Topologically protected entanglement switching around exceptional points.

ABSTRACT: The robust operation of quantum entanglement states is crucial for applications in quantum information, computing, and communications^1-3. However, it has always been a great challenge to complete such a task because of decoherence and disorder. Here, we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional points. By encircling the exceptional points on two overlapping Riemann energy surfaces, we have realized a chiral switch for entangled states with high fidelity. Owing to the topological protection conferred by the Riemann surface structure, this switching of chirality exhibits strong robustness against perturbations in the encircling path. Furthermore,

SUBMITTER: Tang Z 

PROVIDER: S-EPMC11252316 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature