MDPI - Publisher of Open Access Journals

15 pages, 820 KiB

Open AccessArticle

Quantum Correlation Swapping between Two Werner States Undergoing Local and Nonlocal Unitary Operations

by Chuanmei Xie, Zhanjun Zhang, Jianlan Chen and Xiaofeng Yin

Entropy 2022, 24(9), 1244; https://doi.org/10.3390/e24091244 - 4 Sep 2022

Cited by 1 | Viewed by 1273

In this paper, quantum correlation (QC) swapping between two Werner-like states, which are transformed from Werner states undergoing local and nonlocal unitary operations, are studied. Bell states measures are performed in the middle node to realize the QC swapping and correspondingly final correlated sates are obtained. Two different QC quantifiers, i.e., measurement-induced disturbance (MID) and ameliorated MID, are employed to characterize and quantify all the concerned QCs in the swapping process. All QCs in the concerned states are evaluated analytically and numerically. Correspondingly, their characteristics and properties are exposed in detail. It is exposed that, through the QC swapping process, one can obtain the long-distance QC indeed. Moreover, the similarities of monotony features of MID and AMID between the initial states and final states are exposed and analyzed. Full article

(This article belongs to the Special Issue Quantum Information and Computation)

► Show Figures

Figure 1

16 pages, 812 KiB

Open AccessArticle

Quantum Reactivity: An Indicator of Quantum Correlation

by Shahabeddin M. Aslmarand, Warner A. Miller, Verinder S. Rana and Paul M. Alsing

Entropy 2020, 22(1), 6; https://doi.org/10.3390/e22010006 - 19 Dec 2019

Cited by 3 | Viewed by 3349

Abstract

Geometry is often a valuable guide to complex problems in physics. In this paper, we introduce a novel geometric quantity called quantum reactivity (QR) to probe quantum correlations in higher-dimensional quantum systems. Much like quantum discord, QR is not a measure of quantum entanglement but can be useful in quantum information processes where a notion of quantum correlation in higher dimensions is needed. Both quantum discord and QR are extendable to an arbitrarily large number of qubits; however, unlike discord, QR satisfies the invariance under unitary operations. Our approach parallels Schumacher’s singlet state triangle inequality, which used an information geometry-based entropic distance. We use a generalization of information distance to area, volume, and higher-dimensional volumes and then use these to define a quantity that we call QR, which is the familiar ratio of surface area to volume. We examine a spectrum of multipartite states (Werner, W, GHZ, randomly generated density matrices, etc.) and demonstrate that QR can provide an ordering of these quantum states as to their degree of quantum correlation. Full article

(This article belongs to the Collection Quantum Information)

► Show Figures

Figure 1

31 pages, 667 KiB

Open AccessReview

Use of p38 MAPK Inhibitors for the Treatment of Werner Syndrome

by Mark C. Bagley, Terence Davis, Paola G. S. Murziani, Caroline S. Widdowson and David Kipling

Pharmaceuticals 2010, 3(6), 1842-1872; https://doi.org/10.3390/ph3061842 - 4 Jun 2010

Cited by 35 | Viewed by 17528

Abstract

Werner syndrome provides a convincing model for aspects of the normal ageing phenotype and may provide a suitable model for therapeutic interventions designed to combat the ageing process. Cultured primary fibroblast cells from Werner syndrome patients provide a powerful model system to study the link between replicative senescence in vitro and in vivo pathophysiology. Genome instability, together with an increased pro-oxidant state, and frequent replication fork stalling, all provide plausible triggers for intracellular stress in Werner syndrome cells, and implicates p38 MAPK signaling in their shortened replicative lifespan. A number of different p38 MAPK inhibitor chemotypes have been prepared rapidly and efficiently using microwave heating techniques for biological study in Werner syndrome cells, including SB203580, VX-745, RO3201195, UR-13756 and BIRB 796, and their selectivity and potency evaluated in this cellular context. Werner syndrome fibroblasts treated with a p38 MAPK inhibitor reveal an unexpected reversal of the accelerated ageing phenotype. Thus the study of p38 inhibition and its effect upon Werner pathophysiology is likely to provide new revelations into the biological mechanisms operating in cellular senescence and human ageing in the future. Full article

(This article belongs to the Special Issue Protein Kinase Inhibitors)

► Show Figures

Figure 1

Search Results (3)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI

Saved Queries

Search Filter Reset All

Years

Feature Papers

Subjects

Journals

Article Types

Countries / Regions

Search Results (3)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI