Quantum discord for a central two-qubit system coupled to anXY-spin-chain environment

2010 ◽  
Vol 82 (6) ◽  
Author(s):  
Ben-Qiong Liu ◽  
Bin Shao ◽  
Jian Zou
Keyword(s):  
Spin Chain ◽  
Quantum Discord ◽  
Qubit System

Quantum discord for a central two-qubit system coupled to an XY spin chain with multipartite interaction

2012 ◽  
Vol 46 ◽  
pp. 218-223 ◽  
Author(s):  
Liang Qiu ◽  
Gang Tang ◽  
Kui Han ◽  
Xian Qing Yang ◽  
Yu Xi Wu ◽  
...  
Keyword(s):  
Spin Chain ◽  
Quantum Discord ◽  
Qubit System ◽  
Xy Spin Chain

Effectiveness of Non-Markovian Methods for Quantum Discord Dynamics of Non-coupled Two-Qubit System

2018 ◽  
Vol 70 (3) ◽  
pp. 268 ◽  
Author(s):  
Yong-Gang Huang ◽  
Xiao-Yun Wang ◽  
Xue-Xian Yang ◽  
Ke Deng ◽  
Jin-Zhang Peng ◽  
...  
Keyword(s):  
Quantum Discord ◽  
Qubit System

Frozen Quantum Coherence for a Central Two-Qubit System in a Spin-Chain Environment

2018 ◽  
Vol 35 (8) ◽  
pp. 080301
Author(s):  
Yang Yang ◽  
An-Min Wang ◽  
Lian-Zhen Cao ◽  
Jia-Qiang Zhao ◽  
Huai-Xin Lu
Keyword(s):  
Spin Chain ◽  
Quantum Coherence ◽  
Qubit System

scholarly journals Effects of phase shift on bipartite and multipartite correlations of a spin chain under dephasing

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Ai-Xi Chen ◽  
Jian-Song Zhang
Keyword(s):  
Steady State ◽  
Phase Shift ◽  
Analytical Solution ◽  
Spin Chain ◽  
Quantum Discord ◽  
Present Model ◽  
Spin Squeezing ◽  
Heisenberg Chain ◽  
Initial Correlations ◽  
Long Time

AbstractWe investigate the effects of phase shift on entanglement, quantum discord, geometric discord, and spinsqueezing of a Heisenberg chain under dephasing. An analytical solution of the present model is obtained. Our results show that the initial correlations of the spin chain could be partially stored for a long time in the presence of dephasing and the amount of steady state correlations can be adjusted via phase shift. Particularly, we find the effects of phase shift on quantum discord and geometric discord are not always the same, i.e., the increase of geometric discord does not always imply the increase of quantum discord. Then, we calculate the spin-squeezing of the spin chain and find that spin-squeezing first increases with time and then reaches a plateau. The amount of spin-squeezing can be controlled via phase shift.

scholarly journals Dynamics of entanglement and non-classical correlation for four-qubit GHZ state

2015 ◽  
Vol 13 (06) ◽  
pp. 1550044 ◽  
Author(s):  
P. Espoukeh ◽  
R. Rahimi ◽  
S. Salimi ◽  
P. Pedram
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Discord ◽  
Quantum Information Processing ◽  
Ghz State ◽  
Classical Correlation ◽  
Qubit System ◽  
The Many ◽  
Sudden Transition

Many-qubit entanglement is crucial for quantum information processing although its exploitation is hindered by the detrimental effects of the environment surrounding the many-qubit system. It is thus of importance to study the dynamics of general multipartite non-classical correlation, including but not restricted to entanglement, under noise. We did this study for four-qubit Greenberger–Horne–Zeilinga (GHZ) state under most common noises in an experiment and found that non-classical correlation is more robust than entanglement except when it is imposed to dephasing channel. Quantum discord presents a sudden transition in its dynamics for Pauli-X and Pauli-Y noises as well as Bell-diagonal states interacting with dephasing reservoirs and it decays monotonically for Pauli-Z and isotropic noises.

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