Wang Guan-Yu, Ren Bao-Cang, Deng Fu-Guo, Long Gui-Lu
Opt Express. 2019 Mar 18;27(6):8994-9003. doi: 10.1364/OE.27.008994.
We present a simple protocol for complete analysis of 16 hyperentangled Bell states of two-photon system in the polarization and the first longitudinal momentum degrees of freedom (DOFs). This complete analysis protocol is accomplished with the auxiliary hyperentangled Bell state in the frequency and the second longitudinal momentum DOFs utilizing the experimentally available optical elements including linear optical elements which manipulate the polarizations and the longitudinal momentums and the optical devices which manipulate frequencies of photons. This complete analysis protocol allows the transmission of log16=4 bits of classical information via quantum hyperdense coding scheme, which is the upper bound of the transmission capacity of the quantum hyperdense coding scheme based on 16 orthogonal hyperentangled Bell states. This complete analysis protocol has a potential to be experimentally realized and is useful for high-capacity quantum communication based on hyperentangled states.
我们提出了一种简单的协议，用于在偏振和第一纵向动量自由度（DOF）下对双光子系统的16个超纠缠贝尔态进行完整分析。该完整分析协议利用频率和第二纵向动量自由度中的辅助超纠缠贝尔态来完成，使用了实验中可用的光学元件，包括操纵偏振和纵向动量的线性光学元件以及操纵光子频率的光学器件。该完整分析协议允许通过量子超密集编码方案传输log16 = 4比特的经典信息，这是基于16个正交超纠缠贝尔态的量子超密集编码方案传输容量的上限。该完整分析协议具有在实验中实现的潜力，并且对于基于超纠缠态的高容量量子通信很有用。
