Fisher information, R¨¦nyi entropy power and quantum phase transition in the Dicke model

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• 作者：Á ; . Nagy^a ; ^{anagy@madget.atomki.hu} ; E. Romera^b ; ^{eromera@ugr.es}
• 关键词：Quantum phase transition ; Dicke model ; Fisher information ; Fisher-Ré ; nyi information product
• 刊名：Physica A
• 出版年：2012
• 出版时间：1 July, 2012
• 年：2012
• 卷：391
• 期：13
• 页码：3650-3655
• 全文大小：269 K

文摘

Fisher information, R¨¦nyi entropy power and Fisher-R¨¦nyi information product are presented for the Dicke model. There is a quantum phase transition in this quantum optical model. It is pointed out that there is an abrupt change in the Fisher information, R¨¦nyi entropy power, the Fisher, Shannon and R¨¦nyi lengths at the transition point. It is found that these quantities diverge as the characteristic length: around the critical value of the coupling strength for any value of the parameter .