Preprint

FZJ-2026-02232

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optimal Two-Qubit Gates for Group-IV Color-Centers in Diamond

Frey, J.FZJ* ; Senkalla, K. ; Vetter, P. J. ; Jelezko, F. ; Wilhelm, F. K. ; Müller, M.FZJ*

2026
arXiv

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Please use a persistent id in citations: doi:10.48550/ARXIV.2604.11340

Report No.: 2604.11340

Abstract: Color centers associated with group-IV dopants in diamond with long-lived nuclear spins have emerged as major candidates for distributed quantum computing nodes and quantum repeaters. Several proof-of-principle experiments have already been demonstrated. A key operation for long-distance entanglement-distribution protocols are fast and robust gates between the electron spin and a nuclear spin. Here, we investigate numerically for an existing experimental platform of a Germanium-vacancy (GeV) center with a strongly-coupled ${}^{13}$C spin, how such gates can be implemented via quantum optimal control. In the presence of realistic noise we investigate different parameter regimes and gate operations and obtain robust two-qubit gates with fidelities exceeding $99.9 \%$. The framework provides a scalable strategy for group-IV quantum nodes and can be adapted to related architectures.

Keyword(s): Quantum Physics (quant-ph) ; FOS: Physical sciences

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Contributing Institute(s):

1. Quantum Computing Analytics (PGI-12)
2. Quantum Control (PGI-8)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)
2. ASPIRE - Advancing Subseasonal PredIctions at Reduced computational Effort (101077260) (101077260)
3. AIDAS - Joint Virtual Laboratory for AI, Data Analytics and Scalable Simulation (aidas_20200731) (aidas_20200731)
4. SPINUS - Spin based quantum computer and simulator (101135699) (101135699)
5. OpenSuperQPlus100 - Open Superconducting Quantum Computers (OpenSuperQPlus) (101113946) (101113946)

Appears in the scientific report 2026

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