons,in the case without-rotating-waveapproximation,we study the entangling property between the mesoscopic circuit and environment at coherent state orequi...Taking into account the interaction between electrons and phonons,in the case without-rotating-waveapproximation,we study the entangling property between the mesoscopic circuit and environment at coherent state orequilibrimn state.The result indicates that,in long time limit t→∞,the averages of charge and current in the circuitonly depend on the average of the system at the initial state when the environment is initially at thermal equilibrium.However,when the environment is initially at coherent state,the average of charge and current in the circuit is determinedby the specific coherent state ensemble.Generally speaking,the entanglement between the circuit and environment willlead to the quantum state purity declining of the circuit,then the circuit emerges decoherent phenomenon,and so amixed state appears.Purity changes are related to the initial quantum state of environment and circuit.With thefurther evolution of time,coherence will be gradually restored,but cannot return to 1.展开更多
文摘The quantum fluctuations of the charge and current in a non-dissipative mesoscopic circuit with coupled inductors and capacitors are studied for the squeezed vacuum state.The influence of the phase angle upon the quantum fluctuations is discussed in particular.Our results indicate that when the circuit parameters remain constant and the phasesθof the two circuits are equal,the squeezing of the charge or its conjugate variable increases.When the difference of the two phases equalsπ,the squeezing will deteriorate.Therefore,if we want to decrease the quantum noise,we should not only control the amplitude r,but also control the phaseθcarefully.
基金supported by the National Basic Research Program(Grant No.2010CB126203)Special Fund for Agro-scientific Research in the Public Interest(Grant No. 201003031)the National Natural Science Foundation of Jiangsu Province,China(Grant Nos.BK2009325 and BK2010018)
文摘In order to preserve virus for identifying the resistance of rice varieties against rice black-streaked dwarf disease, a simple and reliable method was developed, through which virus-free small brown planthopper （SBPH） acquired rice black-streaked dwarf virus （RBSDV） from frozen infected leaves and the virus was transmitted to healthy rice plants. The experimental results showed that SBPH could obtain RBSDV from frozen infected rice leaves and the virus could be transmitted to a susceptible rice variety. For the ability to acquire RBSDV and transmit the virus to healthy plants by SBPH, there was no significant difference between frozen infected leaves and in vitro infected leaves. The novel method could be applied to identification of rice variety resistance to rice black-streaked dwarf disease, facilitating the breeding process for rice black-streaked dwarf disease resistance.
基金the Natural Science Foundation of Jiangxi Province of China under Grant No.2007GZW0187
文摘Taking into account the interaction between electrons and phonons,in the case without-rotating-waveapproximation,we study the entangling property between the mesoscopic circuit and environment at coherent state orequilibrimn state.The result indicates that,in long time limit t→∞,the averages of charge and current in the circuitonly depend on the average of the system at the initial state when the environment is initially at thermal equilibrium.However,when the environment is initially at coherent state,the average of charge and current in the circuit is determinedby the specific coherent state ensemble.Generally speaking,the entanglement between the circuit and environment willlead to the quantum state purity declining of the circuit,then the circuit emerges decoherent phenomenon,and so amixed state appears.Purity changes are related to the initial quantum state of environment and circuit.With thefurther evolution of time,coherence will be gradually restored,but cannot return to 1.
