论文标题
1/f噪声和量子不确定性
1/f noise and quantum indeterminacy
论文作者
论文摘要
基于傅立叶变换信号的不确定性关系，开发了导体中1/F电压噪声问题的方法。在不同时间可观察到的不交流性引起的量子不确定性使电压自动加速度模棱两可，但波动的功率谱仍然明确定义。结果表明，在功率谱上的下限存在，这与电压相关函数的反对称部分有关。使用Schwinger-keldysh方法，如果具有抛物线分散剂的非极化电荷载体，则可以明确计算该结合，并发现其具有1/F的低频渐近性。与INGAAS量子井中的1/f-noise测量值进行了比较，这表明观察到的噪声水平仅比已建立的界限高几倍。
An approach to the problem of 1/f voltage noise in conductors is developed based on an uncertainty relation for the Fourier-transformed signal. The quantum indeterminacy caused by non-commutativity of the observables at different times makes the voltage autocovariance ambiguous, but the power spectrum of fluctuations remains well-defined. It is shown that a lower bound on the power spectrum exists, which is related to the antisymmetric part of the voltage correlation function. Using the Schwinger-Keldysh method, this bound is calculated explicitly in the case of unpolarized charge carriers with a parabolic dispersion, and is found to have a 1/f low-frequency asymptotic. A comparison with the 1/f-noise measurements in InGaAs quantum wells is made which shows that the observed noise levels are only a few times higher than the bound established.
