【摘要】 为提高信号的稳定性和保真度,对电路中的量子涨落进行了研究.利用热场动力学(TFD)方法计算了有限温度下介观电容耦合电路中的量子涨落.在零温情况下,电容耦合电路的本征态是平移Fock态.有限温度时,这些态成为热平移Fock态.计算结果表明,对于以往未加注意的电路耦合部分,电容耦合使电荷的量子涨落减小,电流的量子涨落增加.更多还原

【Abstract】 Using the thermal field dynamics, the quantum fluctuations in the capacitive coupled electric circuits at finite temperature are calculated. At zero temperature, the eigenstates of the capacitive coupled electric circuit are the displaced Fock states. At finite temperature, the states become the thermal displaced Foek states. The results show that, in the coupling part of the circuit, which is not studied in former discussions, capacitance coupling reduces the quantum fluctuation of the electric charge and increase that of the electric current.更多还原