At the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), a team of researchers headed by academician Guangcan Guo has achieved progress in high-dimensional quantum teleportation.
Published in Physical Review Letters, the study demonstrates the teleportation of high-dimensional states in a three-dimensional six-photon system. Quantum teleportation is one of the main technologies to achieve the long-distance transmission of unknown quantum states from one location to another.
When compared to a two-dimensional system, high-dimensional system quantum networks offer the benefits of better security and higher channel capacity. In the recent past, more and more scientists in the quantum information field have been making attempts to achieve efficient high-dimensional quantum teleportation to realize efficient high-dimensional quantum networks.
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.
Hu, X.-M., et al. (2021) Experimental High-Dimensional Quantum Teleportation. Physical Review Letters. doi.org/10.1103/PhysRevLett.125.230501.