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Experimental Verification of Entanglement Generated in a Plasmonic System
Nano Letters ( IF 10.8 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acs.nanolett.7b03372
F. Dieleman 1 , M. S. Tame 2, 3 , Y. Sonnefraud 4, 5 , M. S. Kim 6 , S. A. Maier 1, 7
Affiliation  

A core process in many quantum tasks is the generation of entanglement. It is being actively studied in a variety of physical settings—from simple bipartite systems to complex multipartite systems. In this work we experimentally study the generation of bipartite entanglement in a nanophotonic system. Entanglement is generated via the quantum interference of two surface plasmon polaritons in a beamsplitter structure, i.e., utilizing the Hong-Ou-Mandel (HOM) effect, and its presence is verified using quantum state tomography. The amount of entanglement is quantified by the concurrence and we find values of up to 0.77 ± 0.04. Verifying entanglement in the output state from HOM interference is a nontrivial task and cannot be inferred from the visibility alone. The techniques we use to verify entanglement could be applied to other types of photonic system and therefore may be useful for the characterization of a range of different nanophotonic quantum devices.

中文翻译:

等离子系统中产生纠缠的实验验证

许多量子任务的核心过程是纠缠的产生。从简单的两部分系统到复杂的多部分系统,它正在各种物理环境中得到积极研究。在这项工作中,我们通过实验研究了纳米光子系统中二元纠缠的产生。纠缠是通过分束器结构中两个表面等离激元极化子的量子干涉产生的,即利用Hong-Ou-Mandel(HOM)效应产生的纠缠,并使用量子态层析成像技术对其进行了验证。纠缠的数量通过并发来量化,我们发现值高达0.77±0.04。验证来自HOM干扰的输出状态中的纠缠是一项艰巨的任务,不能仅凭可见性来推断。
更新日期:2017-11-15
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