32 citations · 109 across the 7 of their papers we have counts for
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quant-ph2021
Finite-temperature topological phase transitions of spin- systems in Uhlmann processes: General formalism and experimental protocols
Xu-Yang Hou, Hao Guo, Chih-Chun Chien
The Uhlmann process is built on the density matrix of a mixed quantum state and offers a way to characterize topological properties at finite temperatures. We analyze an ideal spin…
quant-ph2020★ 32 cited
Ubiquity of zeros of Loschmidt amplitude for mixed states in different physical processes and their implications
Xu-Yang Hou, Qu-Cheng Gao, Hao Guo +3
The Loschmidt amplitude of the purified states of mixed-state density matrices is shown to have zeros when the system undergoes a quasistatic, quench, or Uhlmann process. While the…
quant-ph2019
Dynamic process and Uhlmann process: Incompatibility and dynamic phase of mixed quantum states
Hao Guo, Xu-Yang Hou, Yan He +1
While a pure quantum state may accumulate both the Berry phase and dynamic phase as it undergoes a cyclic path in the parameter space, the situation is more complicated when mixed…