Preprint

FZJ-2025-01587

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Coherent Control of a Long-Lived Nuclear Memory Spin in a Germanium-Vacancy Multi-Qubit Node

Grimm, N. ; Senkalla, K. ; Vetter, P. J. ; Frey, J. (Corresponding author)FZJ* ; Gundlapalli, P. ; Calarco, T.FZJ* ; Genov, G. ; Müller, M.FZJ* ; Jelezko, F.

2024
arXiv

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Please use a persistent id in citations: doi:10.48550/ARXIV.2409.06313

Abstract: The ability to process and store information on surrounding nuclear spins is a major requirement for group-IV color center-based repeater nodes. We demonstrate coherent control of a ${}^{13}$C nuclear spin strongly coupled to a negatively charged germanium-vacancy center in diamond with coherence times beyond 2.5s at mK temperatures, which is the longest reported for group-IV defects. Detailed analysis allows us to model the system's dynamics, extract the coupling parameters, and characterize noise. We estimate an achievable memory time of 18.1s with heating limitations considered, paving the way to successful applications as a quantum repeater node.

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

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Contributing Institute(s):

1. Quantum Computing Analytics (PGI-12)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

Appears in the scientific report 2024

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