Entanglement in dipolar coupling spin system in equilibrium state

被引：0
作者：
Gregory B. Furman
Victor M. Meerovich
Vladimir L. Sokolovsky
机构：
[1] Ben-Gurion University of the Negev,Physics Department
来源：
Quantum Information Processing | 2012年 / 11卷
关键词：
Entanglement; Spin dynamics; Dipolar coupling; Heat capacity;
D O I：
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学科分类号：
摘要：
We study the appearance of the entangled states in a one-dimensional finite chain of dipolar-coupling nuclear spins of 1/2 in the conditions of thermodynamic equilibrium. It is shown that entanglement is achieved by the application of a low external magnetic field in which the Zeeman interaction energy is the order of or even less than the dipolar interaction one. When these energies are equal, the critical temperature, i. e. the temperature of the entanglement appearance, coincides with the temperature at which the heat capacity of the spin chain achieves its maximum. The obtained relationship between the critical temperature and the magnetic field can be considered as an entanglement witness. The dependences of the heat capacity on temperature and magnetic field have different character for entangled and separable states and can be served for experimental detection of entangled states.
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页码：1603 / 1617
页数：14
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