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arXiv 1402.0955quant-phphysics.optics
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单表面等离子体激元的高可见度片上量子干涉

High visibility on-chip quantum interference of single surface plasmons

Yong-Jing Cai, Ming Li, Xi-Feng Ren, Chang-Ling Zou, Xiao Xiong, Hua-Lin Lei, Bi-Heng Liu, Guo-Ping Guo, Guang-Can Guo

摘要:

基于介质波导的量子光子集成电路在线性光量子计算中得到了广泛的应用。最近,表面等离子体已经被引入到这个应用中,因为它们可以限制和操纵超过衍射极限的光。在本研究中,利用介电负载的表面等离子体激元波导实现了两个单表面等离子体激元的片上量子干涉。高可见性(大于90%)证明了单等离子体激元的玻色子性质,并强调了实现线性光量子计算的基本量子逻辑门的可行性。还讨论了等离子体波导中的本征损耗对量子信息处理的影响。虽然这种效应的影响在当前的实验中可以忽略不计,但我们的研究表明,在某些情况下,这种损失可以显着降低量子干涉的可见性;因此,在设计QPIC器件时,必须仔细考虑量子相干性。

英文摘要:

Quantum photonic integrated circuits (QPICs) based on dielectric waveguides have been widely used in linear optical quantum computation. Recently, surface plasmons have been introduced to this application because they can confine and manipulate light beyond the diffraction limit. In this study, the on-chip quantum interference of two single surface plasmons was achieved using dielectric-loaded surface-plasmon-polariton waveguides. The high visibility (greater than 90%) proves the bosonic nature of single plasmons and emphasizes the feasibility of achieving basic quantum logic gates for linear optical quantum computation. The effect of intrinsic losses in plasmonic waveguides with regard to quantum information processing is also discussed. Although the influence of this effect was negligible in the current experiment, our studies reveal that such losses can dramatically reduce quantum interference visibility in certain cases; thus, quantum coherence must be carefully considered when designing QPIC devices.

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