Quantum 2025 – scientific programme
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THU: Thursday Contributed Sessions
THU 5: QIP Implementations: Interfaces
THU 5.4: Talk
Thursday, September 11, 2025, 15:00–15:15, ZHG006
Large-scale Localization of Diamond Color Centers for Deterministic Fabrication of Nanophotonic Spin-Photon Interfaces — •Maarten H. van der Hoeven1, Julian M. Bopp1,2, Marco E. Stucki1,2, Tommaso Pregnolato1,2, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
Quantum photonic circuits are fundamental building blocks for quantum information applications. Over the past decades, it has been demonstrated that color centers in diamond have excellent properties to serve as qubits in such systems [1]. To create an efficient spin-photon interface, the color centers have to be coupled to nanostructures. Achieving scalable fabrication of such devices with high yield and optimal performance requires deterministic fabrication techniques [2]. In this work, we use a widefield fluorescence microscope to localize tens of color centers per image frame and thousands across a diamond chip with uncertainties of just a few tens of nanometers. We then characterize all emitters and deterministically fabricate nanostructures at their positions. Our results show a device placement with high accuracy and precision. This makes it a powerful tool for the scalable and efficient integration of photonic spin qubits into quantum circuits.
[1] M. Ruf et al., Journal of Applied Physics 130, 070901 (2021)
[2] S. Rodt et al., J. Phys: Condensed Matter 32, 153003 (2020)
Keywords: Diamond Color Centers; Spin-Photon Interface; Integrated Photonics; Deterministic Fabrication; Quantum Devices