High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface

• URL: http://arxiv.org/abs/2505.09267v1
• Date: Wed, 14 May 2025 10:36:22 GMT
• Title: High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface
• Authors: Isaac B. W. Harris, Ian Christen, Sofia M. Patomäki, Hamza Raniwala, Maxim Sirotin, Marco Colangelo, Kevin C. Chen, Carlos Errando-Herranz, David J. Starling, Ryan Murphy, Katia Shtyrkova, Owen Medeiros, Matthew E. Trusheim, Karl K. Berggren, P. Benjamin Dixon, Dirk Englund,
• Abstract summary: Group-IV color centers in diamond (SiV, GeV, and SnV) are promising candidates for long distance quantum networking.<n>Recent work has demonstrated state-of-the-art performance in spin-photon coupling and spin-spin entanglement.<n>We propose using the large hyperfine coupling of SnV-117 to operate the device at zero magnetic field in a regime where the memory is insensitive to optical excitation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Long distance quantum networking requires combining efficient spin-photon interfaces with long-lived local memories. Group-IV color centers in diamond (SiV, GeV, and SnV) are promising candidates for this application, containing an electronic spin-photon interface and dopant nuclear spin memory. Recent work has demonstrated state-of-the-art performance in spin-photon coupling and spin-spin entanglement. However, coupling between the electron and nuclear spins introduces a phase kickback during optical excitation that limits the utility of the nuclear memory. Here, we propose using the large hyperfine coupling of SnV-117 to operate the device at zero magnetic field in a regime where the memory is insensitive to optical excitation. We further demonstrate ground state spin control of a SnV-117 color center integrated in a photonic integrated circuit, showing 97.8% gate fidelity and 2.5 ms coherence time for the memory spin level. This shows the viability of the zero-field protocol for high fidelity operation, and lays the groundwork for building quantum network nodes with SnV-117 devices.

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