Biphoton entanglement of topologically-distinct modes

TL;DR

This paper demonstrates biphoton entanglement between topologically distinct modes in silicon waveguides, revealing topology as a new degree of freedom for quantum entanglement and potential quantum information applications.

Contribution

It introduces the first experimental demonstration of entanglement across different topological modes in integrated photonic systems.

Findings

Biphoton entanglement achieved between topologically distinct modes.

Topology can serve as an additional degree of freedom for quantum entanglement.

Potential for quantum information transfer between trivial and topological modes.

Abstract

The robust generation and manipulation of entangled multiphoton states on-chip has an essential role in quantum computation and communication. Lattice topology has emerged as a means of protecting photonic states from disorder but entanglement across different topologies remained unexplored. We report biphoton entanglement between topologically distinct spatial modes in a bipartite array of silicon waveguides. The results highlight topology as an additional degree of freedom for entanglement and open avenues for investigating information teleportation between trivial and topological modes.