![]() For example, it accurately explains the magnetic order in the ferromagnet 13. It is known that the Heisenberg model is a classic model of the open quantum system. And when the open system is weakly coupled with the environment, we can use the Markov approximation to get the approximation equation. ![]() When describing the physical changes of a system, we often use the method of the master equation. ![]() To gain a deeper understanding of the similarities and differences between such discord-like quantum correlations, we will use a model which can be solved exactly-the Heisenberg model in contact with a thermal reservoir. As one of discord-like quantum correlations, the geometric quantum discord, which will be used in this paper, has been widely concerned because it is easier to calculate and useful. After quantum discord was firstly proposed by Ollivier and Zurek 2 and by Henderson and Vedral 12 respectively, a series of discord-like quantum correlations were proposed which exhibit different properties when characterizing the dynamics of the same quantum system and have become important resources in quantum theory. Quantum correlation has multiple levels, such as nonlocal 9, steerable 10 or entangled 11, and a framework for measuring the quantum system has been built. Quantum correlation, as one of the basic questions in quantum theory 5, has a great development in recent years 6, 7, 8. Quantum theory has received extensive attention in recent years due to its wide usage in a large number of new technologies 1, 2, 3, 4.
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