Entanglement entropy in the spin-1/2 Heisenberg chain with hexamer modulation of exchange

Shafieinejad, F.; Hasanzadeh, J.; Mahdavifar, S.

doi:10.1016/j.physa.2020.124794

Cited by 5 publications

(1 citation statement)

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“…In the foundations and application of quantum mechanics, entanglement is a interesting feature that gives an understanding of non-local correlations, with several applications in the fields of quantum information processing and quantum computation [1][2][3][4]. Regarding the description of the entanglement, the entropy is a key concept [5,6], and its study covers a wide range of research topics like coherent information [7,8], long-range interactions [9,10], quantum-phase transitions and thermodynamics [11][12][13], among others [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Entropy exchange and thermal fluctuations in the Jaynes-Cummings model

Castaño-Yepes

2021

Preprint

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The time-dependence of the quantum entropy for a two-level atom interacting with a single-cavity mode is computed by using the Jaynes-Cummings model, when the initial state of the radiation field is prepared in a thermal state with temperature fluctuations. In order to describe the out-of-equilibrium situation, the Super Statistics approximation is implemented so that the gamma and the multi-level distribution functions are used to introduce the inverse temperature fluctuations. By making a parallelism with the Tsallis non-additive formalism, the entropy for the field is computed with the q-logarithm prescription, so that the entropy of the whole system is a mixture of the von-Neumman (for the atom) and Tsallis-like (for the cavity) entropies. The impact of the initial state of the atom is also taken into account. The results shows that, in the first case, the q-parameter modifies appreciably the partial entropies, whereas in the second one, the way in which the inverse temperatures are distributed may led or not changes in the entropy functions.

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