scholarly journals Decoherence and pointer states in small antiferromagnets: A benchmark test

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Hylke Donker ◽  
Hans De Raedt ◽  
Mikhail Katsnelson
Keyword(s):  
Quantum Measurement ◽  
The Self ◽  
Environment Interaction ◽  
Benchmark Test ◽  
System Environment ◽  
Preferred Basis ◽  
Measurement Limit ◽  
Pointer States ◽  
Decoherence Process

We study the decoherence process of a four spin-1/2 antiferromagnet that is coupled to an environment of spin-1/2 particles. The preferred basis of the antiferromagnet is discussed in two limiting cases and we identify two exact pointer states. Decoherence near the two limits is examined whereby entropy is used to quantify the robustness of states against environmental coupling. We find that close to the quantum measurement limit, the self-Hamiltonian of the system of interest can become dynamically relevant on macroscopic timescales. We illustrate this point by explicitly constructing a state that is more robust than (generic) states diagonal in the system-environment interaction Hamiltonian.

scholarly journals Photonic simulation of system-environment interaction: Non-Markovian processes and dynamical decoupling

2013 ◽  
Vol 88 (6) ◽  
Author(s):  
Chang-Ling Zou ◽  
Xiang-Dong Chen ◽  
Xiao Xiong ◽  
Fang-Wen Sun ◽  
Xu-Bo Zou ◽  
...  
Keyword(s):  
Environment Interaction ◽  
Dynamical Decoupling ◽  
System Environment ◽  
Markovian Processes

scholarly journals Efficient simulation of non-Markovian system-environment interaction

2016 ◽  
Vol 18 (2) ◽  
pp. 023035 ◽  
Author(s):  
Robert Rosenbach ◽  
Javier Cerrillo ◽  
Susana F Huelga ◽  
Jianshu Cao ◽  
Martin B Plenio
Keyword(s):  
Environment Interaction ◽  
System Environment ◽  
Efficient Simulation ◽  
Markovian System

Sex and the Aesthetics of Existence

PMLA ◽  
2010 ◽  
Vol 125 (2) ◽  
pp. 387-392 ◽  
Author(s):  
Tim Dean
Keyword(s):  
Queer Theory ◽  
Human Subject ◽  
The Self ◽  
Preferred Basis ◽  
Principal Reason ◽  
The World

Leo Bersani's contributions to Queer Theory have been essentially traumatic. Ever since “Is the Rectum a Grave?,” with its startling opening sentence (“There is a big secret about sex: most people don't like it” [197]), Bersani's writing on sexuality has disrupted the conceptual coordinates of queer theory, a field that officially welcomes the disruptive. What has made Bersani hard to assimilate is less his psychoanalytic emphasis on the ineluctable masochism of sexuality (a principal reason for the aversion to sex) than his insistent conceptualization of sexuality in aesthetic terms. Although his work has never shied from the rebarbative aspects of erotic life, it is, in fact, Bersani's speculations about relationality as irreducibly aesthetic that have proved tougher for the field of queer theory to countenance. (Queer theorists take sexual variance in stride; we have a harder time dealing with art.) It is not merely that Bersani draws examples from literature, painting, sculpture, and cinema when discussing erotic relationality. More fundamentally, his earlier work claimed that art has effects on the human subject akin to those of sexuality, while his later writing proposes a specifically aesthetic subjectivity—rather than the sexual kind—as the preferred basis for relating to the world beyond the self.

Effects of static noise on the dynamics of quantum correlations for a system of three qubits

2017 ◽  
Vol 31 (08) ◽  
pp. 1750046 ◽  
Author(s):  
Tenemeza Kenfack Lionel ◽  
Tchoffo Martin ◽  
Fouokeng Georges Collince ◽  
Lukong Cornelius Fai
Keyword(s):  
Open Quantum Systems ◽  
Quantum Correlations ◽  
Entangled State ◽  
Environment Interaction ◽  
Initial State ◽  
Text Type ◽  
System Environment ◽  
Entanglement Witnesses ◽  
Long Time ◽  
Static Noise

Correlations in open quantum systems exhibit peculiar phenomena under the effect of various sources of noise. Here, we investigate the dynamics of entanglement and quantum discord (QD) for three noninteracting qubits coupled with a classical environmental static noise characterized by an external random field. Two initial entangled states of the system are examined, namely, the GHZ- and [Formula: see text]-type states. The system-environment interaction is here analyzed in three different configurations, namely, independent, mixed and common environments. We find that the dynamics of quantum correlations are strongly affected by the type of system-environment interaction and the purity of the initial entangled state. Indeed, depending on the type of interaction and the value of the purity of the initial state, peculiar phenomena such as sudden death, revivals and long-time survival of quantum correlations are observed. On the other hand, our results clearly show that quantum correlations initially present in the [Formula: see text]-type states are less robust than those of the GHZ-type states. Furthermore, we find that the long-time survival of entanglement can be detected by means of the suitable entanglement witnesses.

Further Test of the Relationship between Satisfaction and Perceived Self-Environment Similarity

1968 ◽  
Vol 26 (3) ◽  
pp. 835-838 ◽  
Author(s):  
Lawrence A. Pervin ◽  
Stephen H. Smith
Keyword(s):  
Semantic Differential ◽  
The Self ◽  
Environment Interaction ◽  
Transactional Analysis ◽  
Ideal Self ◽  
Different Types ◽  
The Relationship ◽  
Interaction Research

A test of the hypothesis that satisfaction with one's environment is related to perceived self-environment similarity and to the utility of TAPE (Transactional Analysis of Personality and Environment), based on the semantic differential. 169 Ss rated the concepts Self, Ideal Self and My Club on 52 polar adjective scales. Perceived self-club environment similarity was found to be related to ratings of satisfaction with a club environment on two different forms of TAPE. The relationship between similarity and satisfaction varied for different types of club satisfaction and did not appear to reflect satisfaction with the self. It was suggested that the semantic differential is a useful tool for individual-environment interaction research but further research with it would be more effective if relationships, in terms of distance and direction, of ratings for concepts such as Self, Ideal Self and Environment, were available.

Genotypic and environmental effects on curd weight of autumn-maturing cauliflowers

1978 ◽  
Vol 90 (1) ◽  
pp. 11-17 ◽  
Author(s):  
P. Crisp ◽  
V. Kesavan
Keyword(s):  
Environmental Effects ◽  
High Stability ◽  
High Weight ◽  
The Self ◽  
Genotypic Differences ◽  
Environment Interaction ◽  
Genotype Environment Interaction ◽  
Single Variety

SUMMARYTwelve genotypes of cauliflower were grown in two seasons from six seedling propagation treatments in three sequential sowings. There was a high genotypic component of variation for curd weight, indicating that this character can be improved by breeding. A large genotype × environment interaction included genotypic differences in stability to the environment, notably in the self-compatible genotypes. Mean curd weight and stability of genotypes to the environment for this trait were uncorrelated, indicating that high weight and high stability could be bred into a single variety.

scholarly journals School Development as Communication Processes

2012 ◽  
Vol 10 (4) ◽  
pp. 461-474
Author(s):  
Lene Nyhus ◽  
Lars Monsen
Keyword(s):  
Professional Learning Communities ◽  
Learning Communities ◽  
Professional Learning ◽  
School Development ◽  
Environment Interaction ◽  
System Environment ◽  
Assessment Culture ◽  
Critical Realist ◽  
Communication Processes ◽  
Development Processes

This article offers a contribution to a better ontological clarity in the field of school development, including development of an evaluation culture. Research reveals that it is difficult for schools to live up to the ideas and ideals for school development such as the development of an evaluation and assessment culture, establishing learning organisations and furthering professional learning communities. Studies in the field now emphasise the need to understand the complexity of school systems, recognising system-environment interaction and that one ‘shoe’ does not fit all sizes. This knowledge calls attention to a need for reflection on the ontology of school development processes, and to frameworks which are capable of dealing with the complexity. As such, this article offers new conceptual explorations into school development. Drawing on critical realist metatheory and on meta-perspectives from different disciplines, the article suggests that communication and interaction constitute the processes of evaluation and learning in schools. It also suggests that attention has to be paid to the mechanisms and structures supporting the emergence of an evaluation and learning culture.

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