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arXiv quant-ph/0008079quant-ph
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相位扩散作为噪声存在下相干抑制隧穿的模型

Phase diffusion as a model for coherent suppression of tunneling in the presence of noise

J. Grondalski, P. M. Alsing, I. H. Deutsch

摘要:

研究了受随机周期$δ-$函数“kicks”影响的双势阱隧穿相干抑制的稳定性。我们模型耗散由于这个随机过程作为一个有效的两级系统的相扩散过程,并推导出相应的一组布洛赫方程与相阻尼项,同意在离散时间周期性踢系统。我们证明,噪声本地化的双阱势两侧的系统的能力产生振荡的相位过阻尼,而不是从噪声和驱动场之间的任何合作效应。该模型与方波驱动器,它具有定性类似的功能,广泛研究的余弦驱动器,但有额外的优势,让一个推导出精确的解析表达式。

英文摘要:

We study the stabilization of coherent suppression of tunneling in a driven double-well system subject to random periodic $δ-$function ``kicks''. We model dissipation due to this stochastic process as a phase diffusion process for an effective two-level system and derive a corresponding set of Bloch equations with phase damping terms that agree with the periodically kicked system at discrete times. We demonstrate that the ability of noise to localize the system on either side of the double-well potenital arises from overdamping of the phase of oscillation and not from any cooperative effect between the noise and the driving field. The model is investigated with a square wave drive, which has qualitatively similar features to the widely studied cosinusoidal drive, but has the additional advantage of allowing one to derive exact analytic expressions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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