Entangled Qubits Linked by Light

A quantum dot-nanoparticle-quantum dot system leverages a one-dimensional nanoparticle array to mediate qubit-qubit separation-denoted as $d_{qq}$-and interaction, governed by dipole-dipole coupling rates $g$ between quantum dots and nanoparticles, and $\kappa$ between neighboring nanoparticles, with the distance between each quantum dot and its nearest nanoparticle defined as $d_{qn}$.

Researchers have demonstrated a new method for sustaining entanglement between quantum bits using nanoscale structures that channel light, paving the way for more robust quantum networks.