耦合引起的量子涨落减小

摘要

对于电容耦合电路的不同实际状态,研究了完全由耦合引起的量子涨落减小问题.如果耦合电路处于基态,或者开始时耦合电路解耦,那么分回路以及耦合部分的电荷量子涨落能够降低,而电流的量子涨落却不能.如果初始时,耦合部分是断开的,那么分回路中电流的涨落不能被压缩,而耦合部分电流的涨落以及各处电荷的涨落都会得到减小.%For different states of the mesoscopic capacitive coupled electric circuit, reduction of quantum fluctuations induced by the coupling was studied. If the coupled circuit is at its ground state, or initially the system is decoupled, quantum fluctuations of the electric charge everywhere can be reduced, but that of the electric current can not. If initially the coupling part is open, quantum fluctuations of the current in the component circuits can not be squeezed; but quantum fluctuations of the current in the coupling part and quantum fluctuations of the charge everywhere can be reduced.