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Optically Stable Spin-Photon Interfaces in Diamond

This workshop explores the optically stable spin-photon interfaces in diamond, their motivations, challenges, and potential applications in quantum transduction. It discusses the long-lived spin coherence, scalable semiconductor nanofabrication, and the inefficient spin-photon interface, among other related topics.

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Optically Stable Spin-Photon Interfaces in Diamond

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  1. Optically Stable Spin-Photon Interfaces in Diamond Matt Trusheim IQINET Quantum Transduction Workshop 9/21/18

  2. H. J. Kimble Nature 2008 NV centers for quantum networks Motivations Challenges • Long-lived, controllable spin coherence • Spin to indistinguishable photon interface • Scalability • ‘Naturally trapped ion’ • Semiconductor nanofabrication • Inefficient spin-photon interface • 97% of emission uncorrelated • Low photon collection efficiency • Emission not at telecom • Spectral diffusion Y Chen et. al. Nat Photon, 2016 Mouradian et al. PRX 2015 Li et al. Nat. Comm. 2015 See: Hanson, Wrachtrup, Lukin, Awschalom, others! Mouradian et al CLEO 2018 Y Chen et. al. Nat Photon, 2016

  3. Optically stable color centers in diamond Inversion symmetry Bonus - FIB implantation Narrow spectral lines in structures Silicon-Vacancy Evans et al PR Applied 2016 Germanium-Vacancy 500 nm 3 Schröderet al. Nat. Comm. 2017. Bhaskar et al PRL 2017

  4. Spin dephasing in optically-stable centers Single-phonon scattering causes orbital flips Iwasaki PRL 2017 Siyushev PRB 2017 Meesala PRB 2018 Sukachev PRL 2017 Pingault Nat. Comm. 2017 ~ 100 ns-1 for SiV, ΔGS = 50 GHz @ 4 K Sukachev PRL 2017, Jahnke NJP 2014

  5. PbV center - density functional theory calculations Crystal Structure Orbital energies ZPL ~ 540 nm ΔGS ~ 6 THz Collaboration with P. Narang, Harvard See also Thering, Gali ArXiV1804.07004 M. Trusheim, N. Wan, K. Chen et al, under review

  6. 4 𝝻m Pb-related centers: experimental investigation Patterned Diamond Confocal Scan Nanopillar Fabrication Implanted Diamond PL 1 𝝻m Single emitter isolated! Details - Wan et al. APL 2018 M. Trusheim, N. Wan, K. Chen et al, under review

  7. Pb-related single emitter spectra Other representative spectra Pb-Nanopost Spectrum; 450 nm Excitation BG-corrected g(2)(0), region I, II: 0.28

  8. Pb-related inhomogeneous spectra Doublet observed around 520 nm ~ 5.7 THz splitting!

  9. Other charge states? Fluorescence spectra under 532 nm illumination Large dist. enables super-resolution arXiv:1805.06884 Towards neutral centers Towards dipole-dipole coupling

  10. Conclusion and Future Work • Quantum emission from Pb-related defects • Matches PbV theory • Orbital splitting allows spin coherence • New centers are promising • Rich area for experiment • Spin and quantum applications • Towards a single spin-photon interface • Coupling to other degrees of freedom • Nuclei • Strain • Spin-orbit helpful? FIB Periodic Table 1 𝝻m 10 Bischoff, L. et al. Applied Physics Reviews 2016

  11. Acknowledgements • Prof. Dirk Englund • Chris Ciccarino and Prof. Prineha Narang, Harvard • QP Group @ MIT • IC Postdoctoral Fellowship

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