A laser pulse can modify the electron s state so that it has the density distribution shown in green.
一束激光脉冲可以改变电子的状态，使得其有了图中绿色显示的密度分布。
Secondly, we investigate the energy density produced by a state vector which is the superposition of three single electron states in the Dirac field in the four-dimensional Minkowski spacetime.
然后，研究了在四维平直时空下三个单粒子态构成的量子态的负能密度。
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