Robust entanglement preparation against noise by controlling spatial indistinguishability
Robust entanglement preparation against noise by controlling spatial indistinguishability
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DOI：
10.1038/s41534-020-0271-7
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发表时间：
2019-06
影响因子：
7.6
通讯作者：
Farzam Nosrati;A. Castellini;G. Compagno;R. Lo Franco
中科院分区：
文献类型：
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作者：
Farzam Nosrati;A. Castellini;G. Compagno;R. Lo Franco
将复合量子系统初始化为高度纠缠态通常是使其能够用于量子技术的必要条件。然而，在准备阶段不可避免的噪声使系统状态混合，阻碍了这一目标的实现。在这里，我们在空间局部化操作和经典通信（sLOCC）的操作框架内的相同粒子系统背景下解决这个问题。我们定义了两个相同量子比特任意态的形成纠缠。然后，我们引入了空间不可区分性的熵测度作为信息资源。多亏了这些工具，我们发现空间不可分辨性，甚至是部分的，可以成为一种特性，使非局部纠缠不受制备噪声的影响，而与空间波函数的确切形状无关。这些结果证明了量子不可分辨性是无噪声纠缠产生的内在控制因素。
Initialization of composite quantum systems into highly entangled states is usually a must to enable their use for quantum technologies. However, unavoidable noise in the preparation stage makes the system state mixed, hindering this goal. Here, we address this problem in the context of identical particle systems within the operational framework of spatially localized operations and classical communication (sLOCC). We define the entanglement of formation for an arbitrary state of two identical qubits. We then introduce an entropic measure of spatial indistinguishability as an information resource. Thanks to these tools we find that spatial indistinguishability, even partial, can be a property shielding nonlocal entanglement from preparation noise, independently of the exact shape of spatial wave functions. These results prove quantum indistinguishability is an inherent control for noise-free entanglement generation.