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Q: Fachverband Quantenoptik und Photonik
Q 80: Quantum Technologies – Color Centers III
Q 80.6: Talk
Friday, March 6, 2026, 15:45–16:00, P 5
Coherent Control of a Coupled Three-Electron Spin Quantum Register in Diamond — •Fabian Müller1, Tobias Spohn1, Philipp J. Vetter1, Timo Joas1, Samuele Brambilla1, Florian Ferlemann2, René Wolters2, Tommaso Calarco2, Matthias M. Müller2, Shinobu Onoda3, and Fedor Jelezko1 — 1Institute for Quantum Optics, Ulm University, D-89081 Ulm, Germany — 2Peter Grünberg Institute-Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 3Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology (QST), Takasaki, Gunma 370-1292, Japan
High-fidelity gates between coupled electron spins at room temperature were recently demonstrated using molecularly implanted nitrogen-vacancy (NV) centers in diamond. In addition to NV centers, the implantation process can also create dark spins, providing further scalability for the system.
In this work, we characterize a coupled NV–NV pair and a nearby dark spin (a P1 center) that together form a three-electron spin quantum register at room temperature. We demonstrate coherent interactions among all three spins and probe their coherence properties.
Controlling the P1 center at room temperature is challenging due to the strong hyperfine interaction between its electron and nuclear spin. We present methods such as DEER spectroscopy and double-channel PulsePol to address, coherently control, and read out the P1 center using the nearby NV center. Our work expands the scalability of room-temperature electron spin quantum registers in diamond.
Keywords: nitrogen-vacancy center; P1 defect; DEER spectroscopy; room-temperature electron spin control; diamond quantum registers