Quantum plasmonic N00N state in a silver nanowire and its use for quantum sensing
Quantum plasmonic N00N state in a silver nanowire and its use for quantum sensing
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DOI：
10.1364/optica.5.001229
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发表时间：
2018-05
期刊：
影响因子：
10.4
通讯作者：
Yang Chen;Changhyoup Lee;Liu Lu;Di Liu;Yunkun Wu;Lan-Tian Feng;Ming Li;C. Rockstuhl;G. Guo-G.-Gu
中科院分区：
文献类型：
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作者：
Yang Chen;Changhyoup Lee;Liu Lu;Di Liu;Yunkun Wu;Lan-Tian Feng;Ming Li;C. Rockstuhl;G. Guo-G.-Gu
近年来，随着等离子体的使用，在纳米尺度上控制光的量子态已经成为可能。在这里，已经提出了许多类型的纳米光子器件和应用，它们利用量子光学效应，尽管存在固有的损耗。一个关键的例子是量子等离子体传感，它提供了超过经典极限的灵敏度，使用纠缠N00N状态和它们的概括在一个紧凑的系统操作低于衍射极限。在这项工作中，我们实验证明了一个双等离子体纠缠态N00N（N=2）的激发和传输的银纳米线，并评估我们的系统进行量子传感的性能。偏振纠缠的光子对在银纳米线中被转换成等离子体激元，其在5 μ m的距离上传播并重新转换回光子。对等离子体激元系统的全面分析发现，高质量的纠缠始终保持不变。我们通过符合测量测量了纠缠态的特征超分辨相位振荡。我们还确定了在我们的设置中的各种损失来源，并展示了如何在原则上减轻它们，以达到超越经典传感极限的超灵敏度。我们的研究结果表明，极化纠缠可以保存在等离子体纳米线和传感与量子优势是可能的适度的损失。
The control of quantum states of light at the nanoscale has become possible in recent years with the use of plasmonics. Here, many types of nanophotonic devices and applications have been suggested that take advantage of quantum optical effects, despite the inherent presence of loss. A key example is quantum plasmonic sensing, which provides sensitivity beyond the classical limit using entangled N00N states and their generalizations in a compact system operating below the diffraction limit. In this work, we experimentally demonstrate the excitation and propagation of a two-plasmon entangled N00N state (N=2) in a silver nanowire, and assess the performance of our system for carrying out quantum sensing. Polarization entangled photon pairs are converted into plasmons in the silver nanowire, which propagate over a distance of 5 um and re-convert back into photons. A full analysis of the plasmonic system finds that the high-quality entanglement is preserved throughout. We measure the characteristic super-resolution phase oscillations of the entangled state via coincidence measurements. We also identify various sources of loss in our setup and show how they can be mitigated, in principle, in order to reach super-sensitivity that goes beyond the classical sensing limit. Our results show that polarization entanglement can be preserved in a plasmonic nanowire and that sensing with a quantum advantage is possible with moderate loss present.