Transform-limited photon emission from quantum emitters is essential for high-fidelity entanglement generation. In this study, we report the coherent optical property of a single negatively-charged lead-vacancy (PbV) center in diamond. Photoluminescence excitation measurements reveal stable fluorescence with a linewidth of 39 MHz at 6 K, close to the transform-limit estimated from the lifetime measurement. We observe four orders of magnitude different linewidths of the two zero-phonon-lines, and find that that the phonon-induced relaxation in the ground state contributes to this huge difference in the linewidth. Due to the suppressed phonon absorption in the PbV center, we observe nearly transform-limited photon emission up to 16 K, demonstrating its high temperature robustness compared to other color centers in diamond.
@article{arxiv.2308.00995,
title = {Transform-Limited Photon Emission From a Lead-Vacancy Center in Diamond Above 10 K},
author = {Peng Wang and Lev Kazak and Katharina Senkalla and Petr Siyushev and Ryotaro Abe and Takashi Taniguchi and Shinobu Onoda and Hiromitsu Kato and Toshiharu Makino and Mutsuko Hatano and Fedor Jelezko and Takayuki Iwasaki},
journal= {arXiv preprint arXiv:2308.00995},
year = {2023}
}