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arXiv 2206.00534cond-mat.mes-hallquant-ph
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Weyl半金属中表面等离激元引起的长寿命量子比特纠缠

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

M Shoufie Ukhtary, Eddwi H. Hasdeo, Andriyan B. Suksmono, Ahmad R. T. Nugraha

摘要:

研究了外尔半金属中由非互易表面等离子体激元介导的两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非互易的SPP,这些SPP在拓扑结构上受到保护并位于光子带隙内。我们利用这种非互易SPP作为两个空间分离的量子比特纠缠的中介。我们的两个主要发现是:(1)非互易SPP给出比互易SPP更好的量子纠缠,以及(2)与在常规金属中使用SPP的纠缠相比,所实现的纠缠足够长的寿命。

英文摘要:

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.

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