The group led by Professor Li Pengbo at the School of Physics, Xi'an Jiaotong University has made important progress in the study of quantum three-body interactions and three-body entanglement, proposing a new mechanism to realize spin-magnet-phonon three-body interactions. 

The results, entitled Enhanced Tripartite Interactions in Spin-Magnon-Mechanical Hybrid Systems, were recently published in Physical Review Letters, one of top international journals in physics. 

Li's team conducted a comprehensive quantum theoretical study on the electronic spin of diamond NV centers and magneto-mechanical devices. They discovered and proposed a novel theoretical model that utilizes the relative vibration between the spin and micro-magnet to achieve direct interaction between the spin, magnetic particle, and phonon.

(a) Diagram of the spin-magnet-phonon coupling model (b) Three possible realization schemes

The coherent interaction between different quantum systems is a fundamental scientific problem in quantum physics and quantum technology. When there is relative motion between the spin and micro-magnet, the magnetic field of the magnetic particle sensed by the spin will change, resulting in direct coherent coupling between the three degrees of freedom at the single quantum level.

A breakthrough was achieved in the study of the strong coupling between three distinct degrees of freedom - spin, magnetic particle, and phonon - using a spin-magnetic particle-phonon system based on diamond NV center electronic spin and magneto-mechanical devices. By directly interacting with these three degrees of freedom, this research provides a new way of controlling and enhancing the behavior of quantum systems. This has great potential for a wide range of applications in quantum technologies, as well as fundamental scientific research.

This study was a collaborative effort involving multiple parties, with Professor Franco Nori from the RIKEN Institute in Japan being one of the participants. The integration of expertise and resources from different institutions and countries is critical in advancing cutting-edge research. The international nature of this project also highlights the importance of global cooperation in the pursuit of scientific knowledge and technological advancement.