Analyzing the Rydberg-based optical-metastable-ground architecture for Yb171 nuclear spins
Analyzing the Rydberg-based optical-metastable-ground architecture for Yb171 nuclear spins
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DOI：
10.1103/physreva.105.052438
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发表时间：
2022-01
影响因子：
2.9
通讯作者：
Neville Chen;Lintao Li;W. Huie;Mingkun Zhao;Ian Vetter;C. Greene;J. Covey
中科院分区：
文献类型：
--
作者：
Neville Chen;Lintao Li;W. Huie;Mingkun Zhao;Ian Vetter;C. Greene;J. Covey
中性碱土(类)原子最近被用于原子阵列中，具有单独的读出、控制和高保真里德堡介导的纠缠。这一新兴平台提供了一系列新的量子科学应用，利用了这些原子的独特性质：超窄的光学“时钟”跃迁和孤立的核自旋。具体地说，这些性质提供了一个光学量子比特(“o”)以及基态(“g”)和亚稳态(“m”)核自旋量子比特，所有这些都在单个原子内。我们考虑了这种“omg”结构及其与Rydberg态的耦合产生纠缠的实验上的现实控制，特别关注了具有核自旋$i=1/2$的YtTb-171($^{171}\Text{Yb}$)。我们分析了由三个自旋1/2组分(两个电子和原子核)描述的{S}系列里德堡态。我们证实，$F=3/2$流形--一种独特的自旋构型--非常适合于纠缠核自旋量子比特。此外，我们使用多通道量子亏损理论分析了由两个重叠的自旋组态描述的$F=1/2$系列。研究了在Rabi频率分别为2 0 0 kHz和6 MHz时，驱动时钟或里德堡跃迁时核自旋态的多能级动力学，发现合适的磁场(约2 0 0，文本G)和合适的激光偏振强度纯度(约0.99)足以使栅保真度大于0.99。
Neutral alkaline earth(-like) atoms have recently been employed in atomic arrays with individual readout, control, and high-fidelity Rydberg-mediated entanglement. This emerging platform offers a wide range of new quantum science applications that leverage the unique properties of such atoms: ultra-narrow optical"clock"transitions and isolated nuclear spins. Specifically, these properties offer an optical qubit ("o") as well as ground ("g") and metastable ("m") nuclear spin qubits, all within a single atom. We consider experimentally realistic control of this"omg"architecture and its coupling to Rydberg states for entanglement generation, focusing specifically on ytterbium-171 ($^{171}\text{Yb}$) with nuclear spin $I = 1/2$. We analyze the $S$-series Rydberg states of $^{171}\text{Yb}$, described by the three spin-$1/2$ constituents (two electrons and the nucleus). We confirm that the $F = 3/2$ manifold -- a unique spin configuration -- is well suited for entangling nuclear spin qubits. Further, we analyze the $F = 1/2$ series -- described by two overlapping spin configurations -- using a multichannel quantum defect theory. We study the multilevel dynamics of the nuclear spin states when driving the clock or Rydberg transition with Rabi frequency $\Omega_\text{c} = 2 \pi \times 200$ kHz or $\Omega_\text{R} = 2 \pi \times 6$ MHz, respectively, finding that a modest magnetic field ($\approx200\,\text{G}$) and feasible laser polarization intensity purity ($\lesssim0.99$) are sufficient for gate fidelities exceeding 0.99.