Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states

2013 ◽  
Author(s):  
E. Castro ◽  
R. Gómez ◽  
C. L. Ladera ◽  
A. Zambrano
Keyword(s):  
Coherent States ◽  
Quantum Discord ◽  
Weak Measurement ◽  
Werner States ◽  
Entangled Coherent States

Improvement of quantum correlations by repetitive quantum error correction

2019 ◽  
Vol 17 (05) ◽  
pp. 1950044
Author(s):  
A. El Allati ◽  
H. Amellal ◽  
A. Meslouhi
Keyword(s):  
Error Correction ◽  
Quantum Correlation ◽  
Coherent States ◽  
Quantum Discord ◽  
Error Correcting Code ◽  
Quantum Correlations ◽  
Quantum Error Correction ◽  
Optical Field ◽  
Quantum Error ◽  
Entangled Coherent States

A quantum error-correcting code is established in entangled coherent states (CSs) with Markovian and non-Markovian environments. However, the dynamic behavior of these optical states is discussed in terms of quantum correlation measurements, entanglement and discord. By using the correcting codes, these correlations can be as robust as possible against environmental effects. As the number of redundant CSs increases due to the repetitive error correction, the probabilities of success also increase significantly. Based on different optical field parameters, the discord can withstand more than an entanglement. Furthermore, the behavior of quantum discord under decoherence may exhibit sudden death and sudden birth phenomena as functions of dimensionless parameters.

scholarly journals QUANTUM DISCORD FOR MULTIPARTITE COHERENT STATES INTERPOLATING BETWEEN WERNER AND GREENBERGER–HORNE–ZEILINGER STATES

2012 ◽  
Vol 10 (05) ◽  
pp. 1250060 ◽  
Author(s):  
M. DAOUD ◽  
R. AHL LAAMARA
Keyword(s):  
Quantum System ◽  
Ground State ◽  
Coherent States ◽  
Quantum Discord ◽  
Temporal Evolution ◽  
Conditional Entropy ◽  
Quantum Correlations ◽  
Ghz States ◽  
Werner States ◽  
Explicit Expressions

The quantum discord is used as measure of quantum correlations for two families of multipartite coherent states. The first family interpolates between generalized GHZ states and generalized Werner states. The second one is an interpolation between generalized GHZ and the ground state of the multipartite quantum system. Two inequivalent ways to split the system in a pair of qubits are introduced. The explicit expressions of quantum quantum discord in multipartite coherent states are derived. Its evaluation uses the Koashi–Winter relation in optimizing the conditional entropy. The temporal evolution of quantum correlations (quantum discord and entanglement) is also discussed.

scholarly journals Bipartite quantum channels using multipartite cluster-type entangled coherent states

2010 ◽  
Vol 81 (4) ◽  
Author(s):  
P. P. Munhoz ◽  
J. A. Roversi ◽  
A. Vidiella-Barranco ◽  
F. L. Semião
Keyword(s):  
Coherent States ◽  
Quantum Channels ◽  
Cluster Type ◽  
Entangled Coherent States

scholarly journals Entangled coherent states under dissipation

2010 ◽  
Vol 283 (19) ◽  
pp. 3825-3829 ◽  
Author(s):  
F. Lastra ◽  
G. Romero ◽  
C.E. López ◽  
N. Zagury ◽  
J.C. Retamal
Keyword(s):  
Coherent States ◽  
Entangled Coherent States

Generation of cluster-type entangled coherent states using weak nonlinearities

2011 ◽  
Vol 11 (1&2) ◽  
pp. 124-141
Author(s):  
Nguyen B. An ◽  
Kisik Kim ◽  
Jaewan Kim
Keyword(s):  
Coherent States ◽  
Single Photon ◽  
Optical Devices ◽  
Phase Shifters ◽  
Intense Laser ◽  
Laser Beams ◽  
Beam Splitters ◽  
Photo Detectors ◽  
Cluster Type ◽  
Entangled Coherent States

We propose a scheme to generate a recently introduced type of entangled coherent states using realistic weak cross-Kerr nonlinearities and intense laser beams. An intense laser can be filtered to make a faint one to be used for production of a single photon which is necessary in our scheme. The optical devices used are conventional ones such as interferometer, mirrors, beam-splitters, phase-shifters and photo-detectors. We also provide a detailed analysis on the effects of possible imperfections and decoherence showing that our scheme is robust against such effects.

Entangled Coherent States with Variable Weighting

1993 ◽  
Vol 40 (10) ◽  
pp. 1923-1937 ◽  
Author(s):  
Bruce Wielinga ◽  
Barry C. Sanders
Keyword(s):  
Coherent States ◽  
Variable Weighting ◽  
Entangled Coherent States
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