scholarly journals Entanglement Sudden Death and Birth Effects in Two Qubits Maximally Entangled Mixed States Under Quantum Channels

2019 ◽  
Vol 59 (2) ◽  
pp. 403-414 ◽  
Author(s):  
Kapil K. Sharma ◽  
Vladimir P. Gerdt
Keyword(s):  
Sudden Death ◽  
Entanglement Sudden Death ◽  
Quantum Channels ◽  
Mixed States

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.

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

scholarly journals Construction of genuinely entangled subspacesand the associated bounds on entanglement measures for mixed states

2021 ◽  
Author(s):  
Konstantin Antipin
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Lower Bounds ◽  
Quantum Information Processing ◽  
Multipartite Entanglement ◽  
Quantum Channels ◽  
Valuable Resource ◽  
Mixed States ◽  
Entanglement Measures ◽  
Pure States

Abstract Genuine entanglement is the strongest form of multipartite entanglement. Genuinely entangled pure states contain entanglement in every bipartition and as such can be regarded as a valuable resource in the protocols of quantum information processing. A recent direction of research is the construction of genuinely entangled subspaces — the class of subspaces consisting entirely of genuinely entangled pure states. In this paper we present methods of construction of such subspaces including those of maximal possible dimension. The approach is based on the composition of bipartite entangled subspaces and quantum channels of certain types. The examples include maximal subspaces for systems of three qubits, four qubits, three qutrits. We also provide lower bounds on two entanglement measures for mixed states, the concurrence and the convex-roof extended negativity, which are directly connected with the projection on genuinely entangled subspaces.

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

scholarly journals DECAY OF COHERENCE AND ENTANGLEMENT OF A SUPERPOSITION STATE FOR A CONTINUOUS VARIABLE SYSTEM IN AN ARBITRARY HEAT BATH

2010 ◽  
Vol 08 (05) ◽  
pp. 755-763
Author(s):  
G. W. FORD ◽  
R. F. O'CONNELL
Keyword(s):  
Sudden Death ◽  
Heat Bath ◽  
Continuous Variable ◽  
Time Development ◽  
Gaussian State ◽  
Entanglement Sudden Death ◽  
Equation Approach ◽  
Superposition State ◽  
Master Equation Approach ◽  
Non Gaussian

We consider the case of a pair of particles initially in a superposition state corresponding to a separated pair of wave packets. In contrast to a previous related work, we avoid a master equation approach and we calculate exactly the time development of this non-Gaussian state due to interaction with an arbitrary heat bath. We find that coherence decays continuously, as expected. We then investigate entanglement and find that at a finite time the system becomes separable (not entangled). Thus, we see that entanglement sudden death is also prevalent in continuous variable systems which should raise concern for the designers of entangled systems.

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