【Date and Time】16-October-2026 2:00pm (Beijing time)

【Venue】Room 320 

【Host】Yan Liu (BAQIS)

【Title】Photo activation of shallow NV Centers in Diamond for Quantum Applications

【Speaker】  

Jens Fuhrmann is a PhD student in the Institute for Quantum Optics at Ulm University. His research focuses on the creation of color centers in diamond with a particular emphasis on low energy ion implantation for NV center creation. He is especially interested in improving shallow NV center properties at the diamond air interface and using them for sensing applications.He received his M.Sc. in Physics from Ulm University in 2022, where he worked on NV center characterization and noise spectroscopy.

【Abstract】

Negatively charged nitrogen-vacancy (NV-) centers in diamond are appealing for quantum sensing applications due to their environmental sensitivity and long coherence times. Precise and scalable shallow color center creation is essential yet challenging for technological quantum applications. This is due to the involvement of several lengthy processes, such as ion implantation and thermal annealing of the samples. The latter process can be addressed by application of an alternative activation technique that bypasses the high-temperature annealing. For this, nitrogen-implanted regions on a diamond substrate are exposed to continuous-wave 405nm laser radiation. The illumination leads to local activation of NV- centers with photoluminescence yield saturation for regions activated with laser power at around 800 μW. For low implantation doses, single NV- centers are created with corresponding mean T2 coherence time value around 71μs. The NV- creation yield for the lower implantation doses match conventional creation methods, while higher doses show reduced yield values. However, the coherent properties are comparable to NV- centers within annealed samples. This shows that the activated NV- centers are well-suited for advanced applications in quantum sensing and related technologies.