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

TL;DR

This paper demonstrates that nonreciprocal surface plasmon polaritons in Weyl semimetals can mediate long-lived, high-quality entanglement between distant qubits, outperforming conventional metal-based SPPs.

Contribution

It introduces the use of topologically protected, nonreciprocal SPPs in Weyl semimetals for enhanced, long-lived qubit entanglement, a novel approach in quantum information.

Findings

Nonreciprocal SPPs improve quantum entanglement quality.

Entanglement mediated by Weyl semimetal SPPs is longer-lived.

Topologically protected SPPs reside inside the photonic gap.

Abstract

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.