共查询到17条相似文献,搜索用时 390 毫秒
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在将介观无损耗传输线量子化的基础上, 研究了真空态和压缩真空态下传输线中电流和电流梯度的量子涨落. 着重分析了传输线与一般LC电路量子涨落的差异.
关键词:
介观无损耗传输线
真空态
压缩真空态
量子涨落 相似文献
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介观LC电路中电压、电流的量子涨落 总被引:53,自引:5,他引:48
从有源LC回路运动方程出发,通过引入正则变量、量子化有源LC电路,研究了真空态、压缩真空态下介观LC电路中电压、电流的量子涨落,并着重研究了压缩角对涨落的影响。 相似文献
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发展了一种有源RLC电路的量子力学处理方案,在此基础上研究了压缩真空态下介观RLC电路中电荷和电流的量子涨落,着重研究了电阻和压缩参数对量子涨落的影响.
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基于电荷取分立值的事实,运用阶梯算符的性质,计算电荷、电流以及能量的量子涨落,研究介观电子谐振腔的量子效应.结果表明,计及电荷量子化的事实,在阶梯算符本征态下介观电子谐振腔中电流的量子涨落为零,而电荷与能量的量子涨落不为零,分别与电荷的量子化性质有关,大小决定于系统自感、电容、栅压和形状因子以及状态参量等因素. 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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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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Quantum fluctuations of mesoscopic damped double resonance RLC circuit with mutual capacitance--inductance coupling in thermal excitation state 总被引:7,自引:0,他引:7 下载免费PDF全文
Based on the scheme of damped harmonic oscillator quantization and
thermo-field dynamics (TFD), the quantization of mesoscopic damped
double resonance RLC circuit with mutual capacitance--inductance
coupling is proposed. The quantum fluctuations of charge and current
of each loop in a
squeezed vacuum state are studied in the thermal excitation case. It is shown
that the fluctuations not only depend on circuit inherent parameters,
but also rely on excitation quantum number and squeezing parameter.
Moreover, due to the finite environmental temperature and
damped resistance, the fluctuations increase with the temperature rising,
and decay with time. 相似文献
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考虑电子与声子间相互作用,研究了两种声子库纯初始态(正则系综与粒子数态)下耗散介观电路的动力学特性.长时间极限下(t→∞):当环境处于热平衡态时,电路系统中的电流和电荷的平均值只与电路所处初始量子态中的平均值有关,与环境无关;环境初态为粒子数态时,电荷与电流平均值随时间的演化特性与环境初始处于热平衡态下时完全一样,表明介观电路中的电荷与电流的平均值与环境量子态的某组占有数无关.电路中电流和电荷的量子涨落不仅与系统的初态有关,还与系统所处环境的量子态及温度有关.一般地说,电路系统与环境的纠缠会
关键词:
介观耗散电路
声子库
量子初态
量子态纯度 相似文献
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本文利用含时微扰论,研究了电源幅值较小时介观LC电路中电荷与电流的量子涨落。在确定的温度下,系统将处在混合态,进一步得到有限温度下含源介观LC电路的量子涨落。研究表明有源介观LC电路的量子涨落不仅与电路参数有关,还与时间和温度有关。 相似文献
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Quantum Fluctuations in a Mesoscopic Inductance Coupling Circuit 总被引:9,自引:0,他引:9
Ji-Suo Wang Tang-Kun Liu Ming-Sheng Zhan 《International Journal of Theoretical Physics》2000,39(8):2013-2019
Starting from the equation of motion of a mesoscopic inductance coupling circuit,the quantum fluctuations of charge and current in the circuit are investigated inboth the eigenstates of the system and the squeezed vacuum state. The resultsshow that there exist quantum fluctuations of the charge and current in bothcases, and the fluctuations in each component circuit are connected. 相似文献