Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
Phys Rev Lett. 2015 Aug 14;115(7):070502. doi: 10.1103/PhysRevLett.115.070502. Epub 2015 Aug 13.
Here we present the quantum storage of three-dimensional orbital-angular-momentum photonic entanglement in a rare-earth-ion-doped crystal. The properties of the entanglement and the storage process are confirmed by the violation of the Bell-type inequality generalized to three dimensions after storage (S=2.152±0.033). The fidelity of the memory process is 0.993±0.002, as determined through complete quantum process tomography in three dimensions. An assessment of the visibility of the stored weak coherent pulses in higher-dimensional spaces demonstrates that the memory is highly reliable for 51 spatial modes. These results pave the way towards the construction of high-dimensional and multiplexed quantum repeaters based on solid-state devices. The multimode capacity of rare-earth-based optical processors goes beyond the temporal and the spectral degree of freedom, which might provide a useful tool for photonic information processing.
在这里，我们展示了在掺稀土离子晶体中存储三维轨道角动量光子纠缠态。通过存储后的三维广义贝尔型不等式违背实验（S=2.152±0.033）证实了纠缠和存储过程的性质。通过三维全量子过程层析成像技术确定存储过程的保真度为 0.993±0.002。对高维空间中存储的弱相干脉冲的可见度的评估表明，该存储器对于 51 个空间模式具有高度可靠性。这些结果为基于固态器件构建高维复用量子中继器铺平了道路。基于稀土的光学处理器的多模容量超出了时间和光谱自由度，这可能为光子信息处理提供有用的工具。
