论文标题
开放拓扑系统中拓扑相变和Weyl点的见证
Witness of topological phase transition and Weyl points in an open topological system
论文作者
论文摘要
最近，在超导量子电路中成功模拟了可调的Weyl-核酸仪带和联接拓扑相变[X。 tan，\ textit {et al。} phys。莱特牧师。 {\ bf 122}，010501（2019）]。由于超导量子电路不可避免地会融入环境，因此我们在这里通过通过量子主方程来考虑储层来关注稳态和破坏过程。我们的结果表明，稳态的纯度可用于指示拓扑相变和Weyl点。此外，连贯性将指数衰减至Weyl点的零，并在动量空间中的其他点上衰减至非零值。我们的工作可能会对量子开放拓扑系统的研究产生重大影响。
Recently, the tunable Weyl-semimetal bands and the associate topological phase transition have been successfully simulated in superconducting quantum circuits [X. Tan, \textit{et al.} Phys. Rev. Lett. {\bf 122}, 010501 (2019)]. Since the superconducting quantum circuits inevitably couple to the environment, we here focus on the steady state and decoherence process by taking the reservoir into consideration via quantum master equation. Our results show that the purity of the steady state can be used to indicate the topological phase transition and Weyl points. Furthermore, the coherence will exponentially decay to zero at the Weyl points, and decay to a nonzero value with oscillation at other points in the momentum space. Our work may have significant impact on the study of quantum open topological system.
