Lingraj Kumar
Research Scholar @Université PSL
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WORK HISTORY
Research Scholar @Université PSL
Paris, FR
My doctoral research focuses on the synthesis and optimization of CVD-grown nanodiamonds incorporating Group-IV color centers (SiV, GeV, SnV) for quantum sensing applications under extreme conditions. The project combines diamond growth, defect engineering, and quantum optics to develop robust nanoscale sensors capable of operating at ultra-high pressures (>100 GPa) and in Tesla-range magnetic fields. A key objective is to understand defect incorporation mechanisms during plasma-assisted CVD and to enhance the optical performance of color centers through post-synthesis treatments, with in situ characterization at large-scale facilities such as synchrotrons. This work aims to enable reliable quantum sensors for high-pressure physics and related field
EDUCATION
Sambalpur University
Bachelor of Science - BS, Physics
Govt. Juior college Bhawanipatna
Intermediate, Science Stream
Rajivjee High School Gaigaon
High School degree
National Institute of Technology Warangal
Master of Science , Engineering Physics with Photonics specialisation
ABOUT LINGRAJ KUMAR
With a strong foundation in Engineering Physics and a specialization in Photonics from NIT Warangal, I am currently a Quantum Physicist at Università degli Studi di Firenze, working on cutting-edge quantum technologies. My expertise spans quantum optics, photonics, and quantum information processing, with a strong focus on experimental and computational techniques. At the University of Florence, I am actively involved in the development of a fiber-integrated optical tweezer for a compact ytterbium-based single-photon source in the telecom band. This project, part of ongoing efforts to advance quantum networks (QNs), leverages 3D direct laser writing (DLW) lithography to create a scalable photonic device on a fiber tip. Our approach aims to address key challenges in scalability, coherence, and portability, ultimately enabling the efficient generation of indistinguishable single photons for quantum communication. The optimization process involves advanced simulations using JCMsuite (finite element solver) and Zemax (ray optics solver) to control focal properties and maximize numerical aperture. Previously, as part of the EuroQCI Initiative, our team developed a graphical user interface (GUI) for quantum measurement of correlated photons, utilizing Python in a Jupyter notebook environment. This project strengthened my proficiency in modules like matplotlib, numpy, and tkinter, as well as my experience with hardware such as the Time Tagger Ultra. My research background also includes contributions to magnetic levitation of nanodiamonds containing NV centers (University of Warwick) and the development of an optical control and measurement system for a Rydberg atom array quantum processor. These experiences have reinforced my ability to bridge theoretical quantum physics with practical implementation. Beyond research, I am passionate about science communication and education. I create 3D animation videos on my YouTube channel, PhysicsOfThings, simplifying complex physics concepts for a broader audience. I believe in making quantum physics and photonics more accessible and engaging, fostering curiosity and innovation. I am fluent in English, Hindi, and Japanese and always open to collaborations in quantum optics, quantum computing, and photonic device engineering.Let’s connect and explore new possibilities in quantum technology and beyond!
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