Quantum superposition and entanglement of mesoscopic plasmons
Quantum superposition and entanglement of mesoscopic plasmons
复制标题
DOI：
10.1088/1367-2630/8/1/013
复制
发表时间：
2005-12
影响因子：
3.3
通讯作者：
Sylvain Fasel;M. Halder;N. Gisin;H. Zbinden
中科院分区：
文献类型：
--
作者：
Sylvain Fasel;M. Halder;N. Gisin;H. Zbinden
量子叠加和纠缠是量子信息科学的核心。尽管这些系统在量子态存储和处理方面很有前途，但在介观水平上对这些现象的研究却很少。在这里，我们提出了两个新的实验与表面等离子体在厘米长的金属条形波导传播。我们证明了两个等离子体激元可以在遥远的地方纠缠。此外，我们创建一个单一的等离子体在时间叠加态：它存在于两个广泛分离的时刻的叠加。这些量子态，使用电信波长的光子创建，由编码单个量子比特信息的介观电子数量共同持有;它们被证明对退相干非常鲁棒。
Quantum superpositions and entanglement are at the heart of the quantum information science. There have been only a few investigations of these phenomena at the mesoscopic level, despite the fact that these systems are promising for quantum state storage and processing. Here, we present two novel experiments with surface plasmons propagating on cm-long metallic stripe waveguides. We demonstrate that two plasmons can be entangled at remote places. In addition, we create a single plasmon in a temporal superposition state: it exists in a superposition of two widely separated moments. These quantum states, created using photons at telecom wavelength, are collectively held by a mesoscopic number of electrons coding a single-quantum bit of information; they are shown to be very robust against decoherence.