Quantum-guided non-Markov kinetic evolution observed at USTC

Li Chuanfeng, Xu Jinshi, Sun Kai and others from the team of Academician Guo Guangcan of the University of Science and Technology of China experimentally studied the dynamic evolution of quantum guidance in open systems, and verified the role of non-Markov memory effects in the process of restoring quantum guidance. On May 16, the research results were published online in Physical Review Letters.

Evolutionary phenomena of quantum guidance in non-Markov processes. Photo courtesy of China University of Science and Technology

Quantum guidance is a quantum non-local association between quantum entanglement and Bell nonlocality that describes the phenomenon in which local measurements of one affect the quantum state of the other. Its unique directionality allows for one-way quantum guidance, i.e. one party can successfully guide the other, but not vice versa. Most current quantum guidance research is carried out under closed quantum systems, and in practice, the interaction between quantum systems and the environment is inevitable, and this interaction usually causes the system’s information to gradually dissipate to the environment. However, in a non-Markov environment, the memory effect causes the dissipated information to flow back from the environment into the quantum system, and the specific ability to return is characterized by the non-Markov degree of the environment, and a higher non-Markov degree means a stronger ability to return information.

In recent years, Li Chuanfeng, Xu Jinshi, Sun Kai and others have carried out a series of experimental studies on quantum guidance, including the verification of full-pair non-quantum guidance, the realization of one-way quantum guidance, the application of quantum guidance in subchannel identification tasks, and the verification of the non-monocompatible sharing relationship of many-body quantum guidance.

In this work, the research group experimentally prepared two different non-Markov degree environments, first studied the dynamic evolution of quantum guidance in the dissipative environment, and realized the dissipation process of the system state from the initial bidirectional to unidirectional and non-guided by adjusting the evolution time in the dissipative environment.

The research group further realized quantum guided recovery in higher non-Markov degree environments, and verified that the higher the non-Markov degree environment, the stronger the memory effect and the stronger the recovery ability to quantum guidance. In addition, the research team also confirmed the hierarchical relationship between quantum entanglement and quantum guidance by observing that the guideable quantum state gradually evolves into an entangled but non-guided quantum state.

According to the researchers, the results show the influence of non-Markov memory effect on the evolution of quantum guidance dynamics in open systems, deepen the understanding of quantum guidance directionality, and provide new ideas for its application in open quantum systems. (Source: Wang Min, China Science News)

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