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.
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。
This method is not from the first principle. A better approach is based on the reduced density matrix, which eliminate the infinite number of the freedoms of the dissipative environment.
该方法不是从第一原理出发，因为耗散环境应该被看成是自由度为无限维的谐振子或原子系统，对它的求解最好的方式是求解约化密度矩阵方程。
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