在量子力学里,密度算符(density operator)与其对应的密度矩阵(density matrix)专门描述混合态量子系统的物理性质。约化密度算符的点子最先由保罗·狄拉克于1930年提出。
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根据约化密度矩阵与基态能量之间的关系,我们给出了约化保真率和量子相变之间的一般关系。
A general connection between the reduced fidelity susceptibility and quantum phase transitions is given in terms of the relation between reduced density matrix and ground-state energy.
两个两能级原子置于外部环境(热库)中,当计及原子偶极间的相互作用时,通过研究两个原子约化密度矩阵,分析原子状态消相干规律。
We study a pair of two-level atoms reducible density rectangular array when atoms by dipole-dipole interaction are put in a thermal reservoir. Decoherence of atoms is analyzed.
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