关键词: 量子纠缠, 热纠缠, 并协度, 负性纠缠度

Abstract:  Quantum entanglement, as one of the most basic and important physical resources, has shown great practical application prospect in quantum computation and quantum information, and is the foundation of modern quantum computer. In the acquisition of entangled state, some external factors, such as electromagnetic field, temperature and so on, will affect the entanglement state in different degrees. In this paper, the thermal entanglement of the spin-Heisenberg model is calculated by using two different entanglement measures: Concurrence and Negativity.

Key words: quantum entanglement, thermal entanglement, concurrence, negativity