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New: Optical seminar

Tomasz Jakubczyk
(University of Basel and University of Warsaw)

Thursday, July 1st, 2021 at 9:30 am

Zoom link: https://smartvisio2.neel.cnrs.fr/b/flo-ivm-y7c

Title: « Creating low charge-noise nitrogen-vacancy centers in diamond »

Abstract: The negatively charged nitrogen-vacancy (NV) center in diamond is among the most promising solid-state systems implementations of a quantum bit. However, its poor single-photon emission characteristics requires integration of the NV center into a photonic environment and hence microstructuring the diamond at below-micrometer scale. Preserving the low NV zero-phonon line inhomogeneous broadening during this process is a major challenge with standard NV creation methods. This issue severely limits practical applications of NV centers.

I will present our recent attempts at the University of Basel to identify the sources and mitigate the charge-noise problem negatively impacting NV centers.   Among others, we employed laser writing [1] and implantation of N14 and N15 isotopes [2], all giving new insights into the problem and allowing us to improve the quality of the resulting NVs.

Finally, I will discuss our progress in improving the figures of merit of an open cavity hosting thin diamond samples and operating in a previously rather unexplored regime where the vacuum electric field is strongly confined to the diamond membrane.

[1] V. Yurgens, J.A Zuber, S. Flågan, M. De Luca, B.J. Shields, I. Zardo, P. Maletinsky, R.J. Warburton, and T. Jakubczyk, (2021) ACS Photonics (in press)
[2] M. Kasperczyk, J.A. Zuber, A. Barfuss, J. Kölbl, V. Yurgens, S. Flågan, T. Jakubczyk, B. Shields, R.J. Warburton, and P. Maletinsky,  (2020) Physical Review B102(7)
[3] S. Flågan, D. Riedel, A. Javadi, T. Jakubczyk, P. Maletinsky, and R.J. Warburton (2021) arXiv:2105.08736