标题： 通过外尔半金属中的表面等离极化激元实现长寿命量子比特纠缠 显示英文标题

标题： Long-lived qubit entanglement by surface plasmon polaritons in a Weyl semimetal

摘要： 我们研究了通过外尔半金属中的非互易表面等离极化子（SPPs）介导的两个量子比特的自发纠缠。在没有外部磁场的情况下，外尔半金属的拓扑结构甚至会产生拓扑保护并存在于光子带隙内的非互易SPP。我们利用这种非互易SPP作为两个空间分离的量子比特的纠缠媒介。我们的两个主要发现是：(1) 非互易SPP比互易SPP能提供更好的量子纠缠，(2) 与使用传统金属中的SPP获得的纠缠相比，实现的纠缠具有足够长的寿命。 显示英文摘要

摘要： We investigate spontaneous entanglement of two qubits mediated by nonreciprocal surface plasmon polaritons (SPPs) in a Weyl semimetal. In the absence of external magnetic fields, the topology of the Weyl semimetal even gives rise to nonreciprocal SPPs that are topologically protected and reside inside the photonic gap. We utilize this nonreciprocal SPP as a mediator of entanglement of two spatially-separated qubits. Our two main findings are: (1) the nonreciprocal SPP gives better quantum entanglement than the reciprocal one, and (2) the achieved entanglement is sufficiently long-lived compared to the entanglement using SPPs in conventional metals.