Optical quantum nondemolition measurement of a single rare earth ion qubit
Optical quantum nondemolition measurement of a single rare earth ion qubit
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DOI：
10.1038/s41467-020-15138-7
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发表时间：
2020-03-30
影响因子：
16.6
通讯作者：
Thompson, Jeff D.
中科院分区：
文献类型：
--
作者：
Raha, Mouktik;Chen, Songtao;Thompson, Jeff D.
固态中的光学界面自旋是量子技术的一个有前途的平台。这些系统的一个关键组成部分是对自旋状态的高保真投影测量。在这里，我们展示了一个单一的稀土离子量子位，Er 3+，这是有吸引力的电信波长的光学跃迁和硅纳米光子电路的兼容性的单次自旋读出。在以前的工作与激光冷却的原子和离子，和固态缺陷，自旋读出是使用荧光的光学循环过渡;然而，Er 3+和其他稀土离子一般缺乏强循环过渡。我们证明，修改离子周围的电磁环境可以增加几个数量级的光学跃迁的强度和周期性，使单次量子非破坏读出的离子的自旋与94.6%的保真度。我们用这个读数来探测自旋的相干动力学和弛豫。
Optically-interfaced spins in the solid state are a promising platform for quantum technologies. A crucial component of these systems is high-fidelity, projective measurement of the spin state. Here, we demonstrate single-shot spin readout of a single rare earth ion qubit, Er3+, which is attractive for its telecom-wavelength optical transition and compatibility with silicon nanophotonic circuits. In previous work with laser-cooled atoms and ions, and solid-state defects, spin readout is accomplished using fluorescence on an optical cycling transition; however, Er3+ and other rare earth ions generally lack strong cycling transitions. We demonstrate that modifying the electromagnetic environment around the ion can increase the strength and cyclicity of the optical transition by several orders of magnitude, enabling single-shot quantum nondemolition readout of the ion's spin with 94.6% fidelity. We use this readout to probe coherent dynamics and relaxation of the spin.