# QI MASc Seminar Notice - Controlling Photon Emission from Nitrogen Vacancy Centers in Diamond

Wednesday, April 7, 2021 — 11:00 AM EDT

Candidate: Vinodh Raj Rajagopal Muthu

Title: Controlling Photon Emission from Nitrogen Vacancy Centers in Diamond

Date: April 7, 2021

Time: 11:00 AM

Place: Remote

Supervisor(s): Bajcsy, Michal

Abstract:

In this thesis we investigate two applications involving the control over the photonic emission from NV centers. In the first part of the thesis we will be exploring the design of a nanophotonic structure that would be able to control the directionality of photon emission from NV centers. The control over the emission of the NV centers paves the way for applications such as single photon sources and metrology. We will be using the inverse design methodology known as adjoint optimization to design the structure. Furthermore we will present FDTD simulations to assess the performance of the designed structure and compare its performance with existing structures. We then present some preliminary experimental results from a confocal microscopy setup we built in our lab.

In the second part of the thesis we investigate the potential of using single NV centers for photon conversion between the microwave and optical regimes. The conversion between the microwave photons, that couple to superconducting qubits, and optical photons, that are used in long range communication and memories, is an important component in realising an extended quantum network. In our proposed scheme explore the use of $\Lambda$ system in NV centers coupled to optical and microwave cavities for the efficient conversion between the microwave and optical regimes. We present analytical and numerical simulations to identify the required characteristics of the system to achieve high conversion efficiencies.

### June 2021

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