Shi Shaoping, Tian Long, Wang Yajun, Zheng Yaohui, Xie Changde, Peng Kunchi
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
Phys Rev Lett. 2020 Aug 14;125(7):070502. doi: 10.1103/PhysRevLett.125.070502.
Channel multiplexing quantum communication based on exploiting continuous-variable entanglement of optical modes offers great potential to enhance channel capacity and save quantum resource. Here, we present a frequency-comb-type control scheme for simultaneously extracting a lot of entangled sideband modes with arbitrary frequency detuning from a squeezed state of light. We experimentally demonstrate fourfold channel multiplexing quantum dense coding communication by exploiting the extracted four pairs of entangled sideband modes. Due to high entanglement and wide frequency separation between each entangled pairs, these quantum channels have large channel capacity and the cross talking effect can be avoided. The achieved channel capacities have surpassed that of all classical and quantum communication under the same bandwidth published so far. The presented scheme can be extended to more channels if more entangled sideband modes are extracted.
基于利用光模式的连续变量纠缠的信道复用量子通信在增强信道容量和节省量子资源方面具有巨大潜力。在此，我们提出一种频率梳型控制方案，用于从光的压缩态中同时提取大量具有任意频率失谐的纠缠边带模式。我们通过利用提取的四对纠缠边带模式，实验演示了四重信道复用量子密集编码通信。由于每对纠缠模式之间具有高纠缠度和宽频率间隔，这些量子信道具有大的信道容量并且可以避免串扰效应。所实现的信道容量已超过迄今发表的相同带宽下所有经典和量子通信的信道容量。如果提取更多的纠缠边带模式，所提出的方案可以扩展到更多信道。
