Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Nano-Optics (Single Quantum Emitters)
Q 43.6: Talk
Wednesday, March 7, 2018, 15:30–15:45, K 0.023
Resonant excitation studies of single dichroic vacancy centres in silicon carbide — Roland Nagy1, •Florian Kaiser1, Matthias Niethammer1, Matthias Widmann1, Durga Dasari1, Ilja Gerhardt1, Öney Soykal2, Nguyen Tien Son3, Christian Bonato4, Sang-Yun Lee5, and Jörg Wrachtrup1 — 13. Physikalisches Institut, Universität Stuttgart — 2Naval Research Laboratory, Washington, USA — 3Department of Physics, Chemistry and Biology, Linköping University, Sweden — 4IPAQS, SUPA, Edinburgh, UK — 5CGI, KIST, Seoul, Korea
Solid-state color centres are promising systems for scalable quantum information architectures. The ideal system meets three key features:
first, millisecond electron spin coherence times to permit quantum state manipulation and coupling to other spins; second, a large fraction of photons must be emitted in the zero phonon line to generate spin-photon entanglement; third, excellent spectral stability.
We show that all three criteria are met by the dichroic vacancy defect center (V1) in 4H-SiC [1]. The V1 center is a S=3/2 spin system with well-separated optical transitions at 861 nm [2]. We perform resonant optical excitation studies on single V1 centers to explore the ground and excited state level structures. We study also the spin dynamics and note that no spectral diffusion has been observed. Therefore, our results pave the way for a robust and scalable quantum information platform based on color centers in silicon carbide.
[1] R. Nagy et al., arxiv:1707.02715 (2017)
[2] M. Widmann et al., Nat. Mater. 14, 164 (2015)