Title：Phonon Networks with Silicon-Vacancy Centers in Diamond Waveguides
Time：10:30 a.m., November 27,2019
Location：818 Conference Room
Dr. Marc-Antoine Lemonde is a senior postdoctoral research in quantum technologies with a background in quantum optomechanics and expertises in quantum hybrid systems. Now he works in the Centre for Quantum Technologies, National University of Singapore. And his research interests are abroad, including quantum optics, quantum information processing in solid-state systems, quantum simulation of many-body physics, topological phases of matter and quantum variational algorithms for near-term quantum processors. More recently, he has been looking at classical machine learning techniques applied to quantum mechanics.
I will present a novel realization of a solid-state quantum network, where separated silicon-vacancy centers are coupled via the phonon modes of a diamond structure. In our approach, quantum states encoded in long-lived electronic spin states can be converted into propagating phonon wavepackets and be reabsorbed efficiently by a distant defect center. I will first present the case of a quasi 1D crystal waveguide, where multiple (and non-chiral) phonon modes contribute to the state transfer. I will then present a more involved platform of a 2D array of optomechanical cavities, in which the phononic state transfer is performed via a chiral, single mode, topological edge state. Our analysis shows that under realistic conditions, this approach enables the implementation of high-fidelity, scalable quantum communication protocols within chip-scale spin-qubit networks. Apart from quantum information processing, these setups constitute a novel waveguide QED platform, where strong-coupling effects between solid-state defects and individual propagating phonons can be explored at the quantum level, as well as nonlinear physics in topological systems.