Thus quantum fidelity is a useful tool in characterizing quantum phase transitions without finding an order parameter of the system.
用量子保真度探测系统量子相变的好处是可以避免寻找系统的序参数。
We find the reduced fidelity is an effective tool in detecting the quantum phase transitions associated with level crossings for the finite-size systems.
我们发现在有能级交叉的有限大尺寸系统中，约化保真度是一个测量量子相变的有效工具。
Finally, we apply the theory to study the quantum phase transitions of one-dimensional anisotropic XY quantum spin chain in a transverse field at zero temperature.
最后我们采用李—杨零点方法对一维横场各向异性XY模型在零温下的量子相变作了较为系统的研究。
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。
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。
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