TEP Seminar - Hideaki Takashima

Solid-state materials hosting color centers have attracted significant attention in photonic quantum information science. Among them, tin-vacancy (SnV) centers in diamond have recently emerged as a promising platform owing to their high brightness, large zero-phonon line (ZPL) emission fraction (~60%), lifetime-limited optical linewidths, and long electronic spin coherence times at cryogenic temperatures. However, for practical quantum technological applications, efficient photon extraction from single SnV centers in diamonds remains a key challenge.

In this talk, we will present the development of two diamond-based platforms addressing this issue. The first approach focuses on incorporating single SnV centers into nanodiamonds, enabling efficient coupling to nanophotonic devices[1]. The second approach employs advanced nanofabrication techniques to realize diamond waveguides integrated with single SnV centers, aiming at enhanced photon extraction efficiency [2]. In addition, we will briefly introduce related studies using other solid-state quantum emitters.

[1] Takashima, Shimazaki, Abe, Ohshima, Takeuchi, ACS Photonics, 12, 9, 4950 (2025)

[2] Tieben, Rhensius, Segawa, Abe, Shimazaki, Takeuchi, Schell, Takashima, arXiv:2510.11285