论文标题
用于测量隧道时间的量子时钟的数值模拟
Numerical simulations of quantum clock for measuring tunneling times
论文作者
论文摘要
我们在数值上研究了两种使用量子时钟测量隧道时间的方法。在使用Larmor时钟的传统方法中，我们表明Larmor隧道时间可能会更短，以使其更短。在第二种方法中，我们研究了粒子通过潜在屏障传输时的自旋flip的概率，其中包括空间旋转的场与其自旋相互作用。根据绝热定理，概率取决于屏障内部粒子的速度。从数值上观察到，较高屏障的概率增加，这与Larmor Clock获得的结果一致。通过比较不同初始自旋态的结果，我们建议隧道时间明显减少的主要原因之一可能是在屏障结束时发生过滤效应。
We numerically study two methods of measuring tunneling times using a quantum clock. In the conventional method using the Larmor clock, we show that the Larmor tunneling time can be shorter for higher tunneling barriers. In the second method, we study the probability of a spin-flip of a particle when it is transmitted through a potential barrier including a spatially rotating field interacting with its spin. According to the adiabatic theorem, the probability depends on the velocity of the particle inside the barrier. It is numerically observed that the probability increases for higher barriers, which is consistent with the result obtained by the Larmor clock. By comparing outcomes for different initial spin states, we suggest that one of the main causes of the apparent decrease in the tunneling time can be the filtering effect occurring at the end of the barrier.
