Quantum correlation dynamics of two qubits in noisy environments: The factorization law and beyond

2012 ◽  
Vol 327 (9) ◽  
pp. 2074-2084 ◽  
Author(s):  
Guo-Feng Zhang ◽  
Ai-Ling Ji ◽  
Heng Fan ◽  
Wu-Ming Liu
Keyword(s):  
Quantum Correlation ◽  
Noisy Environments ◽  
Factorization Law

scholarly journals SUDDEN CHANGE OF QUANTUM DISCORD UNDER SINGLE QUBIT NOISE

2013 ◽  
Vol 11 (05) ◽  
pp. 1350048 ◽  
Author(s):  
LI-XING JIA ◽  
BO LI ◽  
R.-H. YUE ◽  
HENG FAN
Keyword(s):  
Quantum System ◽  
Quantum Correlation ◽  
Quantum Discord ◽  
Sudden Change ◽  
Entangled State ◽  
Noisy Environment ◽  
Noisy Environments ◽  
Single Qubit ◽  
Sudden Transition

We show that the sudden change of quantum correlation can occur even when only one part of the composite entangled state is exposed to a noisy environment. Our results are illustrated through the action of different noisy environments individually on a single qubit of quantum system. Composite noise on the whole of the quantum system is thus not the necessarily condition for the occurrence of sudden transition for quantum correlation.

Quantum discord of a three-qubit W-class state in noisy environments

2012 ◽  
Vol 12 (7&8) ◽  
pp. 677-692
Author(s):  
Hui Guo ◽  
Jin-Ming Liu ◽  
Cheng-Jie Zhang ◽  
C. H. Oh
Keyword(s):  
Numerical Analysis ◽  
Sudden Death ◽  
Quantum Correlation ◽  
Quantum Discord ◽  
Sudden Change ◽  
Noisy Environments ◽  
Classical Correlation ◽  
Entanglement Of Formation ◽  
Sudden Transition ◽  
Bit Flip

We study the dynamics of the pairwise quantum discord (QD), classical correlation (CC), and entanglement of formation (EOF) for the three-qubit W-class state |W>_{123}=\frac 12(|100>_{123}+|010>_{123}+\sqrt{2}|001>_{123}) under the influence of various Markovian noises by analytically solving the master equation in the Lindblad form. Through numerical analysis, we find that EOF decreases asymptotically to zero with time for the dephasing noise, but it undergoes sudden death for the bit-flip noise, the isotropic noise, as well as the dissipative and noisy environments. Moreover, QD decays to zero in an asymptotical way for all the noises we investigated. Thus, when the W-class state |W>_{123} is subject to the above Markovian noises, QD is more robust than EOF against decoherence excluding the phase-flip noise, implying that QD is more useful than entanglement to characterize the quantum correlation. We also find a remarkable character for the CC in the presence of the phase-flip noise, i.e., CC displays the behavior of sudden transition and then keeps constant permanently, but the corresponding QD just exhibits a very small sudden change. Furthermore, we verify the monogamic relation between the pairwise QD and EOF of the W-class state.

SMART IDENTIFICATION OF POWER QUALITY EVENTS USING NEW STOCKWELL TRANSFORM AND MACHINE LEARNING ALGORITHM

2019 ◽  
Vol XVI (4) ◽  
pp. 95-113
Author(s):  
Muhammad Tariq ◽  
Tahir Mehmood
Keyword(s):  
Machine Learning ◽  
Power Quality ◽  
Learning Algorithm ◽  
Machine Learning Algorithm ◽  
Noisy Environments ◽  
Satisfactory Performance ◽  
Feature Values ◽  
Learning Machine ◽  
Stockwell Transform ◽  
Electrical Utilities

Accurate detection, classification and mitigation of power quality (PQ) distortive events are of utmost importance for electrical utilities and corporations. An integrated mechanism is proposed in this paper for the identification of PQ distortive events. The proposed features are extracted from the waveforms of the distortive events using modified form of Stockwell’s transform. The categories of the distortive events were determined based on these feature values by applying extreme learning machine as an intelligent classifier. The proposed methodology was tested under the influence of both the noisy and noiseless environments on a database of seven thousand five hundred simulated waveforms of distortive events which classify fifteen types of PQ events such as impulses, interruptions, sags and swells, notches, oscillatory transients, harmonics, and flickering as single stage events with their possible integrations. The results of the analysis indicated satisfactory performance of the proposed method in terms of accuracy in classifying the events in addition to its reduced sensitivity under various noisy environments.

An Asynchronous Anycast Cross-layer Protocol for WSN Suited to Noisy Environments

2021 ◽  
Author(s):  
Tales Heimfarth ◽  
João Carlos Giacomin ◽  
Bruno de Oliveira Schneider
Keyword(s):  
Cross Layer ◽  
Noisy Environments

scholarly journals Locality and entanglement of indistinguishable particles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Till Jonas Frederick Johann ◽  
Ugo Marzolino
Keyword(s):  
Quantum Mechanics ◽  
Quantum Correlation ◽  
Indistinguishable Particle ◽  
Local Operators

AbstractEntanglement is one of the strongest quantum correlation, and is a key ingredient in fundamental aspects of quantum mechanics and a resource for quantum technologies. While entanglement theory is well settled for distinguishable particles, there are five inequivalent approaches to entanglement of indistinguishable particles. We analyse the different definitions of indistinguishable particle entanglement in the light of the locality notion. This notion is specified by two steps: (i) the identification of subsystems by means of their local operators; (ii) the requirement that entanglement represent correlations between the above subsets of operators. We prove that three of the aforementioned five entanglement definitions are incompatible with any locality notion defined as above.

Do primary school libraries affect teenagers’ attitudes towards leisure reading?

IFLA Journal ◽  
2021 ◽  
pp. 034003522098335
Author(s):  
Pamela McKirdy
Keyword(s):  
High School ◽  
Primary School ◽  
Family Background ◽  
School Libraries ◽  
First Year ◽  
Noisy Environments ◽  
Primary School Students ◽  
School Students ◽  
Leisure Reading ◽  
Reading For Pleasure

This study explores how New Zealand primary school students’ experiences of school libraries affected their attitudes towards reading for pleasure once they entered secondary school. Two hundred and seventy-six students in their first year at high school completed a survey asking about their primary school libraries. The students were asked to self-identify as keen readers, occasional readers or non-readers. The results were analysed in a spreadsheet, considering variables such as attitude to reading, former school and family background. The students were mainly positive about their libraries, but were bothered by cramped and noisy environments and books they perceived as babyish. Students from schools with a librarian were more positive about reading for fun than those from schools where the library was not prioritised. Students from a family background where reading was encouraged were more likely to maintain a positive attitude to reading by the time they reached high school.

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