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<p>Rare earth ions (REI) in solid materials are among the leading systems for quantum technology applications. However, developing practical REI quantum devices with long-lived coherent states remains challenging due to great difficulties in growing high-quality REI materials and incomplete understanding of their decoherence mechanisms. In this work, we report a long optical coherence time of 422 &#xa0;± 11 <i>μ</i>s for the <sup>7</sup>F<sub>0</sub>&#xa0;→&#xa0;<sup>5</sup>D<sub>0</sub> transition, as well as a lifetime exceeding 30 hours for the <sup>7</sup>F<sub>0</sub> hyperfine spin states in Eu<sup>3+</sup>:Y<sub>2</sub>O<sub>3</sub> optical ceramics. We identify the absence of two-level-system induced optical decoherence in short-range-ordered crystals and a decoherence mechanism caused by perturbing magnetic centers that were not detected previously below 1.5 K. Furthermore, we demonstrate coherent light storage over 5 <i>μ</i>s by using the atomic frequency comb protocol. These results provide a promising proof-of-principle demonstration of quantum memory using Eu<sup>3+</sup>:Y<sub>2</sub>O<sub>3</sub> optical ceramic system, highlighting its significant potential for practical quantum applications.</p>

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Long-lived optical coherence and spin lifetimes in Eu3+:Y2O3 oxide ceramics for quantum memories

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月18日

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  • Shuping Liu,
  • Miaomiao Ren,
  • Wanting Xiao,
  • Jun Wang,
  • Yuting Liu,
  • Diana Serrano,
  • Philippe Goldner,
  • Dingyuan Tang,
  • Xiantong An,
  • Fudong Wang,
  • Manjin Zhong

摘要

Rare earth ions (REI) in solid materials are among the leading systems for quantum technology applications. However, developing practical REI quantum devices with long-lived coherent states remains challenging due to great difficulties in growing high-quality REI materials and incomplete understanding of their decoherence mechanisms. In this work, we report a long optical coherence time of 422  ± 11 μs for the 7F0 → 5D0 transition, as well as a lifetime exceeding 30 hours for the 7F0 hyperfine spin states in Eu3+:Y2O3 optical ceramics. We identify the absence of two-level-system induced optical decoherence in short-range-ordered crystals and a decoherence mechanism caused by perturbing magnetic centers that were not detected previously below 1.5 K. Furthermore, we demonstrate coherent light storage over 5 μs by using the atomic frequency comb protocol. These results provide a promising proof-of-principle demonstration of quantum memory using Eu3+:Y2O3 optical ceramic system, highlighting its significant potential for practical quantum applications.