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Quantum Information Processing

Thermal quantum correlation and entanglement in the Bose–Hubbard Hamiltonian

  • 01-10-2018
Published in:
Authors
Hakimeh Jaghouri
Samira Nazifkar
Hamed Jafarzadeh
Kurosh Javidan
Published in
Quantum Information Processing | Issue 10/2018

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Abstract

We study a two-qutrit system which is described by the Bose–Hubbard Hamiltonian with two external magnetic fields. The entanglement (through the negativity) and quantum correlation (through the geometric discord) between the qutrits are calculated as functions of the magnetic field (B), the temperature (T), the linear and nonlinear coupling constants among two spins (J and K). Then, we compare the effect of these parameters on entanglement and quantum correlation of this system. For some values of system parameters, we show that the negativity is zero while, the geometric discord is nonzero. Moreover, we investigate the effect of finite external magnetic fields direction on these measures. This study leads to some new and interesting results as well.

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previous article Non-classical correlations in two quantum dots coupled in a coherent resonator field under decoherence
next article Quantum coherence of fermionic systems in noninertial frames beyond the single-mode approximation
Title
Thermal quantum correlation and entanglement in the Bose–Hubbard Hamiltonian
Authors
Hakimeh Jaghouri
Samira Nazifkar
Hamed Jafarzadeh
Kurosh Javidan
Publication date
01-10-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 10/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-018-1961-3
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