硅酸钇中2位镨离子的超精细相互作用和相干时间
Hyperfine interaction and coherence time of praseodymium ions at the site 2 in yttrium orthosilicate
摘要：
掺杂在硅酸钇（Y $_2$ SiO $_5$）1位的镨（Pr $^{3+}$）离子由于其优异的光学相干性和自旋相干性而被广泛用作光子量子存储器。而占据Y $_2$ SiO $_5$晶体中位置2的镨离子与位置1的镨离子相比具有更好的光学相干性，这可以实现更好的量子存储性能。在这里，我们用拉曼外差探测的核磁共振实验表征了Pr $^{3+}$在Y $_2$ SiO $_5$中2位的基态$^3$ H $_4$和激发态$^1$ D $_2$的超精细相互作用。基于201个磁场中的Raman外差谱，重建了基态$^3$ H $_4$和激发态$^1$ D $_2$的超精细相互作用的哈密顿量.在零磁场条件下，基态的双脉冲自旋回波相干寿命为2.6 $\pm$ ± 0.1 ms，是1号位的5倍多.确定了Pr $^{3+}$在Y $_2$ SiO $_5$中2位超精细跃迁中一级塞曼位移为零的磁场。
英文摘要：
Praseodymium (Pr$^{3+}$) ions doped in the site 1 of yttrium orthosilicate (Y$_2$SiO$_5$) has been widely employed as the photonic quantum memory due to their excellent optical coherence and spin coherence. While praseodymium ions occupying the site 2 in Y$_2$SiO$_5$ crystal have better optical coherence as compared with those at site 1, which may enable better performance in quantum memory. Here we experimentally characterize the hyperfine interactions of the ground state $^3$H$_4$ and excited state $^1$D$_2$ of Pr$^{3+}$ at site 2 in Y$_2$SiO$_5$ using Raman heterodyne detected nuclear magnetic resonance. The Hamiltonians for the hyperfine interaction are reconstructed for both ground state $^3$H$_4$ and excited state $^1$D$_2$ based on the Raman heterodyne spectra in 201 magnetic fields. The two-pulse spin-echo coherence lifetime for the ground state is measured to be 2.6$\pm$0.1 ms at site 2 with zero magnetic field, which is more than five times longer than that at site 1. The magnetic fields with zero first order Zeeman shift in the hyperfine transition for Pr$^{3+}$ at site 2 in Y$_2$SiO$_5$ are identified.
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