2024/01/31 by Chris Adambukulam, Adambukulam, C., John A. Scott +9
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Laser-Matter Interactions and Applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum optics and atomic interactions
paper · pdf · doi:10.48550/arxiv.2402.00244
openalex publication_date 2024/01/31 · openalex created_date 2024/02/03 · openalex updated_date 2026/07/28
The germanium vacancy in diamond (GeV) is a promising candidate for color center based quantum networking. Yet, like for other group-IV vacancy defects in diamond, achieving fast, high-fidelity qubit operations using traditional magnetic resonance techniques is experimentally challenging due to a weak magnetic dipole and susceptibility to thermally induced decoherence. Here, we perform all-optical control of the GeV and realize Rabi frequencies exceeding ∼ 20~MHz. We do so by driving the two Λ-systems of the GeV simultaneously and apply this to probe the spin coherence (T2^*=224±14~ns, T2\rm H=11.9±0.3~μs). Our control scheme is applicable to other color centers and particularly, other group-IV defects for which, the scheme may be optimized to improve all-optical control in these systems.