scholarly journals Multipartite Disentanglement Dynamics Due Simultaneously to Amplitude Damping and Phase Damping

2009 ◽  
Vol 19 (4) ◽  
Author(s):  
Nguyen Ba An
Keyword(s):  
Detailed Analysis ◽  
Parameter Space ◽  
Finite Time ◽  
Amplitude Damping ◽  
Phase Damping ◽  
Local Environments ◽  
Combined Action ◽  
Will Force

We present a detailed analysis on disentanglement dynamics of multiqubit GHZ-type states whose qubits are remotely located in absence of any mutual interactions. The dynamics is thus induced by independent local environments surrounding each qubit. It has recently been known that if each qubit is subjected solely to the phase damping then the state's entanglement vanishes asymptotically in time and if only the amplitude damping is active then the state's entanglement may vanish suddenly in certain parameter subspace. In this paper, we shall show that a combined action of both the phase damping and the amplitude damping will force the state's entanglement to always vanish suddenly in the entire parameter space. Furthermore, we shall prove that by proper local operations such a finite-time disentanglement can be avoided for whatever state's parameters, no matter the phase damping and the amplitude damping act severally or in combination.

scholarly journals Freezing dynamics of entanglement and nonlocality for qutrit-qutrit (3 ⊗ 3) quantum systems

2019 ◽  
Vol 34 (13) ◽  
pp. 1950102 ◽  
Author(s):  
Mazhar Ali
Keyword(s):  
Finite Time ◽  
Quantum Systems ◽  
Quantum States ◽  
Multipartite Quantum Systems ◽  
Combined Action ◽  
Time Invariant ◽  
Decoherence Free Subspaces

We examine the possibilities of nontrivial phenomena of time-invariant entanglement and freezing dynamics of entanglement for qutrit-qutrit quantum systems. We find no evidence for time-invariant entanglement, however, we do observe that certain quantum states freeze their entanglement after decaying for some time. It is interesting that quantum states are changing whereas their entanglement remains constant. We find that the combined action of decoherence free subspaces and subspaces where quantum states decay, facilitate this phenomenon. This study is an extension of similar phenomena observed for qubit-qubit systems, qubit-qutrit, and multipartite quantum systems. We examine nonlocality of a specific family of states and find the certain instances where the states still remain entangled, however, they can either loose their nonlocality at a finite time or remain nonlocal for all times.

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 Sparticle Masses in a Supersymmetric Grand Unified Model

2011 ◽  
Vol 21 (1) ◽  
pp. 11
Author(s):  
Tran Minh Hieu
Keyword(s):  
Detailed Analysis ◽  
Supersymmetry Breaking ◽  
Parameter Space ◽  
Free Parameter ◽  
Phenomenological Study ◽  
Unified Model ◽  
Parameter Determination ◽  
Phenomenological Aspect

In this paper, we investigate the phenomenological aspect relevant to the sparticle masses of a supersymmetric grand unified model, in which the $SU(5)$ is used as the grand unified group with the minimal particle contents and supersymmetry breaking is mediated by the so-called gaugino mediation mechanism. A detailed analysis about the dependence of the squarks and sleptons masses on the free parameter space is given, and shown to be useful for the collider phenomenological study and parameter determination for future experiments.

An Infrared Study of Metal Isopropoxide Precursors for SrTiO3

1984 ◽  
Vol 32 ◽  
Author(s):  
R. E. Riman ◽  
D. M. Haaland ◽  
C.J.M. Northrup ◽  
H. K. Bowen ◽  
A. Bleier
Keyword(s):  
Ir Spectra ◽  
Detailed Analysis ◽  
Infrared Spectra ◽  
Spectral Features ◽  
Absorption Bands ◽  
Infrared Study ◽  
Characteristic Absorption ◽  
Local Environments ◽  
Insight Into ◽  
Hydrolysis Reactions

ABSTRACTA Sr/Ti bimetallic isopropoxide complex was synthesized by two methods. The complex served as a precursor to the production of homogeneous SrTiO3 powders via alkoxide hydrolysis. Infrared spectra were obtained for Sr(OPri)2, Ti(OPri)4, and the product of the syntheses. In addition, the IR spectra of the solutions of each of the alkoxides were followed as hydrolysis reactions proceeded. Detailed analysis of the spectral features support the existence of a 1:1 Sr/Ti bimetallic alkoxide. The new Sr/Ti compound exhibits characteristic absorption bands at (1017, 993, 972, 961 cm−1), (844, 838, 827 cm−1) and (620, 596, and 572 −1). A band at 819−1 might also be associated with the new Sr/Ti bimetallic alkoxide. The infrared spectra suggest that the isopropoxide ligands in the bimetallic alkoxide are in at least three separate local environments. This information offers insight into possible structures for the complex.

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.

scholarly journals Improved Part-Based Segmentation of Voxel Shapes by Skeleton Cut Spaces

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Cong Feng ◽  
Andrei C. Jalba ◽  
Alexandru C. Telea
Keyword(s):  
Detailed Analysis ◽  
Parameter Space ◽  
Symmetry Axis ◽  
Local Symmetry ◽  
Interactive Segmentation ◽  
Medial Surface ◽  
Refined Method ◽  
3D Shapes ◽  
Robust To Noise ◽  
Selection Of

AbstractWe present a refined method for part-based segmentation of voxel shapes by constructing partitioning cuts from every voxel of the shape’s medial surface. Our cuts have several desirable properties – smoothness, tightness, and orientation with respect to the shape’s local symmetry axis, making it a good segmentation tool.We analyze the space of all cuts created for a given shape and detect cuts which are good segment borders. We present a detailed analysis of the parameter space of our method, which yields good preset values for all its parameters. Our method is robust to noise, pose invariant, independent on the shape geometry and genus, and is simple to implement.We demonstrate our method for both automatic and interactive segmentation on a wide selection of 3D shapes.

Non-Markovinity of single qubit channels: analytical and numerical methods

2014 ◽  
Vol 92 (3) ◽  
pp. 230-235
Author(s):  
Jian-Song Zhang ◽  
Ai-Xi Chen
Keyword(s):  
Numerical Methods ◽  
Quantum States ◽  
Amplitude Damping ◽  
Single Qubit ◽  
Phase Damping ◽  
Bit Flip ◽  
Explicit Expressions

We propose methods to calculate non-Markovianity of four typical single qubit channels including flip (bit-flip, phase-flip, and bit-phase flip channels), depolarizing, phase damping, and amplitude damping channels analytically. Explicit expressions of non-Markovianity for some single qubit channels are obtained. For general channels we propose the Euler parametrization representation of quantum states to calculate non-Markovianity numerically.

scholarly journals MINIMAL ENTANGLEMENT FIDELITIES OF SOME SINGLE QUBIT QUANTUM NOISY CHANNELS

2002 ◽  
Vol 16 (01n02) ◽  
pp. 19-25 ◽  
Author(s):  
XIAN-TING LIANG
Keyword(s):  
The Other ◽  
Noisy Channels ◽  
Amplitude Damping ◽  
Single Qubit ◽  
Phase Damping ◽  
Amplitude Damping Channel ◽  
Depolarizing Channel ◽  
Quantum Noisy Channels

The minimal entanglement fidelities of the phase damping channel, depolarizing channel, two-Pauli channel and amplitude damping channel are calculated. It is shown that for the same condition, the minimal fidelity of the phase damping channel is the biggest among the four channels. The minimal fidelity of the depolarizing channel is bigger than the other two.

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