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Meesala, Srujan

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Meesala

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Srujan

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Meesala, Srujan

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2014 - 20183

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Author's Publications: search.filters.isAuthorOfPublication.582a4140-6c27-45a0-94bf-156b34a453a9

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Now showing 1 - 3 of 3
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    Novel fabrication of diamond nanophotonics coupled to single-photon detectors
    (SPIE-Intl Soc Optical Eng, 2017) Atikian, Haig; Meesala, Srujan; Burek, Michael; Sohn, Young-Ik; Israelian, Johan; Patri, Adarsh S.; Clarke, Nigel; Sipahigil, Alp; Evans, Ruffin; Sukachev, Denis; Westervelt, Robert; Lukin, Mikhail; Loncar, Marko
    Freestanding diamond nanostructures are etched from a bulk diamond substrate and integrated with evanescently coupled superconduncting nanowire single-photon detectors.
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    High quality-factor optical nanocavities in bulk single-crystal diamond
    (Nature Publishing Group, 2014) Burek, Michael; Chu, Yiwen; Liddy, Madelaine S. Z.; Patel, Parth; Rochman, Jake; Meesala, Srujan; Hong, Wooyoung; Quan, Qimin; Lukin, Mikhail; Loncar, Marko
    Single-crystal diamond, with its unique optical, mechanical and thermal properties, has emerged as a promising material with applications in classical and quantum optics. However, the lack of heteroepitaxial growth and scalable fabrication techniques remains the major limiting factors preventing more wide-spread development and application of diamond photonics. In this work, we overcome this difficulty by adapting angled-etching techniques, previously developed for realization of diamond nanomechanical resonators, to fabricate racetrack resonators and photonic crystal cavities in bulk single-crystal diamond. Our devices feature large optical quality factors, in excess of 105, and operate over a wide wavelength range, spanning visible and telecom. These newly developed high-Q diamond optical nanocavities open the door for a wealth of applications, ranging from nonlinear optics and chemical sensing, to quantum information processing and cavity optomechanics.
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    Controlling the coherence of a diamond spin qubit through its strain environment
    (Nature Publishing Group UK, 2018) Sohn, Young-Ik; Meesala, Srujan; Pingault, Benjamin; Atikian, Haig; Holzgrafe, Jeffrey; Gündoğan, Mustafa; Stavrakas, Camille; Stanley, Megan J.; Sipahigil, Alp; Choi, Joonhee; Zhang, Mian; Pacheco, Jose L.; Abraham, John; Bielejec, Edward; Lukin, Mikhail; Atatüre, Mete; Loncar, Marko
    The uncontrolled interaction of a quantum system with its environment is detrimental for quantum coherence. For quantum bits in the solid state, decoherence from thermal vibrations of the surrounding lattice can typically only be suppressed by lowering the temperature of operation. Here, we use a nano-electro-mechanical system to mitigate the effect of thermal phonons on a spin qubit – the silicon-vacancy colour centre in diamond – without changing the system temperature. By controlling the strain environment of the colour centre, we tune its electronic levels to probe, control, and eventually suppress the interaction of its spin with the thermal bath. Strain control provides both large tunability of the optical transitions and significantly improved spin coherence. Finally, our findings indicate the possibility to achieve strong coupling between the silicon-vacancy spin and single phonons, which can lead to the realisation of phonon-mediated quantum gates and nonlinear quantum phononics.