In the past few decades,quantum optics - the science of interaction between light and matter - has grown tremendously due to our ability to control individual atoms and atom-like systems. Quantum physicists can now use light to prepare, manipulate, and read out quantum states of atomic systems, as well as to 'entangle' distant quantum systems. This array of technological capabilities sets the stage for applications of this science in quantum-information processing and high-precision sensing. In this talk, he will give a general overview of their research on one such system - 'diamond color-centers', which are luminescent point-defects in diamond that function as artificial atoms. The spin-levels of these atoms can be used as a solid-state memory for quantum states, while their fluorescence can be used to interface this memory with light. In experiments, they embed these artificial atoms in nanoscale devices that they fabricate in diamond. These include nano-photonic devices such as photonic crystal cavities, and MEMS devices such as cantilevers. This approach allows us to dramatically enhance the interaction of these color-centers with light and mechanical vibrations, and hence efficiently interface them with photons and phonons. He will describe their recent experiments on this theme, and discuss two potential applications of such color-center devices -quantum communication, and magnetic-field sensing with nano-scale resolution.
Srujan Meesala is a PhD student in Applied Physics at the School of Engineering and Applied Sciences at Harvard University. He received his B. Tech. in Electrical Engineering from IIT Bombay in 2012. During his time at IIT-B, he worked on mid-infrared photodetectors based on III-V quantum dots with Prof. Subhananda Chakrabarti. His current research interests broadly lie in light-matter interaction, and in technological applications of quantum physics. His PhD research in the Laboratory for Nanoscale Optics with Prof. Marko Loncar at Harvard focuses on quantum optics with nanoscale devices, particularly on color-centers in diamond, and interfacing these with light for applications in quantum information science and sensing.