Evolution from entanglement to decoherence

2007 ◽  
Vol 7 (5&6) ◽  
pp. 459-468 ◽  
Author(s):  
T. Yu ◽  
J.H. Eberly
Keyword(s):  
Sudden Death ◽  
Time Evolution ◽  
Early Stage ◽  
Environmental Noise ◽  
Entanglement Sudden Death ◽  
Mixed States

We examine a class of bipartite mixed states which we call X states and report several analytic results related to the occurrence of early-stage decoherence or so-called entanglement sudden death (ESD) under time evolution in the presence of common types of environmental noise. Avoidance of sudden death by application of purely local operations is shown to be feasible in some cases.

A NEW FEATURE ON THE SUDDEN DEATH OF ENTANGLEMENT

2008 ◽  
Vol 22 (25) ◽  
pp. 2503-2508 ◽  
Author(s):  
XUE-QUN YAN
Keyword(s):  
Sudden Death ◽  
Time Evolution ◽  
Analytic Solution ◽  
Time Interval ◽  
Entanglement Sudden Death ◽  
Mixed States ◽  
Initial States ◽  
New Feature

Based on the exactly analytic solution obtained of the intensity-dependent Jaynes–Cummings model for a certain class of initial entangled mixed states, we explore the time evolution of the entanglement between two atoms, initially non-locally correlated and separately interacting with two distinct cavities. The results show that entanglement sudden death is dependent on the different initial states of atoms, and the length of the time interval for the zero entanglement is invariant for a certain class of initial mixed states.

DYNAMICAL SUPPRESSION OF ENTANGLEMENT SUDDEN DEATH IN A JAYNES–CUMMINGS MODEL EXTENDED

2009 ◽  
Vol 23 (02) ◽  
pp. 163-169
Author(s):  
XUE-QUN YAN
Keyword(s):  
Sudden Death ◽  
Time Evolution ◽  
Electromagnetic Pulse ◽  
Atomic Motion ◽  
Single Atom ◽  
Entanglement Sudden Death ◽  
Mode Structure ◽  
Elementary Model ◽  
Finite Duration

The Jaynes–Cummings model extended by the inclusion of mode structure and atomic motion is an elementary model that describes the interaction between a single atom and electromagnetic pulse. Based on the model, we explore the time evolution of the entanglement between two atoms, initially non-locally correlated and crossing separately two distinct cavities. Our results show that this model suggests a strategy to fight against the so-called entanglement sudden death, and in the situation resurrection of the original entanglement value occurs periodically and the entanglement will remain at the original value for a finite duration.

scholarly journals Effects of quantum error correction on entanglement sudden death

2014 ◽  
Vol 14 (1&2) ◽  
pp. 39-55
Author(s):  
Muhammed Yonac ◽  
Joseph H. Eberly
Keyword(s):  
Sudden Death ◽  
Error Correction ◽  
Quantum Coherence ◽  
Early Stage ◽  
Entanglement Sudden Death ◽  
Mixing Angle ◽  
Phase Damping ◽  
Pure Phase ◽  
Non Local ◽  
Quantum Error

We investigate the effects of error correction on non-local quantum coherence as a function of time, extending the study by Sainz and Bjork. We consider error correction of amplitude damping, pure phase damping and combinations of amplitude and phase damping as they affect both fidelity and quantum entanglement. Initial two-qubit entanglement is encoded in arbitrary real superpositions of both $\Phi$-type and $\Psi$-type Bell states. Our main focus is on the possibility of delay or prevention of ESD (early stage decoherence, or entanglement sudden death). We obtain the onset times for ESD as a function of the state-superposition mixing angle. Error correction affects entanglement and fidelity differently, and we exhibit initial entangled states for which error correction increases fidelity but decreases entanglement, and vice versa.

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

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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