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