Quantum spin dynamics and entanglement generation with hundreds of trapped ions
Quantum spin dynamics and entanglement generation with hundreds of trapped ions
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DOI：
10.1126/science.aad9958
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发表时间：
2016-06-10
期刊：
影响因子：
56.9
通讯作者：
Bollinger, John J.
中科院分区：
文献类型：
--
作者：
Bohnet, Justin G.;Sawyer, Brian C.;Bollinger, John J.
自旋模型的量子模拟可以提供对经典计算机难以或不可能研究的问题的洞察。囚禁离子是量子模拟的既定平台，但只有少于20个离子的系统才表现出量子相关性。我们研究了Penning阱中Be-9（+）离子二维阵列中工程化的均匀伊辛相互作用所产生的量子自旋动力学。我们验证了多达219个离子的自旋压缩态的纠缠，直接观察到4.0 +/-0.9分贝的光谱增强，并观察到与过压缩态一致的非高斯统计状态。与从头算理论，包括相互作用和退相干的良好协议奠定了基础的横向场伊辛模型与可变范围的相互作用，这是一般难以与经典方法的模拟。
Quantum simulation of spin models can provide insight into problems that are difficult or impossible to study with classical computers. Trapped ions are an established platform for quantum simulation, but only systems with fewer than 20 ions have demonstrated quantum correlations. We studied quantum spin dynamics arising from an engineered, homogeneous Ising interaction in a two-dimensional array of Be-9(+) ions in a Penning trap. We verified entanglement in spin-squeezed states of up to 219 ions, directly observing 4.0 +/- 0.9 decibels of spectroscopic enhancement, and observed states with non-Gaussian statistics consistent with oversqueezed states. The good agreement with ab initio theory that includes interactions and decoherence lays the groundwork for simulations of the transverse-field Ising model with variable-range interactions, which are generally intractable with classical methods.