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Updated: Feb 5, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
High-dimensional entanglement between distant atomic-ensemble memories
Dong-Sheng Ding1,2, Wei Zhang1,2, Shuai Shi1,2
1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China.
Abstract:
Entangled quantum states in high-dimensional space show many advantages compared with entangled states in two-dimensional space. The former enable quantum communication with higher channel capacity, enable more efficient quantum-information processing and are more feasible for closing the detection loophole in Bell test experiments. Establishing high-dimensional entangled memories is essential for long-distance communication, but its experimental realization is lacking. We experimentally established high-dimensional entanglement in orbital angular momentum space between two atomic ensembles separated by 1 m. We reconstructed the density matrix for a three-dimensional entanglement and obtained an entanglement fidelity of (83.9±2.9)%. More importantly, we confirmed the successful preparation of a state entangled in more than three-dimensional space (up to seven-dimensional) using entanglement witnesses. Achieving high-dimensional entanglement represents a significant step toward a high-capacity quantum network.
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