论文标题
耦合到半无限传输线的超导码头的纠缠特性
Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line
论文作者
论文摘要
量子纠缠是量子信息处理中的关键资源，通过相关量子系统与其不可避免的嘈杂环境之间的相互作用降低。因此，研究开放量子系统中纠缠的动力学特性尤其重要。在这项工作中，我们主要专注于两个量子位，耦合到可调环境，即半无限传输线。可以通过量子位的过渡频率来调整两个量子位的放松，即通过单个通道或集体通道或两者兼而有之。我们使用初始Werner状态检查了该模型系统中的纠缠动态，并表明可以观察到纠缠猝死和复兴现象。由于在实验上准备好Werner状态的硬度，我们引入了一种新型的纠缠状态，称为Pseudo-Werner State，该状态保留了与Werner State一样多的纠缠财产，更重要的是，实验友好。此外，我们提供了详细的程序，用于生成伪妻子状态并使用它研究纠缠动态，可以直接实现在超导的波导量子电动动力系统中。
Quantum entanglement, a key resource in quantum information processing, is reduced by interaction between the quantum system concerned and its unavoidable noisy environment. Therefore it is of particular importance to study the dynamical properties of entanglement in open quantum systems. In this work, we mainly focus on two qubits coupled to an adjustable environment, namely a semi-infinite transmission line. The two qubits' relaxations, through individual channels or collective channel or both, can be adjusted by the qubits' transition frequencies. We examine entanglement dynamics in this model system with initial Werner state, and show that the phenomena of entanglement sudden death and revival can be observed. Due to the hardness of preparing the Werner state experimentally, we introduce a new type of entangled state called pseudo-Werner state, which preserves as much entangling property as the Werner state, and more importantly, is experiment friendly. Furthermore, we provide detailed procedures for generating pseudo-Werner state and studying entanglement dynamics with it, which can be straightforwardly implemented in a superconducting waveguide quantum electrodynamics system.
