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Related Experiment Video

Updated: Feb 5, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

High-dimensional entanglement between distant atomic-ensemble memories.

Dong-Sheng Ding^1,2, Wei Zhang^1,2, Shuai Shi^1,2

¹Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China.

Light, Science & Applications

|September 1, 2018

Summary

This summary is machine-generated.

Researchers created high-dimensional entangled quantum states in orbital angular momentum space between atomic ensembles. This breakthrough advances quantum networks by enabling higher capacity and efficiency for quantum communication and information processing.

Keywords:

high-dimensional entanglement orbital angular momentum quantum memory

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Area of Science:

Quantum Information Science
Quantum Optics
Atomic Physics

Background:

High-dimensional entangled states offer advantages over two-dimensional states for quantum communication, information processing, and Bell tests.
Experimental realization of high-dimensional entangled memories is crucial for long-distance quantum communication but remains a challenge.

Purpose of the Study:

To experimentally establish high-dimensional entanglement in orbital angular momentum (OAM) space between spatially separated atomic ensembles.
To demonstrate the feasibility of creating and verifying entanglement in dimensions exceeding three.

Main Methods:

Generation of entanglement between two atomic ensembles separated by 1 meter using orbital angular momentum.
Reconstruction of the density matrix for a three-dimensional entangled state.
Utilizing entanglement witnesses to confirm entanglement in higher dimensions (up to seven-dimensional).

Main Results:

Successful experimental establishment of high-dimensional entanglement in OAM space.
Achieved an entanglement fidelity of (83.9±2.9)% for a three-dimensional entangled state.
Confirmed the preparation of states entangled in up to seven dimensions.

Conclusions:

The experimental creation of high-dimensional entanglement in OAM space is a significant advancement.
This work paves the way for developing high-capacity quantum networks and advanced quantum information processing.
Demonstrates a viable method for generating and verifying multi-dimensional entanglement crucial for future quantum technologies.