非耗散介观LC电路中电荷和电流的压缩与反压缩效应

SQUEEZING AND ANTISQUEEZING EFFECT OF CHARGE AND CURRENT OF A NON-DISSIPATIVE MESOSCOPIC LC CIRCUIT

利用全量子理论 ,对非耗散介观 LC电路中电荷和电流的压缩与反压缩效应进行了详细的讨论 .结果表明 :1 )通过保持非耗散介观 LC电路的固有频率不变 ,而使电感参量作阶跃函数变化 ,就可将介观 L C电路由初始的真空态经相干态而演化到压缩相干态 ;并由此进一步分别制备出电荷与电流的压缩最小测不准态 ;2 )通过控制电感参量的改变 ,可使电荷与电流的量子涨落呈现出压缩与反压缩效应 .

In this paper,the squeezing and antisqueezing effects of the charge and current of non-dissipative mesoscopic LC circuit are studied in detail by using the complete quantum theory.The results show the following conclusions:1)By keeping the frequency of non-dissipative mesoscopic LC circuit a constant and its parameter varying with the step function,the quantum state of the circuit evolves to the squeezed coherent state from the initial vacuum state through coherent state,then further the squeezed minimum uncertainty state of charge or current can be generated.2)The squeezing and antisqueezing effect of the quantum fluctuations appears in the circuit by adjusting its inductor′s parameter under the effect of external source.