Quantum squeezing effects of a non-dissipative mesoscopic circuit with coupled inductors and capacitors

The quantum fluctuations of the charge and current in a non-dissipative mes oscopic circuit with coupled inductors and capacitors are studied for the s queezed vacuum state. The influence of the phase angle upon the quantum flu ctuations is discussed in particular. Our results indicate that when the ci rcuit parameters remain constant and the phases theta of the two circuits a re equal, the squeezing of the charge or its conjugate variable increases. When : the difference of the two phases equals pi, the squeezing will deter iorate. Therefore, if we want to decrease the quantum noise, we should not only control the amplitude r, but also control the phase theta carefully.