Spectrally Stable Defect Qubits with no Inversion Symmetry for Robust Spin-To-Photon Interface
Péter Udvarhelyi, Roland Nagy, Florian Kaiser, Sang-Yun Lee, Jörg Wrachtrup, Adam Gali · Physical Review Applied · 2019
Spectrally stable quantum emitters, robust spin-photon interfaces that are insensitive to stray electric fields, are great for quantum information processing. Here quantum defects with inversion symmetry are seen as the ultimate solution, but the authors show that inversion symmetry is $n\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}t$ a prerequisite for weak coupling to electric fields during optical excitation. Rather, the same spatial localization of ground and excited wave functions of defect states is sufficient. Calculations of a silicon-vacancy center in SiC reveal that it is such a nearly ideal quantum defect. These findings expand the search for ideal quantum emitters in compound semiconductors.