Probing quantum walks through coherent control of high-dimensionally entangled photons
Probing quantum walks through coherent control of high-dimensionally entangled photons
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DOI：
10.1126/sciadv.aba8066
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发表时间：
2020-07-01
期刊：
影响因子：
13.6
通讯作者：
Weiner, Andrew M.
中科院分区：
文献类型：
--
作者：
Imany, Poolad;Lingaraju, Navin B.;Weiner, Andrew M.
对量子行走持续时间的控制对于释放量子搜索和多体物理模拟的全部潜力至关重要。在这里，我们报告了双光子频率梳的量子行走，其中行走的持续时间或电路深度可以在连续的范围内调节，而不会改变系统的物理足迹--这是以前的光子实现所缺少的特征。在我们的平台中，纠缠的光子对在离散的频率模式之间跳跃，这些模式之间的耦合是通过波导折射率的电光调制来实现的。通过控制不同模式的相位，我们展示了丰富多样的行为：从表现出增强的弹道传输或强烈的能量限制的行走，到具有散射中心或局部陷阱的子空间。我们还探索了纠缠维度在创建能量束缚态中的作用，这说明了这些行走在量子化高维纠缠中的潜力。
Control over the duration of a quantum walk is critical to unlocking its full potential for quantum search and the simulation of many-body physics. Here we report quantum walks of biphoton frequency combs where the duration of the walk, or circuit depth, is tunable over a continuous range without any change to the physical footprint of the system-a feature absent from previous photonic implementations. In our platform, entangled photon pairs hop between discrete frequency modes with the coupling between these modes mediated by electrooptic modulation of the waveguide refractive index. Through control of the phase across different modes, we demonstrate a rich variety of behavior: from walks exhibiting enhanced ballistic transport or strong energy confinement, to subspaces featuring scattering centers or local traps. We also explore the role of entanglement dimensionality in the creation of energy bound states, which illustrates the potential for these walks to quantify high-dimensional entanglement.