Transform-Limited Photon Emission from a Lead-Vacancy Center in Diamond above 10 K
Peng Wang, Lev Kazak, Katharina Senkalla, Petr Siyushev, Ryotaro Abe, Takashi Taniguchi, Shinobu Onoda, Hiromitsu Kato, Toshiharu Makino, Mutsuko Hatano, Fedor Jelezko, Takayuki Iwasaki
Abstract
Transform-limited photon emission from quantum emitters is essential for high-fidelity entanglement generation. In this Letter, 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 4 orders of magnitude different linewidths of the two zero-phonon lines, and find that the phonon-induced relaxation in the ground state contributes to this huge difference in the linewidth. Because of 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.