Reliable coherent optical memory based on a laser-written waveguide

• URL: http://arxiv.org/abs/2002.08780v1
• Date: Thu, 20 Feb 2020 14:57:37 GMT
• Title: Reliable coherent optical memory based on a laser-written waveguide
• Authors: Chao Liu, Zong-Quan Zhou, Tian-Xiang Zhu, Liang Zheng, Ming Jin, Xiao Liu, Pei-Yun Li, Jian-Yin Huang, Yu Ma, Tao Tu, Tian-Shu Yang, Chuan-Feng Li, and Guang-Can Guo
• Abstract summary: We report the fabrication of type 2 waveguides in a $mathrm 151Eu3+:YSiO_5$ crystal using femto-laser micromachining. The resulting waveguides are compatible with single-mode fibers and have the smallest insertion loss of $4.95 dB$. On-demand light storage is demonstrated in a waveguide by employing the spin-wave atomic frequency comb (AFC) scheme and the revival of silenced echo (ROSE) scheme.
• Score: 18.9011015272931
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: $\mathrm {^{151}Eu^{3+}}$-doped yttrium silicate ($\mathrm {^{151}Eu^{3+}:Y_2SiO_5}$ ) crystal is a unique material that possesses hyperfine states with coherence time up to 6 h. Many efforts have been devoted to the development of this material as optical quantum memories based on the bulk crystals, but integrable structures (such as optical waveguides) that can promote $\mathrm {^{151}Eu^{3+}:Y_2SiO_5}$-based quantum memories to practical applications, have not been demonstrated so far. Here we report the fabrication of type 2 waveguides in a $\mathrm {^{151}Eu^{3+}:Y_2SiO_5}$ crystal using femtosecond-laser micromachining. The resulting waveguides are compatible with single-mode fibers and have the smallest insertion loss of $4.95\ dB$. On-demand light storage is demonstrated in a waveguide by employing the spin-wave atomic frequency comb (AFC) scheme and the revival of silenced echo (ROSE) scheme. We implement a series of interference experiments based on these two schemes to characterize the storage fidelity. Interference visibility of the readout pulse is $0.99\pm 0.03$ for the spin-wave AFC scheme and $0.97\pm 0.02$ for the ROSE scheme, demonstrating the reliability of the integrated optical memory.

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