Nonlocality dynamics for an eight-qubit model in cavity QEDs

2017 ◽  
Vol 15 (05) ◽  
pp. 1750035
Author(s):  
Ihab H. Naeim ◽  
J. Batle ◽  
S. Abdalla ◽  
A. Farouk
Keyword(s):  
Cavity Qed ◽  
Degrees Of Freedom ◽  
Bell Inequality ◽  
Complex Behavior ◽  
Correlation Measure ◽  
Present Contribution ◽  
Maximal Violation ◽  
The Way

We study the nonlocality dynamics for an eight-qubit model in cavity QED, where four atoms are confined in four different cavities, all of them initially prepared in the maximally correlated state of four qubits, which corresponds to the atomic degrees of freedom. The nonlocality evolution for the latter states will show that the corresponding maximal violation of a multipartite Bell inequality will experience revivals at precise times, defining, in analogy with entanglement, nonlocality sudden deaths, as well as nonlocality sudden rebirths. The present contribution paves the way to describe, by employing the nonlocality multipartite correlation measure, collective complex behavior displayed by slightly interacting cavity QED arrays.

scholarly journals Researcher Degrees of Freedom in the Psychology of Religion

2018 ◽  
Author(s):  
Sarah Jane Charles ◽  
James Edward Bartlett ◽  
Kyle J. Messick ◽  
Thomas Joseph Coleman ◽  
Alex Uzdavines
Keyword(s):  
Systematic Review ◽  
Degrees Of Freedom ◽  
Psychology Of Religion ◽  
Open Science ◽  
Science Practices ◽  
Replication Crisis ◽  
The Way

There is a push in psychology toward more transparent practices, stemming partially as a response to the replication crisis. We argue that the psychology of religion should help lead the way toward these new, more transparent practices to ensure a robust and dynamic subfield. One of the major issues that proponents of Open Science practices hope to address is researcher degrees of freedom (RDF). We pre-registered and conducted a systematic review of the 2017 issues from three psychology of religion journals. We aimed to identify the extent to which the psychology of religion has embraced Open Science practices and the role of RDF within the subfield. We found that many of the methodologies that help to increase transparency, such as pre-registration, have yet to be adopted by those in the subfield. In light of these findings, we present recommendations for addressing the issue of transparency in the psychology of religion and outline how to move toward these new Open Science practices.

scholarly journals Entanglement-enhanced matter-wave interferometry in a high-finesse cavity

2021 ◽  
Author(s):  
James Thompson ◽  
Graham Greve ◽  
Chengyi Luo ◽  
Baochen Wu
Keyword(s):  
Cavity Qed ◽  
Degrees Of Freedom ◽  
Inertial Sensors ◽  
Mean Field ◽  
New Physics ◽  
Matter Wave ◽  
Quantum Limit ◽  
Entangled State ◽  
Standard Quantum ◽  
Standard Quantum Limit

Abstract Entanglement is a fundamental resource that allows quantum sensors to surpass the standard quantum limit set by the quantum collapse of independent atoms. Collective cavity-QED systems have succeeded in generating large amounts of directly observed entanglement involving the internal degrees of freedom of laser-cooled atomic ensembles. Here we demonstrate cavity-QED entanglement of external degrees of freedom to realize a matter-wave interferometer of 700 atoms in which each individual atom falls freely under gravity and simultaneously traverses two paths through space while also entangled with the other atoms. We demonstrate both quantum non-demolition measurements and cavity-mediated spin interactions for generating squeezed momentum states with directly observed metrological gain 3.4^{+1.1}_{-0.9} dB and 2.5^{+0.6}_{-0.6} dB below the standard quantum limit respectively. An entangled state is for the first time successfully injected into a Mach-Zehnder light-pulse interferometer with 1.7^{+0.5}_{-0.5} dB of directly observed metrological enhancement. These results open a new path for combining particle delocalization and entanglement for inertial sensors, searches for new physics, particles, and fields, future advanced gravitational wave detectors, and accessing beyond mean-field quantum many-body physics.

scholarly journals On How QCD Gauge Invariance Gets Realized in the Context of Effective Locality

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
H. M. Fried ◽  
T. Grandou ◽  
R. Hofmann
Keyword(s):  
Gauge Invariance ◽  
Degrees Of Freedom ◽  
Green's Functions ◽  
Green’S Functions ◽  
The Way

The fermionic Green’s functions of QCD exhibit an unexpected property of effective locality, which appears to be exact, involving no approximation. This property is nonperturbative, resulting from a full integration of the elementary gluonic degrees of freedom of QCD. Recalling, correcting, and extending the derivations of effective locality, focus is put on the way nonabelian gauge invariance gets realized in the fermionic nonperturbative regime of QCD.

scholarly journals Some Lessons from the Schwinger Model

1997 ◽  
Vol 12 (06) ◽  
pp. 1091-1099 ◽  
Author(s):  
Gary McCartor
Keyword(s):  
Boundary Conditions ◽  
Degrees Of Freedom ◽  
Chiral Condensate ◽  
Number Of Solutions ◽  
Different Boundary Conditions ◽  
Schwinger Model ◽  
The Way

I shall recall a number of solutions to the Schwinger model in different gauges, having different boundary conditions and using different quantization surfaces. I shall discuss various properties of these solutions emphasizing the degrees of freedom necessary to represent the solution, the way the operator products are defined and the effects these features have on the chiral condensate.

2. Does form follow function?

2014 ◽  
Author(s):  
David Blockley
Keyword(s):  
Potential Energy ◽  
Degrees Of Freedom ◽  
Minimum Potential Energy ◽  
Form Finding ◽  
Internal Forces ◽  
Minimum Potential ◽  
The Way

In c.15 bc, the Roman Vitruvius stated that a good building should satisfy three requirements: durability, utility, and beauty. ‘Does form follow function?’ examines utility and beauty. It explains that structures are naturally lazy because they contain minimum potential energy. Each piece of structure, however small or large, will move, but not freely as the neighbouring pieces will get in the way. When this happens internal forces are created as the pieces bump up against each other. Force pathways are degrees of freedom and the structure has to be strong enough to resist these internal forces along these pathways. Form-finding structures are exciting and innovative examples of the fusion of engineering and architecture.

scholarly journals Rapid estimation of notch stress intensity factors in 3D large-scale welded structures using the peak stress method

2018 ◽  
Vol 165 ◽  
pp. 17004 ◽  
Author(s):  
Alberto Campagnolo ◽  
Giovanni Meneghetti
Keyword(s):  
Stress Intensity ◽  
High Performance ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Peak Stress ◽  
Industrial Applications ◽  
Mode I ◽  
Present Contribution ◽  
Notch Stress ◽  
Welded Structure

The Peak Stress Method (PSM) is an engineering, FE-oriented application of the notch stress intensity factor (NSIF) approach to fatigue design of welded joints, which takes advantage of the singular linear elastic peak stresses from FE analyses with coarse meshes. Originally, the PSM was calibrated to rapidly estimate the NSIFs by using 3D, eight-node brick elements, taking advantage of the submodeling technique. 3D modelling of large-scale structures is increasingly adopted in industrial applications, thanks to the growing spread of high-performance computing (HPC). Based on this trend, the application of PSM by means of 3D models should possibly be even more speeded up. To do this, in the present contribution the PSM has been calibrated under mode I, II and III loadings by using ten-node tetra elements, which are able to directly discretize complex 3D geometries without the need for submodels. The calibration of the PSM has been carried out by analysing several 3D mode I, II and III problems. Afterwards, an applicative example has been considered, which is relevant to a large-scale steel welded structure, having overall size on the order of meters. Two 3D FE models, having global size of tetra elements equal to 5 and 1.66 mm, have been solved by taking advantage of HPC, being the global number of degrees of freedom equal to 10 and 140 millions, respectively. The NSIFs values estimated at the toe and root sides according to the PSM have been compared with those calculated by adopting a shell-to-solid technique.

scholarly journals Geometric Non-Linear Approach to Stiffness State of Semi–Rigid Structures

2016 ◽  
Vol 6 (1) ◽  
pp. 63-70
Author(s):  
Moldovan Corina
Keyword(s):  
Degrees Of Freedom ◽  
Virtual Work ◽  
Steel Structures ◽  
Structural Level ◽  
Element Level ◽  
Present Contribution ◽  
Six Degrees Of Freedom ◽  
Non Linear ◽  
Linear Elements ◽  
Global Systems

Abstract Present contribution intends to emphasize the contribution of geometric non-linearity to the stiffness state of semi-rigid multi–storey steel structures. Though semi-rigidity of beam – column connections involves a nonlinearity at constitutive bending momentrelative rotation level, the geometric nonlinearity associated to deformed conFigure uration at element level is less referred to. The main objective of the study is to express the stiffness state of geometric non-linear elements semi-rigidly connected at its ends. Stiffness state is, in its term, expressed by element level stiffness matrix considering the six degrees of freedom of the planar element. Regarding the reference system, both local and global systems are employed allowing a simple and direct transition from element level vectorial relations to their structural level forms. The three fundamental vectorial relations (static equilibrium, kinematic compatibility, material constitutivity) emphasize that the principle of virtual work holds in the case of semi-rigidly connected skeletal structures as well.

Iterative Adaptive Control of a Three Degrees-of-Freedom Aeroelastic Wing Model

2013 ◽  
Vol 300-301 ◽  
pp. 1593-1599 ◽  
Author(s):  
József Kázmér Tar ◽  
Imre J. Rudas ◽  
János F. Bitó ◽  
Krisztián Kósi
Keyword(s):  
Degrees Of Freedom ◽  
Present Contribution ◽  
Precise Control ◽  
Wing Model ◽  
Adaptive Technique ◽  
Point Transformations ◽  
Edge Surface ◽  
Surface Deflection ◽  
P Type ◽  
Three Degrees Of Freedom

The aeroelastic wing model is an underactuated 3 Degrees-of-Freedom (DoF) system in which only a single control signal can be applied. Its model-based control attracted much attention recently. In the present contribution the effects of 20% modeling error in two significant system parameters are investigated in PI and P-type controllers that can be made adaptive by the application of Robust Fixed Point Transformations (RFPT). It is shown that by the use of this simple adaptive technique operating with altogether 4 control parameters precise control of the trailing-edge surface deflection is possible. This statement is substantiated by simulation results.

Dynamics of bell-nonlocality for two atoms interacting with a vacuum multi-mode noise field

2016 ◽  
Vol 14 (03) ◽  
pp. 1650011 ◽  
Author(s):  
Yu-Jie Liu ◽  
Li Zheng ◽  
Dong-Mei Han ◽  
Huan-Lin Lü ◽  
Tai-Yu Zheng
Keyword(s):  
Degrees Of Freedom ◽  
Internal State ◽  
Bell Inequality ◽  
Entanglement Dynamics ◽  
Noise Field ◽  
Chsh Inequality ◽  
Internal States ◽  
Bell Nonlocality ◽  
Multi Mode ◽  
Spatial Degrees Of Freedom

We investigate the internal-state Bell nonlocal entanglement dynamics, as measured by CHSH inequality of two atoms interacting with a vacuum multi-mode noise field by taking into account the spatial degrees of freedom of the two atoms. The dynamics of Bell nonlocality of the atoms with the atomic internal states being initially in a Werner-type state is studied, by deriving the analytical solutions of the Schrödinger equation, and tracing over the degrees of freedom of the field and the external motion of the two atoms. In addition, through comparison with entanglement as measured by concurrence, we find that the survival time of entanglement is much longer than that of the Bell-inequality violation. And the comparison of the quantum correlation time between two Werner-type states is discussed.

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