Dynamical topological phase realized in a trapped-ion quantum simulator
Dynamical topological phase realized in a trapped-ion quantum simulator
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DOI：
10.1038/s41586-022-04853-4
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发表时间：
2022-07-21
期刊：
影响因子：
64.8
通讯作者：
Potter, Andrew C.
中科院分区：
文献类型：
--
作者：
Dumitrescu, Philipp T.;Bohnet, Justin G.;Potter, Andrew C.
可编程量子模拟的新生平台提供了前所未有的机会，可以在几乎孤立的系统中获得远离平衡的量子多体动力学的新机制。在这里，实现对量子多体纠缠的精确控制是量子传感和计算的一项重要任务。广泛的理论工作表明，这些能力可以使动力学阶段和关键现象，显示拓扑鲁棒的方法来创建，保护和操纵量子纠缠，自我纠正对大类错误。然而，到目前为止，实验实现仅限于经典（非纠缠）的破缺阶数（1-5）。在这项工作中，我们在Quantinuum系统模型H1捕获离子量子处理器（7）中的十个Yb-171（+）超精细量子位的准周期驱动阵列中展示了一个新出现的动态对称保护拓扑相（6）。这个阶段显示了边缘量子位，它们受到动态保护，免受控制错误、串扰和杂散场的影响。至关重要的是，这种边缘保护完全依赖于对一般相干扰动绝对稳定的涌现动力学对称性。这个属性是特殊的准周期驱动系统：正如我们所证明的，类似的边缘状态的周期性驱动的量子比特阵列是脆弱的破坏性错误和快速退相干。我们的工作为实现更复杂的动力学拓扑序（8，9）铺平了道路，这将使量子信息的容错操作成为可能。
Nascent platforms for programmable quantum simulation offer unprecedented access to new regimes of far-from-equilibrium quantum many-body dynamics in almost isolated systems. Here achieving precise control over quantum many-body entanglement is an essential task for quantum sensing and computation. Extensive theoretical work indicates that these capabilities can enable dynamical phases and critical phenomena that show topologically robust methods to create, protect and manipulate quantum entanglement that self-correct against large classes of errors. However, so far, experimental realizations have been confined to classical (non-entangled) symmetry-breaking orders(1-5). In this work, we demonstrate an emergent dynamical symmetry-protected topological phase(6), in a quasiperiodically driven array of ten Yb-171(+) hyperfine qubits in Quantinuum's System Model H1 trapped-ion quantum processor(7). This phase shows edge qubits that are dynamically protected from control errors, cross-talk and stray fields. Crucially, this edge protection relies purely on emergent dynamical symmetries that are absolutely stable to generic coherent perturbations. This property is special to quasiperiodically driven systems: as we demonstrate, the analogous edge states of a periodically driven qubit array are vulnerable to symmetry-breaking errors and quickly decohere. Our work paves the way for implementation of more complex dynamical topological orders(8,9) that would enable error-resilient manipulation of quantum information.