scholarly journals Generation of Gaussian quantum discord of two bosonic modes in a thermal environment

2017 ◽  
Author(s):  
Tatiana Mihaescu ◽  
Aurelian Isar
Keyword(s):  
Quantum Discord ◽  
Thermal Environment ◽  
Gaussian Quantum Discord

Gaussian quantum discord and EPR steering in optomechanical system

Optik ◽  
2018 ◽  
Vol 158 ◽  
pp. 1186-1193 ◽  
Author(s):  
M. Amazioug ◽  
M. Nassik ◽  
N. Habiballah
Keyword(s):  
Quantum Discord ◽  
Optomechanical System ◽  
Gaussian Quantum Discord ◽  
Epr Steering

scholarly journals Overarching framework between Gaussian quantum discord and Gaussian quantum illumination

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
Mark Bradshaw ◽  
Syed M. Assad ◽  
Jing Yan Haw ◽  
Si-Hui Tan ◽  
Ping Koy Lam ◽  
...  
Keyword(s):  
Quantum Discord ◽  
Gaussian Quantum Discord

scholarly journals THE BALANCE OF QUANTUM CORRELATIONS FOR A CLASS OF FEASIBLE TRIPARTITE CONTINUOUS VARIABLE STATES

2012 ◽  
Vol 27 (01n03) ◽  
pp. 1345024 ◽  
Author(s):  
STEFANO OLIVARES ◽  
MATTEO G. A. PARIS
Keyword(s):  
Conservation Laws ◽  
Quantum Discord ◽  
Quantum Correlations ◽  
Continuous Variable ◽  
Noisy Environment ◽  
Mixed States ◽  
Von Neumann ◽  
Entanglement Of Formation ◽  
Pure States ◽  
Gaussian Quantum Discord

We address the balance of quantum correlations for continuous variable (CV) states. In particular, we consider a class of feasible tripartite CV pure states and explicitly prove two Koashi–Winter-like conservation laws involving Gaussian entanglement of formation (EoF), Gaussian quantum discord and sub-system Von Neumann entropies. We also address the class of tripartite CV mixed states resulting from the propagation in a noisy environment, and discuss how the previous equalities evolve into inequalities.

scholarly journals Remote transfer of Gaussian quantum discord

2014 ◽  
Vol 22 (13) ◽  
pp. 15894 ◽  
Author(s):  
Lingyu Ma ◽  
Xiaolong Su
Keyword(s):  
Quantum Discord ◽  
Gaussian 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.

scholarly journals Homodyne Estimation of Gaussian Quantum Discord

2012 ◽  
Vol 109 (18) ◽  
Author(s):  
Rémi Blandino ◽  
Marco G. Genoni ◽  
Jean Etesse ◽  
Marco Barbieri ◽  
Matteo G. A. Paris ◽  
...  
Keyword(s):  
Quantum Discord ◽  
Gaussian Quantum Discord
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