Comparison of Perfect and Quasi Werner States

  title={Comparison of Perfect and Quasi Werner States},
  author={F. Siyouri and Fatima El Azzouzi},
In this paper, we investigate comparatively the behaviors of quantum discord and concurrence for Werner states based on two bipartite entangled squeezed states. The maximally entangled squeezed states are regarded as a perfect-Werner states, while the non-maximally entangled squeezed states are called quasi-Werner states. We show that, the behavior of the quantum correlations keep unchanged for these two types of states. However, the quantum correlations amount presents in perfect-Werner states… 
1 Citations

Figures from this paper

Wigner Function as a Detector of Entanglement in Open Two Coupled InAs Semiconductor Quantum Dots

We tested the ability of Wigner function to reveal and capture the quantum entanglement presents in two coupled semiconductor InAs quantum dots that independently interact with dephasing reservoirs.



Entanglement irreversibility from quantum discord and quantum deficit.

It is proved irreversibility of entanglement under local operations and classical communication for a family of entangled states for a generalization of the maximally correlated states.

Quantum discord for two-qubit X states

Quantum discord, a kind of quantum correlation, is defined as the difference between quantum mutual information and classical correlation in a bipartite system. In general, this correlation is

Entanglement versus quantum discord in two coupled double quantum dots

We study the dynamics of quantum correlations of two coupled double quantum dots containing two excess electrons. The dissipation is included through the contact with an oscillator bath. We solve the

Universal freezing of quantum correlations within the geometric approach

It is demonstrated from first principles that freezing of geometric quantum correlations is independent of the adopted distance and therefore universal, which paves the way to a deeper physical interpretation and future practical exploitation of the phenomenon for noisy quantum technologies.

Entanglement in many-body systems

Recent interest in aspects common to quantum information and condensed matter has prompted a flurry of activity at the border of these disciplines that were far distant until a few years ago.

Geometric picture of quantum discord for two-qubit quantum states

Among various definitions of quantum correlations, quantum discord has attracted considerable attention. To find an analytical expression for quantum discord is an intractable task. Exact results are

Distributed correlations and information flows within a hybrid multipartite quantum-classical system

Understanding the non-Markovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative

Preserving entanglement and nonlocality in solid-state qubits by dynamical decoupling

In this paper we study how to preserve entanglement and nonlocality under dephasing produced by classical noise with large low-frequency components, as $1/f$ noise, by Dynamical Decoupling

Classical and quantum correlations under decoherence

Recently some authors have pointed out that there exist nonclassical correlations which are more general, and possibly more fundamental, than entanglement. For these general quantum correlations and

Two-qubit entanglement dynamics for two different non-Markovian environments

We study the time behaviour of entanglement between two noninteracting qubits, each immersed in its own environment for two different non-Markovian conditions: a high-Q cavity slightly off-resonant