Quantum storage of high-dimensional entanglement

Zong‐Quan Zhou, Yi-Lin Hua, Xiao Liu +5 more

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.

Manuel Erhard, Mario Krenn, Anton Zeilinger

Xin Yang, Jinwen Wang, Shuwei Qiu +9 more

Photonic multi-dimensional storage capabilities and the high storage efficiency of multiplexed quantum storage devices are critical metrics that directly determine the entanglement distribution efficiency of quantum networks. In this work, we experimentally demonstrate a high-efficiency storage for multi-dimensional photonic states in path, polarization, and orbital angular momentum (with vector beams serving as the photonic dimensional carriers of polarization and orbital angular momentum) in laser-cooled Rb 87 atom ensembles with cigar shapes. We achieve path-multiplexed storage of two-channel vector beams at the single-photon level, with storage efficiency exceeding 74% for first-order vector beams and 72% for second-order vector beams. Additionally, the storage fidelity surpasses 89% for both types. Furthermore, we achieve a storage time of approximately 7 μs for two-channel vector beams, and the spatial structure and phase information are preserved during storage through performed projection measurements. The results confirm that our system has the capability for optical storage in photon polarization and orbital angular momentum, as well as in a multi-dimensional photon path. These results show significant potential for advancing large-scale repeater-based quantum networks and distributed quantum computing.

Guillaume Aubrun

Jincheng Zhang

This paper investigates the potential of utilizing quantum entanglement for advanced data storage and retrieval, specifically focusing on the creation and manipulation of highly structured topological information. Traditional data storage methods are limited by the capacity of storing discrete data units. Quantum entanglement offers a fundamentally different approach, allowing for the encoding of complex, topological information into entangled states. We explore the feasibility of utilizing this entanglement to achieve high-dimensional data storage and retrieval with enhanced precision and speed compared to conventional methods. The core mechanism involves encoding information into entangled states, leveraging the unique properties of entanglement for precise representation and efficient retrieval. This research proposes a novel framework for utilizing quantum entanglement to overcome limitations of current data storage and retrieval techniques. The study will detail the theoretical underpinnings, potential challenges, and preliminary experimental investigations aimed at validating the core concepts.

S. M. Zangi, Chitra Shukla, Khalid Naseer +1 more