ROSE optical memory protocol in the waveguide of a Tm : YAG crystal

In this work, optical spectroscopy of thulium ions in a single-mode optical waveguide fabricated in a Tm$^{3+}$ : Y$_3$Al$_5$O$_{12}$ crystal using the femtosecond laser printing method was carried out and an optical quantum memory protocol was demonstrated in a revival of silenced echo scheme. An analysis of the experimental data indicates the presence of instantaneous spectral diffusion at a thulium ion concentration of less than 0.01%, a weak effect of imperfections in the formed waveguide on the lifetime of the optical memory, and indicates the possibility of achieving a high efficiency of input signal recovery in the implemented waveguide scheme of the protocol.