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Acta Physica Sinica

Quantization of mesoscopic quartz piezoelectric crystal equivalent circuit

Hongqi Li, 菏泽学院物理系,菏泽274015

Published Jan 1, 2005• 9 citations
Publisher

Abstract

By using the idea of damped harmonic oscillator operation,a mesoscopic quartz piezoelectric crystal equivalent circuit is quantized. By this basic theory, we studied the quantum fluctuation of the voltage and current in each branch of the mesoscopic quartz piezoelectric crystal equivalent circuit under the squeezed vacuum state and the vacuum state.

DOI
10.7498/aps.54.1361

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By using the idea of damped harmonic oscillator operation,a mesoscopic quartz piezoelectric crystal equivalent circuit is quantized. By this basic theory, we studied the quantum fluctuation of the voltage and current in each branch of the mesoscopic quartz piezoelectric crystal equivalent circuit under the squeezed vacuum state and the vacuum state.
Mesoscopic series-parallel connection RLC circuit is quantized by the method of damped harmonic oscillator operation.On this basic theory,quantum fluctuations of the current and voltage of each branch in excitation state of the squeezed vacuum state,squeezed vacuum state and vacuum state are studied.The result shows that the quantum fluctuations of the current and voltage of each branch are related with not only parameter of the circuit element,but also quantum number of excitation,squeezed coefficients and squeezed angle.These fluctuations decay with time because of damped resistance.
In the framework of an advanced quantum theory for mesoscopic electric circuits in accord with the discreteness of electric charges, a mesoscopic quartz piezoelectric crystal equivalent circuit is quantized. To resolve the finite difference Schrödinger equation, an improved parameter perturbative method is proposed when WKB and perturbative method are inapplicable. With this method, the energy spectrum and wavefunctions of the system are obtained and used to calculate current quantum fluctuation as an application. The new method would be helpful to the application of the mesoscopic circuits quantum theory. Besides, the detail characters of energy spectrum and wavefunctions in the system would be helpful to the design of integrate circuit.
A mesoscopic parallel LC circuit model with double dissipative branch circuits is put forward according to the actual situation of the circuit.It is quantized with the theory of the classical circuit and the quantization method of damped harmonic oscillator.Then the quantum fluctuations of the voltage and the current of the circuit in vacuum state and the quantum fluctuations affected by the dissipative resistances are discussed.The results show that the quantum fluctuations of the voltage and the current of both branches are not only related with the parameters of the LC circuit components,but also affected by the dissipative resistances.They decay with the same exponential with time.The coefficients of the quantum fluctuations of the current are the same,while those of the voltage are different.When the two dissipative resistances are equal,the quantum fluctuations of the voltage and the current of both branches take on the same behavior respectively.
By referring to the idea of dealing with damped harmonic oscillator in quantum mechanics,the mesoscopic parallel RLC circuit with dissipative capacitance branch circuit is quantized.On this basis,the quantum fluctuations of the voltage and current of each branch circuit in vacuum state are studied.The result shows that the quantum fluctuations of the voltage and current of each branch circuit are related with the parameters of the circuit elements,and decay according to exponent along with time,and that the attenuations of the quantum fluctuations are the same,but their coefficients are different,and that the quantum fluctuations of the voltage and current of each branch circuit are affected by the dissipative resistance.