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Quantum discord of thermal two-photon orbital angular momentum state: mimicking teleportation to transmit an image
Light: Science & Applications ( IF 19.4 ) Pub Date : 2021-07-20 , DOI: 10.1038/s41377-021-00585-8
Lixiang Chen 1
Affiliation  

We formulate a density matrix to fully describe two-photon state within a thermal light source in the photon orbital angular momentum (OAM) Hilbert space. We prove the separability, i.e., zero entanglement of the thermal two-photon state. Still, we reveal the hidden quantum correlations in terms of geometric measures of discord. By mimicking the original protocol of quantum teleportation, we demonstrate that the non-zero quantum discord can be utilized to transmit a high-dimensional OAM state at the single-photon level. It is found that albeit the low fidelity of teleportation due to the inherent component of maximally mixed state, the information of all parameters that characterize the original state can still be extracted from the teleported one. Besides, we demonstrate that the multiple repetitions of the protocol, enable the transmission of a complex-amplitude light field, e.g., an optical image, regardless of being accompanied with a featureless background. We also distinguish our scheme of optical image transmission from that of ghost imaging.



中文翻译:

热双光子轨道角动量状态的量子不协调:模拟隐形传态传输图像

我们制定了一个密度矩阵来完全描述光子轨道角动量 (OAM) 希尔伯特空间中热光源内的双光子状态。我们证明了可分离性,即热双光子态的零纠缠。尽管如此,我们还是根据不和谐的几何度量揭示了隐藏的量子相关性。通过模仿量子隐形传态的原始协议,我们证明了非零量子不和谐可用于在单光子级别传输高维 OAM 状态。发现尽管由于最大混合状态的固有成分导致隐形传态的保真度低,但仍然可以从隐形传态中提取表征原始状态的所有参数的信息。此外,我们证明了协议的多次重复,实现复振幅光场(例如光学图像)的传输,而不管是否伴有无特征的背景。我们还将我们的光学图像传输方案与重影成像方案区分开来。

更新日期:2021-07-20
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