作为耦合的结果，单粒子态被量子云覆盖起来。
As a result of the coupling, the single-particle states are clothed in a cloud of quanta.
而散射算符对准粒子态的矩阵元同相应的单粒子态的矩阵元完全一样。
The scattering matrix elements for the quasi particle are the same as those of the single particle.
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。
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.
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