Room-Temperature Giant Stark Effect of Single PhotonEmitter in van der Waals Material

Single photon emitters (SPEs) are critical building blocks needed for quantum science and technology1. For practical applications, room-temperature solid-state platforms are critically demanded2,3. To scale up quantum information processing using, for example, wavelength division multiplexing quantum key distribution, a large tuning range beyond emission linewidth of single photon energy is required. Stark effect can tune the single photon energy by an electric field. However, it has been achieved only at cryogenic temperature to pursue shift larger than emission linewidth4–7. A large stark tuning beyond emission linewidth at room temperature (RT) still remains elusive. Here we report the first RT Stark effect of SPEs with a record-high Stark shift of single photon energy more than 30 meV, largest among all previous color center emitters. Such a giant Stark shift is 4-fold larger than its linewidth at room temperature, demonstrated by exploiting hBN color centers. Moreover, the intrinsic broken symmetries...