Dynamic Characteristics of Super Quantum Discord in Thermal Environment

2020 ◽  
Vol 10 (06) ◽  
pp. 131-139
Author(s):  
梅 白
Keyword(s):  
Dynamic Characteristics ◽  
Quantum Discord ◽  
Thermal Environment ◽  
Super Quantum Discord

scholarly journals Influence of CNTs grading and reinforcement on dynamic characteristics of composite Plates in thermal environment

2021 ◽  
Vol 1123 (1) ◽  
pp. 012052
Author(s):  
Vasuraj Garg ◽  
Sanidhya Saxena ◽  
Gaurav Goyal ◽  
Sourabh Kumar Soni ◽  
Benedict Thomas
Keyword(s):  
Dynamic Characteristics ◽  
Thermal Environment ◽  
Composite Plates

Super-quantum discord with weak measurement in circuit QED

Optik ◽  
2016 ◽  
Vol 127 (18) ◽  
pp. 7180-7187
Author(s):  
Yinghua Ji ◽  
Baogen Deng ◽  
Juju Hu
Keyword(s):  
Quantum Discord ◽  
Weak Measurement ◽  
Circuit Qed ◽  
Super Quantum Discord

Super quantum discord and other correlations for tripartite GHZ-type squeezed states

2015 ◽  
Vol 67 (2) ◽  
pp. 311-317 ◽  
Author(s):  
S. Rfifi ◽  
F. Siyouri ◽  
M. El Baz ◽  
Y. Hassouni
Keyword(s):  
Quantum Discord ◽  
Squeezed States ◽  
Super Quantum Discord

scholarly journals Super Quantum Discord for X-type States

2014 ◽  
Vol 54 (2) ◽  
pp. 680-688 ◽  
Author(s):  
Tao Li ◽  
Teng Ma ◽  
Yaokun Wang ◽  
Shaoming Fei ◽  
Zhixi Wang
Keyword(s):  
Quantum Discord ◽  
Super Quantum Discord

scholarly journals Quantum Entanglement and Quantum Discord of Two-Mode Gaussian States in a Thermal Environment

2011 ◽  
Vol 18 (02) ◽  
pp. 175-190 ◽  
Author(s):  
Aurelian Isar
Keyword(s):  
Sudden Death ◽  
Time Evolution ◽  
Quantum Entanglement ◽  
Quantum Discord ◽  
Thermal Environment ◽  
Quantum Correlations ◽  
Entangled State ◽  
Gaussian State ◽  
Thermal Bath ◽  
Bipartite State

In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we give a description of the continuous-variable quantum entanglement and quantum discord for a system consisting of two noninteracting modes embedded in a thermal environment. Entanglement and discord are used to quantify the quantum correlations of the system. For all values of the temperature of the thermal reservoir, an initially separable Gaussian state remains separable for all times. We study the time evolution of logarithmic negativity, which characterizes the degree of entanglement, and we show that in the case of an entangled initial Gaussian state, entanglement suppression (entanglement sudden death) takes place for non-zero temperatures of the environment. Only for zero temperature of the thermal bath the initial entangled state remains entangled for finite times. We analyze time evolution of Gaussian quantum discord, which is a measure of all quantum correlations in the bipartite state, including entanglement, and we show that quantum discord decays asymptotically in time under the effect of thermal bath. This is in contrast with the sudden death of entanglement. Before the suppression of entanglement, the qualitative evolution of quantum discord is very similar to that of the entanglement. We describe also time evolution of the degree of classical correlations and of quantum mutual information, which measures the total correlations of quantum system.

Stability of two interacting entangled spins interacting with a thermal environment

2016 ◽  
Vol 16 (15&16) ◽  
pp. 1365-1378
Author(s):  
S. Dehdashti ◽  
M. B. Harouni ◽  
Z. Harsij ◽  
J. Shen ◽  
H. Wang ◽  
...  
Keyword(s):  
Quantum Correlation ◽  
Quantum Discord ◽  
Thermal Environment ◽  
Harmonic Oscillators ◽  
Present System ◽  
Spin States ◽  
Entanglement Dynamics ◽  
Common Environment ◽  
The Common ◽  
Increasing Temperature

We study the entanglement dynamics of two entangled spins coupled with a common environment consisting of a large number of harmonic oscillators. Specifically, we study the impacts of both interaction and temperature of the environment on the dynamic quantum correlation, namely, entanglement and quantum discord of two spins via concurrence and global quantum discord criteria. In the present system, we show that the interaction between the spin sub-systems and the common environment causes environmental states to approach a composition of even and odd coherent states, which have different phases, and which are entangled with the spin states. Moreover, using the thermofield approach, we demonstrate quantum correlation stabilization as a result of increasing environmental interaction as well as increasing temperature.

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