论文标题
晶体中的过渡金属离子集合作为固态相干自旋 - 光子界面：氧化镁镍的情况
Transition metal ion ensembles in crystals as solid-state coherent spin-photon interfaces: The case of nickel in magnesium oxide
论文作者
论文摘要
我们提供了一般指南，以查找固态系统，这些系统即使在相对较高的温度下也可以用作连贯的电子自旋式界面，那里的声子很丰富，但冷却更容易，并表明各种晶体中的过渡金属离子可以遵守这些准则。作为一个说明性的例子，我们专注于氧化镁中的二价镍离子。我们对这些离子的致密集合进行电子自旋谐振光谱和对极化敏感的磁光荧光光谱法，并发现（i）（i）基地电子自旋在几种微秒的液体温度下保持一致的连贯性，并且在几个微秒内，（ii）在有能量良好的旋转状态下，偶发性的旋转状态，偶发性地旋转式旋转状态，以循环为基础，以偶发性旋转的状态，以循环为基础，以循环为基础，以循环为基础，并且是偶发的旋转状态。极化。后者意味着对电子自旋的快速，连贯的光学控制是可能的。然后，我们提出了使用偏振光脉冲的光学初始化和控制地面电子自旋的方案，以及在该材料系统中接近telecom波长下实现无噪声的，无噪声的宽带量子 - 光学记忆的方案。
We present general guidelines for finding solid-state systems that could serve as coherent electron spin-photon interfaces even at relatively high temperatures, where phonons are abundant but cooling is easier, and show that transition metal ions in various crystals could comply with these guidelines. As an illustrative example, we focus on divalent nickel ions in magnesium oxide. We perform electron spin resonance spectroscopy and polarization-sensitive magneto-optical fluorescence spectroscopy of a dense ensemble of these ions and find that (i) the ground-state electron spin stays coherent at liquid-helium temperatures for several microseconds, and (ii) there exists energetically well-isolated excited states which can couple to two ground state spin sub-levels via optical transitions of orthogonal polarizations. The latter implies that fast, coherent optical control over the electron spin is possible. We then propose schemes for optical initialization and control of the ground-state electron spin using polarized optical pulses, as well as two schemes for implementing a noise-free, broadband quantum-optical memory at near-telecom wavelengths in this material system.
