IQIM Postdoctoral and Graduate Student Seminar

Abstract: In the past decade, color centers in diamond have become a leading platform for quantum networking experiments. The first demonstrations relied on the Nitrogen-Vacancy (NV) center, from the first loophole-free Bell test to multi-node network experiments. However, the NV center suffers from a low Debye-Waller factor and strong spectral diffusion close to surfaces, making its optical interface unsuited for scaling. Group-IV vacancy centers emerged as a favourable alternative due to their high Debye-Waller factor and inversion symmetry, resulting in first-order insensitivity to charge noise and thus compatibility with nanophotonic integration. Pioneering experiments showing basic network node operation in a dilution refrigerator have been performed using the silicon-vacancy (SiV) center in nanophotonic devices. More recently, the Tin-Vacancy (SnV) center in diamond has emerged as a new favorite of the community thanks to a higher quantum efficiency and significant spin-orbit coupling that allows for operation at elevated temperatures compared to the SiV center. I will discuss some recent SnV experiments in Delft, working towards using the center as a quantum network node.

Refreshments will be provided following the talk.