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In 2016, scientists from USTC experimentally demonstrated that nonlocality can be generated from single-particle contextuality using two-particle correlations that do not violate any Bell inequality by themselves. Thus, they were able to achieve high-fidelity three-dimensional entanglement.
In 2020, researchers achieved 32-dimensional quantum entanglement and efficient distribution of high-dimensional entanglement through an 11-km fiber to form a solid foundation for scalable quantum networks.
Auxiliary entanglement is the most important phenomenon to achieve high-dimensional quantum teleportation in a linear optical system.
The team leveraged the spatial mode (path) for encoding the three-dimensional states demonstrated to have very high fidelity, and an auxiliary entangled photon pair was used to carry out the high-dimensional Bell state measurement (HDBSM). Thus, they demonstrated the teleportation of a three-dimensional quantum state with the help of the spatial mode of a single photon.
In this study, the researchers could achieve a fidelity value of 0.5967 for the teleportation process matrix. This value is seven standard deviations more than the fidelity of 1/3, which shows that the teleportation is both non-classical and genuine three-dimensional.
This research opens the door to reconstruct complex quantum systems remotely and to develop complex quantum networks. It will also boost studies on high-dimensional quantum information tasks. Entanglement-assisted techniques for HDBSM are viable for other high-dimensional quantum information tasks.
Journal Reference:
Hu, X.-M., et al. (2021) Experimental High-Dimensional Quantum Teleportation. Physical Review Letters. doi.org/10.1103/PhysRevLett.125.230501.