Young-Ik Sohn*, Srujan Meesala*, Benjamin Pingault*, Haig A. Atikian, Jeffrey Holzgrafe, Mustafa Gündoğan, Camille Stavrakas, Megan J. Stanley, Alp Sipahigil, Joonhee Choi, Mian Zhang, Jose L. Pacheco, John Abraham, Edward Bielejec, Mikhail D. Lukin, Mete Atatüre, and Marko Lončar. Submitted. “
Engineering a diamond spin-qubit with a nano-electro-mechanical system.” arXiv:1706.03881.
arXiv Version Abstract The realisation of a distributed quantum network requires long-lived memory qubits such as electron spins efficiently interfaced with indistinguishable optical photons. Due to dynamic fluctuations in the solid-state environment, it remains a challenge to identify a solid-state emitter that simultaneously offers excellent optical properties and long-lived qubit coherence. Specifically, the impact of thermal phonons is irreversible, and fundamentally limits qubit coherence. Here, we employ silicon-vacancy (SiV) colour centres in diamond, known for their excellent optical properties, and demonstrate an approach to improve their phonon-limited spin coherence. Using a diamond nano-electro-mechanical system (NEMS), we control the SiV electronic structure by tuning strain, allowing us to both probe and quench the interaction of the colour centre with phonons. This approach also provides a scalable platform to overcome optical inhomogeneity among emitters. The large wavelength tunability and improved spin coherence that we demonstrate make the SiV an attractive platform for the realisation of a quantum network.
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