Researchers propose an optimized detection method for large entanglement

In a study published in Physical examination letters, the team led by academician GUO Guangcan of the University of Science and Technology of China, in collaboration with Professor WANG Zizhu of the University of Electronic Science and Technology of China, for the first time proposed a method of detection optimized for large entanglement.

How to prepare for and detect quantum entanglement is the key to quantum information processing. With the increase in dimensions and particles, the larger dimension system results in both the simple difficulty of detection in the calculation and the additional costs in resources. Apparently, traditional detection methods barely work.

Faced with the challenges of large-dimensional entanglement detection, researchers adopted fidelity-based entanglement witnesses to detect a 32-dimensional entanglement state with its fidelity reaching the highest level in the world. However, for routine detection of non-maximal dimension entanglement, conventional controls based on fidelity were not applicable.

To remove this barrier, researchers must complement loyalty-based witnesses with user-friendly protocols for experiments that can detect unfaithful entanglements. Following this path, they devised a method to automatically search for optimal protocols to certify high dimensional bipartite entanglement.

They first experimentally prepared a series of large-dimension bipartite target states in an innovative way. And then they implemented some local measures to get the optimal quantum entanglement detection. To certify entanglement in four-dimensional photonic states, only a few three-setting protocols have been adopted.

This study solves the problem of detecting large-dimension bipartite entangled states. It lays the foundations for carrying out multiple processing of high-dimensional quantum information and promotes research into quantum physics in high-dimensional systems.


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