scholarly journals Understanding entanglement sudden death through multipartite entanglement and quantum correlations

2010 ◽  
Vol 43 (13) ◽  
pp. 135301 ◽  
Author(s):  
Jared H Cole
Keyword(s):  
Sudden Death ◽  
Quantum Correlations ◽  
Multipartite Entanglement ◽  
Entanglement Sudden Death

scholarly journals Local available quantum correlations for Bell Diagonal states and Markovian decoherence

2018 ◽  
Vol 64 (6) ◽  
pp. 662
Author(s):  
Hermann L Albrecht Q ◽  
Douglas F. Mundarain ◽  
Mario I. Caicedo S.
Keyword(s):  
Sudden Death ◽  
Quantum Discord ◽  
Quantum Correlations ◽  
Entanglement Sudden Death ◽  
Dissipative Dynamics ◽  
Phase Damping ◽  
Werner States ◽  
Kraus Operators

Local available quantum correlations (LAQCs), as dened by Mundarain et al. [19], are analytically determined for Bell Diagonal states. Using the Kraus operators formalism [10], we analyze the dissipative dynamics of 2-qubit LAQCs under Markovian decoherence. This is done for Werner states under the depolarizing [20] and phase damping channels [21]. Since Werner states are among those that exhibit the so called entanglement sudden death [27], the results are compared with the ones obtained for Quantum Discord [22], as analyzed by Werlang et al. [24], as well as for entanglement, i.e. Concurrence[7]. The LAQCs quantier, as Quantum Discord does, only vanishes asymptotically.

The dynamics of tripartite quantum correlations under Ornstein–Uhlenbeck noise

2018 ◽  
Vol 32 (31) ◽  
pp. 1850381 ◽  
Author(s):  
Jing Yang ◽  
Qi-Xiong Mu ◽  
Yan-Xia Huang
Keyword(s):  
Magnetic Field ◽  
Sudden Death ◽  
Quantum Correlation ◽  
Quantum Correlations ◽  
Time Limit ◽  
Entanglement Sudden Death ◽  
Thermal Entanglement ◽  
Short Time ◽  
The Magnetic Field ◽  
Markov Limit

The dynamics of the tripartite thermal entanglement measured by Negativity (N) and the tripartite quantum correlation described by measurement-induced disturbance (MID) under Ornstein–Uhlenbeck noise are investigated. This study has found that the tripartite N and MID can be preserved more effectively in the non-Markovian environment than in the short-time limit and the Markov limit cases. The short-time limit is a better approximation than the Markov limit. MID vanishes only in the asymptotic limit, while entanglement sudden death may occur, and the decreasing duration of MID far outweighs entanglement. This implies that MID is more robust than Negativity. As the noise bandwidth increases, the disentanglement time and the decay time of MID are significantly shorter. The increase of XZX[Formula: see text]+[Formula: see text]YZY three-site interaction is more effective than XZY−YZX three-site interaction to enhance Negativity and MID as well as the disentanglement time. The magnetic field diminishes Negativity and MID, but has no significant influence on the decreasing durations of both Negativity and MID.

QUANTUM CORRELATIONS OF TWO SPIN-1 PARTICLES IN THE OPTICAL LATTICE

2014 ◽  
Vol 28 (10) ◽  
pp. 1450049 ◽  
Author(s):  
JIA-DONG SHI ◽  
TAO WU ◽  
XUE-KE SONG ◽  
LIU YE
Keyword(s):  
Phase Transition ◽  
Sudden Death ◽  
Critical Point ◽  
Quantum Phase Transition ◽  
Finite Temperature ◽  
Optical Lattice ◽  
Quantum Correlations ◽  
Entanglement Sudden Death ◽  
Superfluid Phase ◽  
Dynamical Behaviors

In this paper, we investigate the dynamical behaviors of quantum correlations witnessed by geometric discord and negativity when two three-level spin-1 atoms exist in the optical lattice. The results show that the GD can detect the critical point K = J at finite temperature associated with the quantum phase transition which separates the superfluid phase from the Mott insulator phase, while the negativity cannot. In addition, the system undergoes an entanglement sudden death (ESD), but the GD always exists, meanwhile, the GD is more robust than negativity against temperature T.

BIPARTITE AND MULTIPARTITE CORRELATIONS OF COUPLED QUBITS IN A NON-MARKOVIAN ENVIRONMENT: HIERARCHY EQUATION METHOD

2013 ◽  
Vol 11 (06) ◽  
pp. 1350058 ◽  
Author(s):  
JIAN-SONG ZHANG ◽  
ZHI-YUAN HUANG ◽  
AI-XI CHEN
Keyword(s):  
Quantum Information ◽  
Sudden Death ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Spin Squeezing ◽  
Equation Method ◽  
Entanglement Sudden Death ◽  
Markovian Approximations ◽  
Rotating Wave ◽  
Coupled Qubits

We study bipartite and multipartite correlations of several coupled qubits within a common non-Markovian bath using the hierarchy equation method. This method does not use the rotating-wave and Born–Markovian approximations. The interaction between the qubits and their coupling strength with the bath have remarkable influence on the dynamics of quantum correlations. The entanglement sudden death (ESD) phenomenon, the amount of stationary state concurrence and spin squeezing can be controled by the non-Markovianity of the environment and interactions between qubits. These properties may be useful for purposes of quantum information processing with multiqubit system in non-Markovian environments.

scholarly journals Manipulation of entanglement sudden death in an all-optical setup

2017 ◽  
Vol 34 (3) ◽  
pp. 681 ◽  
Author(s):  
Ashutosh Singh ◽  
Siva Pradyumna ◽  
A. R. P. Rau ◽  
Urbasi Sinha
Keyword(s):  
Sudden Death ◽  
Entanglement Sudden Death ◽  
Optical Setup ◽  
All Optical

Coherent state quantum key distribution based on entanglement sudden death

2015 ◽  
Vol 15 (3) ◽  
pp. 1117-1133
Author(s):  
Gregg Jaeger ◽  
David Simon ◽  
Alexander V. Sergienko
Keyword(s):  
Sudden Death ◽  
Coherent State ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entanglement Sudden Death

Entanglement sudden death via two-photon processes in cavity QED

2009 ◽  
Vol 42 (19) ◽  
pp. 195507 ◽  
Author(s):  
W B Cardoso ◽  
A T Avelar ◽  
B Baseia ◽  
N G de Almeida
Keyword(s):  
Sudden Death ◽  
Cavity Qed ◽  
Entanglement Sudden Death ◽  
Two Photon

Quantum correlations and coherence dynamics in qutrit–qutrit systems under mixed classical environmental noises

2017 ◽  
Vol 15 (06) ◽  
pp. 1750047 ◽  
Author(s):  
Tsamouo Tsokeng Arthur ◽  
Tchoffo Martin ◽  
Lukong Cornelius Fai
Keyword(s):  
Sudden Death ◽  
Quantum Discord ◽  
Quantum Correlations ◽  
Collective Effects ◽  
Markovian Environment ◽  
Dynamic Noise ◽  
Long Time ◽  
Noise Models ◽  
Markovian Regime ◽  
Static Noise

We investigate the dynamics of entanglement, quantum discord (QD) and state coherence in a bipartite and noninteracting spin-qutrits system under mixed classical noises. Specifically, the collective effects of static noise (SN) and random telegraphic noise (RTN) each being coupled with a marginal system, are analyzed. While the static noise models a non-Markovian environment, the dynamic noise can model both a Markovian or a non-Markovian environment, and both dynamics are studied. We show that quantum correlations and coherence may survive the noise degrading effects at sufficiently long time when the Markovian regime of the RTN is considered. Meanwhile, the opposite is found in the non-Markovian regime, wherein the nonmonotonic dynamics of quantum features avoid sudden death phenomena. However, the static noise is more fatal to the survival of quantum correlations and quantum state coherence as compared to the RTN.

scholarly journals Entanglement-breaking channels and entanglement sudden death

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
Laura T. Knoll ◽  
Christian T. Schmiegelow ◽  
Osvaldo Jiménez Farías ◽  
Stephen P. Walborn ◽  
Miguel A. Larotonda
Keyword(s):  
Sudden Death ◽  
Entanglement Sudden Death
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