Although we usually assume that a "perfect" material is required to produce the best emitters for nano-optical devices\, defe ct states in wide bandgap semiconductors are defining a new frontier f or quantum information technologies\, offering correlated spin-photon information. Numerous materials platforms have been explored\, includi ng single crystal diamond\, SiC and Si: ultimately these defect qubits will need to satisfy quantum systems-level requirements for coherence \, brightness\, and equivalence of states.
\nThis talk will int roduce some building-block devices for the evaluation of candidate def ect qubits\, with a focus on Silicon Vacancies in 4H-SiC. Nanobeam pho tonic crystal cavities serve as both exquisitely sensitive optical amp lifiers [1]\, as well as "nanoscopes" that allow us to better understa nd the local environment of the silicon vacancies\, interactions with proximal defects and pathways to better processing and control of the defects [2].
\nForming defects directly into cavities by "Laser Writing" allows more rapid feedback of optimal defect formation condi tions [3]. Embedding G-center defects in Si\, within PN diodes allows a dynamic assessment of processing conditions and fine-tuning of defec t properties [4]. In aggregate\, these techniques help to build the fo undational understanding to take defect qubits to the “next steps” in implementing new quantum information technologies.
\n[1] Br
acher\, David O.\, Xingyu Zhang\, and Evelyn L. Hu. "Selective Purcell
enhancement of two closely linked zero-phonon transitions of a silico
n carbide color center." Proceedings of the National Academy of Scienc
es 114.16 (2017): 4060-4065.
\n[2] Gadalla\, Mena N.\, Andrew S.
Greenspon\, Rodrick Kuate Defo\, Xingyu Zhang\, and Evelyn L. Hu. "Enh
anced cavity coupling to silicon vacancies in 4H silicon carbide using
laser irradiation and thermal annealing." Proceedings of the National
Academy of Sciences 118\, no. 12 (2021): e2021768118.
\n[3] Day\
, Aaron M.\, Jonathan R. Dietz\, Madison Sutula\, Matthew Yeh\, and Ev
elyn L. Hu. "Laser writing of spin defects in nanophotonic cavities."
Nature Materials (2023): 1-7.
\n[4] Day\, Aaron M.\, Madison Sutu
la\, Jonathan R. Dietz\, Alexander Raun\, Denis D. Sukachev\, Mihir K.
Bhaskar\, and Evelyn L. Hu. "Electrical Manipulation of Telecom Color
Centers in Silicon." arXiv preprint arXiv:2311.08276 (2023).
This event starts at 3:30pm with refreshments\, followed at 3:45pm by a short presentation by Chengyu Fang (Mikhail Kats group)\, titled Scalable passive optical masks that enable one- and two-species atom- trap arrays”. The invited presentation starts at 4pm.
URL:https://www.physics.wisc.edu/events/?id=8669 END:VEVENT END:VCALENDAR