Active control of a plasmonic metamaterial for quantum state engineering
Active control of a plasmonic metamaterial for quantum state engineering
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DOI：
10.1103/physreva.97.053810
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发表时间：
2018-05-08
影响因子：
2.9
通讯作者：
Tame, M. S.
中科院分区：
文献类型：
--
作者：
Uriri, S. A.;Tashima, T.;Tame, M. S.
我们实验证明了在量子状态下运行的等离子体超材料的主动控制。研究了一种由金纳米棒组成的二维超材料。利用外部激光控制超材料的温度，并对通过的单光子偏振编码量子比特进行量子过程层析成像，将超材料表征为可变量子通道。对于特定的纳米棒尺寸，整体极化响应可以调高33%。为了解释结果，我们建立了一个理论模型，并发现实验结果与预测行为吻合得很好。这项工作超越了简单的被动量子等离子体系统的使用，并表明等离子体元件的外部控制可以实现可用于量子态工程的灵活设备。
We experimentally demonstrate the active control of a plasmonic metamaterial operating in the quantum regime. A two-dimensional metamaterial consisting of unit cells made from gold nanorods is investigated. Using an external laser, we control the temperature of the metamaterial and carry out quantum process tomography on single-photon polarization-encoded qubits sent through, characterizing the metamaterial as a variable quantum channel. The overall polarization response can be tuned by up to 33% for particular nanorod dimensions. To explain the results, we develop a theoretical model and find that the experimental results match the predicted behavior well. This work goes beyond the use of simple passive quantum plasmonic systems and shows that external control of plasmonic elements enables a flexible device that can be used for quantum state engineering.