Topologically protected strong coupling and entanglement between distant quantum emitters

TL;DR

This paper proposes a topological photonic platform that enables robust, long-distance strong coupling and entanglement between quantum emitters, enhancing scalability and robustness in quantum information processing.

Contribution

It introduces a novel scheme using topologically protected edge states and corner cavities to achieve and maintain strong coupling and entanglement between distant quantum emitters.

Findings

Strong coupling achieved over long distances.

Topologically protected entanglement demonstrated.

Quantum beat duration significantly extended.

Abstract

The realization of robust strong coupling and entanglement between distant quantum emitters (QEs) is very important for scalable quantum information processes. However, it is hard to achieve it based on conventional systems. Here, we propose theoretically and demonstrate numerically a scheme to realize such strong coupling and entanglement. Our scheme is based on the photonic crystal platform with topologically protected edge state and zero-dimensional topological corner cavities. When the QEs are put into topological cavities, the strong coupling between them can be fulfilled with the assistance of the topologically protected interface state. Such a strong coupling can maintain a very long distance and be robust against various defects. Especially, we numerically prove that the topologically protected entanglement between two QEs can also be realized. Moreover, the duration of quantum beats for such entanglement can reach several orders longer than that for the entanglement in a conventional photonic cavity, making it be very beneficial for a scalable quantum information process.