Properties of a rare-earth-ion-doped waveguide at sub-Kelvin temperatures for quantum signal processing

Neil Sinclair, Daniel Oblak, Charles W. Thiel +2

We characterize the 795 nm ${}^3$H${}_6$ to ${}^3$H${}_4$ transition of Tm${}^{3+}$ in a Ti${}^{4+}$:LiNbO${}_3$ waveguide at temperatures as low as 800 mK. Coherence and hyperfine population…