Polarization-dependent optical properties of Ce-implanted Mg₂SiO₄

Since the solid-state spin qubit’s performance depends highly on its host material [1,2], in previous work, we have investigated the spin centers in an oxide (MgAl₂O₄) and suggested its Ce³⁺ center’s optically accessible spin properties [3]. Here, based on the theoretical predictions of the long coherence times [4], we investigate the Ce³⁺ center in forsterite (Mg₂SiO₄).

We implant the Ce ion into the forsterite substrate with the implantation dose and power of 1.0×10¹⁴ cm^-2 and 100 keV, respectively. We measure polarization-dependent optical properties of the sample annealed at 700^oC. The degree of circular polarization reaches 18%(24%) at 10 K with 0 mT(500 mT). This suggests the Ce center in forsterite is similar to the Ce³⁺ in YAG[5]; in this system, the 5d-4f transition of Ce³⁺ enables the optical initialization and readout of the spin qubit.



[1] P. Neumann et al., Science 320, 5881 (2008).

[2] W. F. Kohel et al., Nature 479, 84 (2011).

[3] M. Kawahara et al., Appl. Phys. Express 17, 072004 (2024).

[4] S. Kanai et al., Proc. Natl. Acad. Sci. 119, e2121808119 (2022).

[5] P. Liang et al., Phys. Rev. B 99, 024308 (2019).