Experiments verify that quantum states in multibody systems can be guided simultaneously

Li Chuanfeng, Xu Jinshi, Sun Kai and others from the team of academicians Guo Guangcan of the University of Science and Technology of China conducted experimental research on the relationship structure of multibody quantum guidance, and for the first time observed the non-singled sharing relationship of multibody quantum guidance, that is, the quantum state of one of them can be guided by the other two at the same time. The results of the research were recently published in the Physical Review Letters.

Quantum guidance structure in a three-body system < font class=

Quantum guided structure in three-body system Courtesy of The University of Science and Technology of China

Quantum guidance describes the ability of one particle to influence the quantum state of another particle through local measurements. As a quantum non-local phenomenon, quantum guidance has a unique asymmetric nature, which can further realize unidirectional quantum guidance, that is, one party can guide the other, and vice versa. In the study of multibody quantum guidance, the unmatched relationship limits the ability of quantum guidance to be shared between individuals, so that one party cannot be guided by other participants at the same time.

However, theoretical studies have shown that under the condition of increasing the measurement direction, the multibody quantum guide will violate the phenomenon of unmatchedness, showing the rich guidance sharing relationship structure between the many bodies. In order to experimentally verify this non-monolithic sharing relationship, researchers need to be able to make arbitrary measurements of multibody quantum systems, which requires the preparation of multibody entangled qubit systems with high fidelity.

Li Chuanfeng, Xu Jinshi, Sun Kai and others have systematically carried out experimental research on quantum guidance in recent years. On this basis, the research team further used the three degrees of freedom of polarization, path and orbital angular momentum of photons to construct a three-qubit system and prepared a series of three-body entangled states with an average fidelity of 96%. By expanding the uncertain relationship criterion of quantum guidance, the non-singled sharing relationship of multibody quantum guidance is studied.

Experimental results show that in a three-body quantum system, the quantum state of one party can be guided by the other two at the same time, which violates the traditional unmatched relationship and confirms the shared nature of multibody quantum guidance. The research team demonstrated different quantum guidance architectures by fully analyzing the three-body system in the W state (a class of multibody entangled states). Using the confirmed shared relationship of multibody quantum guidance non-monogamer, the research team further realized the experimental verification of three-body true entanglement. Compared to conventional methods, this detection method requires fewer measurement resources and demonstrates its efficiency.

This achievement demonstrates the rich relationship structure of quantum guidance in multibody systems, deepens the understanding of the physical concept of quantum guidance, and is of great significance for the basic research of quantum information. At the same time, it provides a comprehensive analysis perspective for information protocols based on quantum guided monomatism, and has important application prospects in multi-user quantum communication, quantum network construction, and multi-body entanglement detection. (Source: China Science Daily, Gui Yun’an, Wang Min)

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