Remote quantum entanglement between two micromechanical oscillators
Remote quantum entanglement between two micromechanical oscillators
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DOI：
10.1038/s41586-018-0036-z
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发表时间：
2018-04-26
期刊：
影响因子：
64.8
通讯作者：
Groblacher, Simon
中科院分区：
文献类型：
--
作者：
Riedinger, Ralf;Wallucks, Andreas;Groblacher, Simon
纠缠是量子理论的一个基本特征，它允许不可分割的量子关联在遥远的各方之间共享，是量子网络的关键资源(1)。特别重要的是在远程对象之间分配纠缠的能力，这些对象也可以作为量子存储器。这在以前已经通过热（2,3）和冷原子蒸汽（4,5）、单个原子(6)和离子（7,8）以及固态系统中的缺陷（9-11）等系统实现。实际的通信应用需要几个有利特性的结合，例如特定的工作波长、高带宽和长存储寿命。在这里，我们介绍了一种纯微机械固态平台，其形式是由纳米结构硅梁制成的基于芯片的光机械谐振器。我们在相隔20厘米的两个芯片上创建并演示了两个微机械振荡器之间的纠缠。纠缠量子态由光场分布在1550纳米附近的设计波长处。因此，我们的系统可以直接并入在传统光通信频带上运行的现实光纤量子网络中。我们的结果是朝着基于硅光子学的大面积量子网络的发展迈出了重要的一步。
Entanglement, an essential feature of quantum theory that allows for inseparable quantum correlations to be shared between distant parties, is a crucial resource for quantum networks(1). Of particular importance is the ability to distribute entanglement between remote objects that can also serve as quantum memories. This has been previously realized using systems such as warm(2,3) and cold atomic vapours(4,5), individual atoms(6) and ions(7,8), and defects in solid-state systems(9-11). Practical communication applications require a combination of several advantageous features, such as a particular operating wavelength, high bandwidth and long memory lifetimes. Here we introduce a purely micromachined solid-state platform in the form of chip-based optomechanical resonators made of nanostructured silicon beams. We create and demonstrate entanglement between two micromechanical oscillators across two chips that are separated by 20 centimetres. The entangled quantum state is distributed by an optical field at a designed wavelength near 1,550 nanometres. Therefore, our system can be directly incorporated in a realistic fibre-optic quantum network operating in the conventional optical telecommunication band. Our results are an important step towards the development of large-area quantum networks based on silicon photonics.