scholarly journals Finite temperature largeNgauge theory with quarks in an external magnetic field

2008 ◽  
Vol 2008 (07) ◽  
pp. 080-080 ◽  
Author(s):  
Tameem Albash ◽  
Veselin Filev ◽  
Clifford V Johnson ◽  
Arnab Kundu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Finite Temperature

Measurement-induced disturbance and thermal entanglement in a two-qutrit spin system with a uniaxial field

2016 ◽  
Vol 30 (24) ◽  
pp. 1650171
Author(s):  
Xue-Min Bai ◽  
Jun-Qi Li ◽  
J.-Q. Liang
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Significant Role ◽  
Spin System ◽  
Finite Temperature ◽  
Coupling Parameter ◽  
Nonlinear Coupling ◽  
Thermal Entanglement ◽  
Explicit Comparison ◽  
The Way

We investigate in this paper measurement-induced disturbance (MID) and negativity in a two-spin-qutrit model by considering the influence of the external magnetic field, nonlinear coupling parameter, the uniaxial field and temperature. It is shown that all of these parameters play a significant role in negativity and MID. We make an explicit comparison between the negativity and MID and disclose some interesting results. By the way, we find that negativity is a better measure than MID to detect the sudden point in a finite temperature, which is obviously different from the previous findings.

scholarly journals Entanglement and Entropy of a Three-Qubit System Interacting with a Quantum Spin Environment

2019 ◽  
Vol 9 (23) ◽  
pp. 5222
Author(s):  
Doaa Abo M. Abo-Kahla ◽  
Ahmed Farouk
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Analytical Solution ◽  
Information Entropy ◽  
Finite Temperature ◽  
Inverse Relationship ◽  
Quantum Spin ◽  
Coupling Constant ◽  
Qubit System ◽  
Spin Qubit

Throughout this paper, we describe an analytical solution for a three-qubit system characterized by a finite temperature within a thermodynamic limit influenced by a quantum spin environment. As applications to the presented solution, we investigate the effect of the temperature, the coupling constant ϵ 0 within the spin- qubit system and an external magnetic field on the three-particles residual entanglement N a b c , the concurrence C ( ρ ) , the information entropy H ( σ Z ) and the linear entropy P P ( t ) . The results show an inverse relationship between the entanglement and entropy, where the degree of both is controlled by controlling the temperature T and the coupling constant ϵ 0 .

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