Thermal Entanglement Properties in Two Qubits One-Axis Spin Squeezing Model with an External Magnetic Field

2018 ◽  
Vol 58 (2) ◽  
pp. 399-402 ◽  
Author(s):  
Saeed Haddadi ◽  
Ahmad Akhound
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Squeezing ◽  
Thermal Entanglement ◽  
Spin Squeezing Model

THERMAL ENTANGLED QUANTUM REFRIGERATOR WORKING WITH THE TWO-QUBIT HEISENBERG XX MODEL

2012 ◽  
Vol 26 (11) ◽  
pp. 1250086
Author(s):  
JI-ZHOU HE ◽  
XIAN HE ◽  
JIE ZHENG
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Coefficient Of Performance ◽  
Thermodynamic Quantities ◽  
Thermal Entanglement ◽  
First Law Of Thermodynamics ◽  
Maximum Coefficient ◽  
Constant External Magnetic Field ◽  
Xx Model ◽  
Heisenberg Xx Model

An entangled quantum refrigerator working with a two-qubit Heisenberg XX model in a constant external magnetic field is constructed in this paper. Based on the quantum first law of thermodynamics, the expressions for several basic thermodynamic quantities such as the heat transferred, the net work and the coefficient of performance are derived. Moreover, the influence of the thermal entanglement on the basic thermodynamic quantities is investigated. Several interesting features of the variation of the basic thermodynamic quantities with the thermal entanglement in zero and nonzero magnetic field are obtained. Lastly, we analyze the maximum coefficient of performance.

Thermal entanglement in a mixed-spin Heisenberg XXZ model under a nonuniform external magnetic field

2009 ◽  
Vol 52 (12) ◽  
pp. 1919-1924 ◽  
Author(s):  
Fei Wang ◽  
HongHui Jia ◽  
HaiLiang Zhang ◽  
XueAo Zhang ◽  
ShengLi Chang
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Thermal Entanglement ◽  
Xxz Model ◽  
Mixed Spin ◽  
Heisenberg Xxz Model

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.

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