Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 72: Quantum Technologies – Color Centers II
Q 72.3: Talk
Friday, March 6, 2026, 11:30–11:45, P 5
High-Q 1D photonic crystal cavities for V2 color centers in 4H-SiC — •Anantha Krishnan1, Adil Han Dogan1, Timo Steidl1, Rainer Stöhr1, Wolfgang Knolle2, Misagh Ghezellou2, Jawad Ul-Hassan2, Vadim Vorobyov1, and Jörg Wrachtrup1,3 — 13rd Institute of Physics, University of Stuttgart — 2Department of Physics, Chemistry and Biology, Linköping University — 3Max Planck Institute for Solid State Research, Stuttgart, Germany
Scalable quantum networks rely on efficient spin photon interfaces. Existing platforms such as diamond or quantum dots offer high performance but often come with limitations in fabrication scalability or coherence properties. The V2 color center in 4H-SiC, emitting at 917 nm, combines long spin coherence with material and fabrication scalability, making it a compelling platform for integrated quantum nodes. In this work, we design high-Q 1D photonic crystal cavities to enhance the Zero-Phonon Line (ZPL) emission. Simulations of the optimized design predict a quality factor of Q ≈ 1.2 × 105 with a low mode volume, Vmode ≈ 1.3 (λ/n)3. To realize this performance in a scalable photonic architecture, we fabricate the devices using advanced nanofabrication methods, followed by the integration of 45∘ undercut couplers, enabling efficient vertical excitation and collection. Transmission spectroscopy reveals narrow resonance peaks, validating the optical design. Combining high-Q engineering with efficient light coupling, this platform offers a scalable route for spin-photon interfaces in quantum networks.
Keywords: 4H-SiC; Photonic Crystal Cavities; V2 Zero Phonon Line; Quantum Network