Quantum discord of thermal two-photon orbital angular momentum state:mimicking teleportation to transmit an image  

作　　者：Lixiang Chen 

机构地区：[1]Department of Physics and Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices,Xiamen University,Xiamen 361005,China

出　　处：《Light(Science & Applications)》2021年第8期1401-1408,共8页光（科学与应用)（英文版）

基　　金：the National Natural Science Foundation of China(NSFC)(12034016,61975169);the Fundamental Research Funds for the Central Universities at XMU(20720190057,20720200074);the program for New Century Excellent Talents in University of China(NCET-13-0495).

摘　　要：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.

关 键 词：MOMENTUM STATE ORBITAL 

分 类 号：O41[理学—理论物理]