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Reliable coherent optical memory based on a laser-written waveguide
Optica ( IF 10.4 ) Pub Date : 2020-02-20 , DOI: 10.1364/optica.379166
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 , Guang-Can Guo

$ ^{{151}}{{\rm Eu}^{{3} + }} $-doped yttrium silicate ($ {^{{151}}{{\rm Eu}}^{{3} + }}:{{\rm Y}_{2}}{{\rm SiO}_{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 bulk crystals, but integrable structures (such as optical waveguides) that can promote $ {^{{151}}{{\rm Eu}}^{{3} + }}:{{\rm Y}_{2}}{{\rm SiO}_{5}} $-based quantum memories to practical applications have not been demonstrated so far. Here we report the fabrication of type II waveguides in a $ {^{{151}}{{\rm Eu}^{{3} }+ }}:{{\rm Y}_{2}}{{\rm SiO}_{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.

中文翻译:

基于激光写入波导的可靠相干光存储器

$ ^ {{{151}} {{\ rm Eu} ^ {{3} +}} $掺杂硅酸钇($ {^ {{{151}} {{\ rm Eu}} ^ {{3} +}} :{{\ rm Y} _ {2}} {{\ rm SiO} _ {5}} $)晶体是一种独特的材料,具有超细态,相干时间长达6 h。人们已经为开发这种材料作为基于块状晶体的光量子存储器而做出了很多努力,但是这种可集成结构(例如光波导)可以促进$ {^ {{151}} {{\ rm Eu}} ^ {{ 3} +}}:{{\ rm Y} _ {2}} {{\ rm SiO} _ {5}}基于$的量子存储器至今仍未得到证明。在这里,我们以$ {^ {{151}} {{\ rm Eu} ^ {{3}} +}}:{{\ rm Y} _ {2}} {{\ rm SiO} _ {5}} $飞秒激光微加工制造晶体。所得的波导与单模光纤兼容,插入损耗最小,为4.95 dB。通过使用自旋波原子频率梳(AFC)方案和恢复无声回波(ROSE)方案,在波导中显示了按需存储光。我们基于这两种方案实施了一系列干扰实验,以表征存储保真度。对于自旋波AFC方案,读出脉冲的干扰可见度为$ 0.99 \ pm 0.03 $,而对于ROSE方案为$ 0.97 \ pm 0.02 $,证明了集成光学存储器的可靠性。
更新日期:2020-02-20
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