Journal Article

FZJ-2025-03459

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High-Fidelity Electron Spin Gates for Scaling Diamond Quantum Registers

Joas, T. ; Ferlemann, F.FZJ* ; Sailer, R. ; Vetter, P. J. ; Zhang, J. ; Said, R. S. ; Teraji, T. ; Onoda, S. ; Calarco, T.FZJ* ; Genov, G. ; Müller, M. C. T. D. ; Jelezko, F.

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevX.15.021069  doi:10.34734/FZJ-2025-03459

Abstract: Diamond is a promising platform for quantum information processing as it can host highly coherent qubits that could allow for the construction of large quantum registers. A prerequisite for such devices is a coherent interaction between nitrogen-vacancy (NV) electron spins enabling scalable entanglement. Entanglement between dipolar-coupled NV spin pairs has been demonstrated but with a limited fidelity, and its error sources have not been characterized. Here, we design and implement a robust two-qubit gate between NV electron spins in diamond and quantify the influence of multiple error sources on the gate performance. Experimentally, we demonstrate a record gate fidelity of 𝐹2⁢q=(96.0±2.5)% under ambient conditions. Our identification of the dominant errors paves the way towards NV-NV gates beyond the error correction threshold.

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Contributing Institute(s):

1. Quantum Control (PGI-8)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)
2. SPINUS - Spin based quantum computer and simulator (101135699) (101135699)
3. BMBF 13N16210 - SPINNING – Spin-Photon-basierter Quantencomputer auf Diamantbasis (BMBF-13N16210) (BMBF-13N16210)

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