Stark Tuning of Telecom Single-Photon Emitters Based on a Single Er³⁺

The implementation of scalable quantum networks requires photons at the telecom band and long-lived spin coherence. The single Er³⁺ in solid-state hosts is an important candidate that fulfills these critical requirements simultaneously. However, to entangle distant Er³⁺ ions through photonic connections, the emission frequency of individual Er³⁺ in solid-state matrix must be the same, which is challenging because the emission frequency of Er³⁺ depends on its local environment. Herein, we propose and experimentally demonstrate the Stark tuning of the emission frequency of a single Er³⁺ in a Y₂SiO₅ crystal by employing electrodes interfaced with a silicon photonic crystal cavity. We obtain a Stark shift of 182.9±0.8 MHz, which is approximately 27 times of the optical emission linewidth, demonstrating promising applications in tuning the emission frequency of independent Er³⁺ into the same spectral channels. Our results provide a useful solution for construction of scalable quantum networks based on single Er³⁺ and a universal tool for tuning emission of individual rare-earth ions.