Quantum information entropy for one-dimensional system undergoing quantum phase transition |
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Affiliation: | 1. Software Institute, Dalian Jiaotong University, Dalian 116028, China;2. CIDETEC, Instituto Politécnico Nacional, Unidad Profesional ALM, Mexico D. F. 07700, Mexico;3. Department of Physics, Liaoning Normal University, Dalian 116029, China |
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Abstract: | Calculations of the quantum information entropy have been extended to a non-analytically solvable situation. Specifically, we have investigated the information entropy for a one-dimensional system with a schematic "Landau" potential in a numerical way. Particularly, it is found that the phase transitional behavior of the system can be well expressed by the evolution of quantum information entropy. The calculated results also indicate that the position entropy S_x and the momentum entropy S_p at the critical point of phase transition may vary with the mass parameter M but their sum remains as a constant independent of M for a given excited state. In addition, the entropy uncertainty relation is proven to be robust during the whole process of the phase transition. |
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Keywords: | quantum information entropy quantum phase transition entropy uncertainty relation |
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