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arXiv quant-ph/9511013quant-ph
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含奇异项含时谐振子相干态和压缩态的群论研究

Group Theoretical Approach to the Coherent and the Squeeze States of a Time-Dependent Harmonic Oscillator with a Singular Term

Jung Kon Kim, Sang Pyo Kim

摘要:

对于具有平方反比奇异项的含时谐振子,利用$SU(2)$的李代数求出了广义不变量,利用$SU(1,1)$的谱生成李代数构造了数型本征态和相干态.得到了这两种李代数的演化算子。从群论的角度构造了含奇异项的含时谐振子和不含时谐振子的数型本征态和相干态。结果表明,压缩算符将$SU(1,1)$的谱生成李代数的含时基酉变换为广义不变量,从而将初始真空演化为最终的相干真空.

英文摘要:

For a time-dependent harmonic oscillator with an inverse squared singular term, we find the generalized invariant using the Lie algebra of $SU(2)$ and construct the number-type eigenstates and the coherent states using the spectrum-generating Lie algebra of $SU(1,1)$. We obtain the evolution operator in both of the Lie algebras. The number-type eigenstates and the coherent states are constructed group-theoretically for both the time-independent and the time-dependent harmonic oscillators with the singular term. It is shown that the squeeze operator transforms unitarily the time-dependent basis of the spectrum-generating Lie algebra of $SU(1,1)$ for the generalized invariant, and thereby evolves the initial vacuum into a final coherent vacuum.

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