Dobrovitski V V, De Raedt H A, Katsnelson M I, Harmon B N
Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.
Phys Rev Lett. 2003 May 30;90(21):210401. doi: 10.1103/PhysRevLett.90.210401.
We study numerically the damping of quantum oscillations and the dynamics of the density matrix in model many-spin systems decohered by a spin bath. We show that oscillations of some density matrix elements can persist with considerable amplitude long after other elements, along with the entropy, have come close to saturation, i.e., when the system has been decohered almost completely. The oscillations exhibit very slow decay, and may be observable in experiments.
我们通过数值方法研究了在由自旋浴导致退相干的多自旋模型系统中量子振荡的阻尼以及密度矩阵的动力学。我们表明，在其他元素以及熵接近饱和之后很久，即当系统几乎完全退相干时，一些密度矩阵元素的振荡仍能以相当大的幅度持续存在。这些振荡呈现出非常缓慢的衰减，并且可能在实验中被观测到。
