论文标题
动力噪声对主要界面状态的影响
Effects of dynamical noises on Majorana bound states
论文作者
论文摘要
可以利用拓扑超导体中未配对的主要约束状态（MBS）的非本地性质，以创建受拓扑保护的量子，并通过编织来执行栅极操作，并执行栅极操作。但是，耦合到任何现实系统不可避免的环境引起的时间依赖性噪声可能会破坏拓扑保护。在这项工作中，我们研究了最近提出的一维拓扑超导体在MBSS上的各种动力噪声（例如Lorentzian，Thermal和Quantum Point接触）的影响。我们首先研究Kitaev P波超导体，并检查远程跳和配对对MBS过渡速率的影响。我们发现，尤其是远程配对可显着降低结合状态的过渡速率。然后，我们考虑最近发现的拓扑超导纳米线和磁链。我们的发现是最近尝试操纵MBS的尝试。特别是，对于后两个实验实现的系统，我们认为磁性/Zeeman磁场和强旋转轨道耦合如何使MBS对噪声更加稳健。
The nonlocal nature of unpaired Majorana bound states (MBSs) in topological superconductors can be exploited to create topologically protected qubits and perform gate operations fault-tolerantly via braidings. However, the time-dependent noises induced by coupling to an environment which is inevitable in any realistic system could spoil the topological protection. In this work, we study the effects of various dynamical noises such as Lorentzian, thermal, and quantum point contact on the MBSs in the recently proposed one-dimensional topological superconductors. We begin by investigating the Kitaev p-wave superconductors and examine the effects of long-range hopping and pairing on the transition rate of MBSs. We found that, especially, the long-range pairings significantly reduce the transition rate of bound states. Then, we consider the recently discovered topological superconducting nanowires and magnetic chains. Our findings are consequential for the recent attempts to manipulate MBSs. In particular, for the latter two experimentally realized systems we argue how low magnetic/Zeeman fields and strong spin-orbit coupling make the MBSs more robust to noises.
