scholarly journals Decoherence assisted spin squeezing generation in superposition of tripartite GHZ and W states

2019 ◽  
Vol 198 ◽  
pp. 00015
Author(s):  
Kapil K. Sharma ◽  
Swaroop Ganguly
Keyword(s):  
Spin Squeezing ◽  
Spin Vector ◽  
Amplitude Damping ◽  
W States ◽  
Phase Damping ◽  
The Mean

In the present paper, we study spin squeezing under decoherence in the superposition of tripartite maximally entangled GHZ and W states. Here we use amplitude damping, phase damping and depolarisation channel. We have investigated the dynamics of spin squeezing with the interplay of super-position and decoherence parameters with different directions of the mean spin vector. We have found the mixture of GHZ and W states is robust against spin squeezing generation for amplitude damping and phase damping channels for certain directions of the mean spin vector. However, the depolarisation channel performs well for spin squeezing generation and generates permanent spin squeezing in the superposition of GHZ and W states.

scholarly journals Polarization in relativistic heavy ion collisions: a theoretical perspective

2018 ◽  
Vol 171 ◽  
pp. 07001 ◽  
Author(s):  
Francesco Becattini
Keyword(s):  
Heavy Ion Collisions ◽  
Theoretical Perspective ◽  
Heavy Ion ◽  
Hydrodynamical Model ◽  
Relativistic Heavy Ion Collisions ◽  
Spin Vector ◽  
Ion Collisions ◽  
The Mean ◽  
Theoretical Issues ◽  
Covariant Decomposition

We review the theoretical framework for the calculation of particle polarization in relativistic heavy ion collisions within the hydrodynamical model. The covariant decomposition of the mean spin vector is presented and open theoretical issues addressed.

Entanglement criteria for the three-qubit states

2017 ◽  
Vol 15 (07) ◽  
pp. 1750049 ◽  
Author(s):  
Y. Akbari-Kourbolagh
Keyword(s):  
White Noise ◽  
Tensor Products ◽  
W State ◽  
Entangled States ◽  
Mean Values ◽  
W States ◽  
Pauli Matrices ◽  
The Mean ◽  
Simple Sets ◽  
Qubit States

We present sufficient criteria for the entanglement of three-qubit states. For some special families of states, the criteria are also necessary for the entanglement. They are formulated as simple sets of inequalities for the mean values of certain observables defined as tensor products of Pauli matrices. The criteria are good indicators of the entanglement in the vicinity of three-qubit GHZ and W states and enjoy the capability of detecting the entangled states with positive partial transpositions. Furthermore, they improve the best known result for the case of W state mixed with the white noise. The efficiency of the criteria is illustrated through several examples.

CURRENTS, SPIN DENSITIES AND MEAN-FIELD FORM FACTORS IN ROTATING NUCLEI: A SEMI-CLASSICAL APPROACH

2004 ◽  
Vol 13 (01) ◽  
pp. 225-233 ◽  
Author(s):  
J. BARTEL ◽  
K. BENCHEIKH ◽  
P. QUENTIN
Keyword(s):  
Mean Field ◽  
Form Factors ◽  
Spin Vector ◽  
Self Consistent ◽  
Field Form ◽  
Local Densities ◽  
The Mean ◽  
Self Consistency ◽  
Spin Densities ◽  
Rotating Nuclei

We present self-consistent semi-classical local densities characterising the structure of rotating nuclei. A particular emphasis is put on those densities which are generated by the breaking of time-reversal symmetry through the cranking piece of the Routhian, namely the current density and the spin vector density. Our approach which is based on the Extended-Thomas-Fermi method goes beyond the Inglis cranking approach and contains naturally the Thouless-Valatin self-consistency terms expressing the response of the mean field to the time-odd part of the density matrix.

Mean spin direction and spin squeezing in superpositions of spin coherent states

Open Physics ◽  
2007 ◽  
Vol 5 (3) ◽  
Author(s):  
Dong Yan ◽  
Xiaoguang Wang ◽  
Lijun Song ◽  
Zhanguo Zong
Keyword(s):  
Coherent States ◽  
Relative Phase ◽  
Azimuthal Angle ◽  
Spin Squeezing ◽  
Spin Direction ◽  
The Mean ◽  
Mean Spin Direction ◽  
Spin Coherent States

AbstractWe consider the mean spin direction (MSD) of superpositions of two spin coherent states (SCS) | ± μ〉, and superpositions of | μ〉 and | μ*〉 with a relative phase. We find that the azimuthal angle exhibits a π transition for both states when we vary the relative phase. The spin squeezing of the states, and the bosonic counterpart of the mean spin direction are also discussed.

Spin Squeezing in Superpositions of GHZ State and W States

2012 ◽  
Vol 51 (9) ◽  
pp. 2960-2965 ◽  
Author(s):  
Xiao-Jie Yi ◽  
Guo-Qiang Huang ◽  
Jian-Min Wang
Keyword(s):  
Spin Squeezing ◽  
Ghz State ◽  
W States

Entanglement Properties of Werner State through the Amplitude Damping and Phase Damping Channels

2014 ◽  
Vol 20 (1) ◽  
pp. 35-39
Author(s):  
廖庆洪 LIAO Qing-hong ◽  
刘欣 LIU Xin ◽  
刘树田 LIU Shu-tian
Keyword(s):  
Werner State ◽  
Amplitude Damping ◽  
Phase Damping

Effect of Noise on Practical Quantum Communication Systems

2016 ◽  
Vol 66 (2) ◽  
pp. 186 ◽  
Author(s):  
Vishal Sharma
Keyword(s):  
Quantum Key Distribution ◽  
Communication Systems ◽  
Quantum Communication ◽  
Practical Implementation ◽  
Collective Noise ◽  
Noisy Channels ◽  
Amplitude Damping ◽  
Phase Damping ◽  
Noise Models

<p>Entanglement is an important resource for various applications of quantum computation. Another important endeavor is to establish the role of entanglement in practical implementation where system of interest is affected by various kinds of noisy channels. Here, a single classical bit is used to send information under the influence of a noisy quantum channel. The entanglement content of quantum states is computed under noisy channels such as amplitude damping, phase damping, squeesed generalised amplitude damping, Pauli channels and various collective noise models on the protocols of quantum key distribution.</p><p> </p>

scholarly journals JRSP of three-particle state via three tripartite GHZ class in quantum noisy channels

2016 ◽  
Vol 14 (07) ◽  
pp. 1650034 ◽  
Author(s):  
Babatunde James Falaye ◽  
Guo-Hua Sun ◽  
Oscar Camacho-Nieto ◽  
Shi-Hai Dong
Keyword(s):  
Information Loss ◽  
Particle State ◽  
Joint Remote State Preparation ◽  
Noisy Channels ◽  
Amplitude Damping ◽  
Phase Damping ◽  
Special Cases ◽  
Point Of Departure ◽  
Depolarizing Channel ◽  
Quantum Noisy Channels

We present a scheme for joint remote state preparation (JRSP) of three-particle state via three tripartite Greenberger–Horne–Zeilinger (GHZ) entangled states as the quantum channel linking the parties. We use eight-qubit mutually orthogonal basis vector as measurement point of departure. The likelihood of success for this scheme has been found to be [Formula: see text]. However, by putting some special cases into consideration, the chances can be ameliorated to [Formula: see text] and 1. The effects of amplitude-damping noise, phase-damping noise and depolarizing noise on this scheme have been scrutinized and the analytical derivations of fidelities for the quantum noisy channels have been presented. We found that for [Formula: see text], the states conveyed through depolarizing channel lose more information than phase-damping channel while the information loss through amplitude damping channel is most minimal.

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