Quantum Squeezing Effects of a Nondissipative Mesoscopic Circuit with Coupled Inductors an.pdf

CHINPHYSLETT Vol No Quantum Squeezing Eects of a Nondissipative Mesoscopic Circuit with Coupled Inductors and Capacitors LEI MinSheng
 JI YingHua   XIE FangSen   Departmen t of Physics Jiangxi Normal University Nanchang Received June The quantum uctuations of the charge and current in a nondissipative mesoscopic circuit with coupled inductors and capacitors are studied for the squeezed vacuum state The inuence of the phase angle up on the quantum uctuations is discussed in particular Our results indicate that when the circuit parameters remain constant and the phases of the two circuits are equal the squeezing of the charge or its conjugate variable increases When the dierence of the two phases equals 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 phase carefully PA CS w Lc The development of nanometre techniques and mi electric charge From the Lagrangian the conjugate cro electronics has led to the miniaturization of inte momenta p and p are given by ards the atomic grated circuits and comp onents tow L scale When the inelastic coherence length of the p L L I L I a q chargecarriers approaches the Fermi wavelength clas sical physics b ecomes invalid and quantum eects p L L L I L I b must b e considered Much attention has b een paid q to mesoscopic physics in recent years while so far where the variables q and p play the part of the j j