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Q: Fachverband Quantenoptik und Photonik

Q 80: Quantum Technologies – Color Centers III

Q 80.4: Vortrag

Freitag, 6. März 2026, 15:15–15:30, P 5

High-fidelity gates in a multi-qubit diamond quantum processor — •Margriet van Riggelen, Jiwon Yun, Hendrik Benjamin van Ommen, and Tim Hugo Taminiau — QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

Solid-state color centers are a promising platform exploring a range of quantum technologies such as distributed quantum computing and quantum communication. Examples using the nitrogen-vacancy center in diamond include the fault-tolerant operation of a logical qubit [1] and the creation of entanglement on a metropolitan scale [2]. To perform quantum error correction in future algorithms, high-quality quantum control will be needed. Recently, a high-fidelity two-qubit gate was demonstrated on an isolated two-qubit system in purified diamond [3]. However, high-fidelity quantum gates for a multiqubit register based on solid-state color centers have so far remained elusive.

Here, we demonstrate high-fidelity control of six nuclear spins surrounding a nitrogen-vacancy center in diamond using the dynamical decoupling radiofrequency gate. We characterize and benchmark the gates using gate set tomography and find an average of 99.18(2)% for the two-qubit gates in the register. We use the characterized gates in a variational quantum eigensolver algorithm to calculate the ground-state energy of molecular hydrogen and lithium hydride.

[1] Stolk, A.J. et al., Sci. Adv. 10 (2024) [2] Abobeih, M.H. et al., Nature 606 (2022) [3] Bartling, H.P. et al., Phys. Rev. App. 23 (2025)

Keywords: Nitrogen-vacancy (NV) center; High-fidelity quantum gates; Dynamical decoupling radiofrequency (DDRF) control; Characterization and benchmarking; Variational quantum eigensolver (VQE)