共查询到17条相似文献,搜索用时 312 毫秒
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压缩真空态下介观耦合电路的量子涨落及电源对量子涨落的影响 总被引:18,自引:0,他引:18
通过对无耗耦合含源介观电路的量子化和哈密顿量的对角化,求出了耦合电路的能谱,研究了压缩真空态下介观电路中电荷、电流的量子涨落和电源对量子涨落的影响。 相似文献
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介观互感耦合阻尼并联双谐振电路的量子涨落 总被引:5,自引:1,他引:4
对介观互感耦合阻尼并联电路作双模耦合阻尼谐振子处理,将其量子化.通过三次幺正变换,将体系的哈密顿量对角化.在此基础上给出了体系的本征能谱,研究了Fock态、真空态下各回路电流和电压的量子涨落. 相似文献
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利用热场动力学的方法研究了介观RLC电路在具有热噪声的真空态下电荷和磁通(电流)的量子涨落.从而得到了有限温度下这一电路在热真空态下的量子涨落与温度的关系.结果表明,介观RLC电路的量子涨落不仅与电路中的元件参量和电路的共振频率ω有关,而且与温度T有关.温度越高,介观RLC电路的量子噪声越大
关键词:
介观RLC电路
热真空态
量子涨落 相似文献
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压缩角对介观耦合电压缩效应的影响 总被引:3,自引:0,他引:3
从无耗散的电感耦合是电路的经典运动方程出发,研究了压缩真空态下介观电感耦合电路中电荷和电流的量子涨落;着重分析了压缩幅角参数对电荷和电流量子压缩效应的影响,结果表明:在任意幅角θ下,电荷或电流的量子涨落不是随压缩参数r增加而单调地减小,而是存在着一个极小值。 相似文献
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Using the quantum theory for a
mesoscopic circuit based on the discretenes of electric charges,
the finite-difference Schrödinger equation of the non-dissipative mesoscopic inductance and capacity coupling circuit is achieved. The Coulomb blockade effect, which is caused
by the discreteness of electric charges, is studied. Appropriately
choose the components in the circuits, the finite-difference
Schrödinger equation can be divided into two Mathieu
equations in \hat p representation. With the WKBJ method, the
currents quantum fluctuations in the ground states of the two
circuits are calculated. The results show that the currents
quantum zero-point fluctuations of the two circuits are exist and
correlated. 相似文献
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Ji-Suo Wang Tang-Kun Liu Ming-Sheng Zhan 《International Journal of Theoretical Physics》2000,39(11):2595-2603
Starting from the classical equation of motion for a mesoscopic capacitancecoupling circuit, we study the quantum fluctuations of charge and current of themesoscopic capacitance coupling circuit in a displaced squeezed Fock state. Itis found that the quantum fluctuations of charge and current in each componentcircuit depend on the devices of two circuits and the squeezing parameters, whilethe fluctuations do not depend on displacement parameters. 相似文献
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Under the Born-von-Karmann periodic boundary condition, we
propose a quantization scheme for non-dissipative distributed parameter
circuits (i.e. a uniform periodic transmission line). We find the unitary
operator for diagonalizing the Hamiltonian of the uniform periodic
transmission line. The unitary operator is expressed in a coordinate
representation that brings convenience to deriving the density matrix
ρ(q,q',β). The quantum fluctuations of charge and current at a definite temperature have been studied. It is shown that quantum fluctuations of distributed parameter circuits, which also have distributed
properties, are related to both the circuit parameters and the positions and
the mode of signals and temperature T. The higher the temperature
is, the stronger quantum noise the circuit exhibits. 相似文献
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Quantum Fluctuations in Thermal Vacuum State for Two LC Circuits with Mutual Inductance 总被引:16,自引:0,他引:16
Tong-Qiang Song 《International Journal of Theoretical Physics》2003,42(4):793-800
By means of thermal field dynamics theory, we study the quantum fluctuations of two LC circuits with mutual inductance at a finite temperature. 相似文献
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QUANTUM FLUCTUATIONS IN A MESOSCOPIC DAMPED LC PARALLEL CIRCUIT IN DISPLACED SQUEEZED FOCK STATE 总被引:3,自引:0,他引:3 下载免费PDF全文
We study the quantum effects of a damped LC parallel circuit considering its different performance from an RLC series circuit in classical physics. The damped LC parallel circuit with a source is quantized and the quantum fluctuations of magnetic flux and electric charge in the circuit in displaced squeezed Fock state are investigated. It is shown that, as in the RLC series circuit, the fluctuations only depend on the squeezing parameter and the parameters of the circuit components in the damped LC parallel circuit, but the effects of the circuit components on the fluctuations are different in the two circuits. 相似文献
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S.Ya. Kilin 《Optics Communications》1985,53(6):409-411
It is shown that correlation of quantum atomic fluctuations for coupled modes at forward degenerate four-wave mixing leads to atomic noise reduction from the in-phase quadrature variance of the mode which is a linear combination of the coupled signal and probe modes. Thus, quantum atomic fluctuations are not an obstacle for the squeezed-state generation via degenerate four-wave mixing. 相似文献