scholarly journals Experimental Investigation of the Robustness of a New Bell-Type Inequality of Triphoton GHZ States in Open Systems

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1514
Author(s):  
Jiaqiang Zhao ◽  
Meijiao Wang ◽  
Lianzhen Cao ◽  
Yang Yang ◽  
Xia Liu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Noise Intensity ◽  
Open Systems ◽  
Type Inequality ◽  
Particle Systems ◽  
Mixed States ◽  
Quantum Bit ◽  
Ghz States ◽  
Information Fidelity ◽  
Different Levels

Knowing the level of entanglement robustness against quantum bit loss or decoherence mechanisms is an important issue for any application of quantum information. Fidelity of states can be used to judge whether there is entanglement in multi-particle systems. It is well known that quantum channel security in QKD can be estimated by measuring the robustness of Bell-type inequality against noise. We experimentally investigate a new Bell-type inequality (NBTI) in the three-photon Greenberger–Horne–Zeilinger (GHZ) states with different levels of spin-flip noise. The results show that the fidelity and the degree of violation of the NBTI decrease monotonically with the increase of noise intensity. They also provide a method to judge whether there is entanglement in three-particle mixed states.

Experimental investigation of decoherence in maximally entangled mixed states

2005 ◽  
Vol 105 (6) ◽  
pp. 750-757 ◽  
Author(s):  
Minaru Kawamura ◽  
Takuji Morimoto ◽  
Takashi Kumaya ◽  
Ryuichi Sawae ◽  
Kenichi Takarabe ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Mixed States

Geometric phase of mixed states for three-level open systems

2010 ◽  
Vol 82 (6) ◽  
Author(s):  
Yanyan Jiang ◽  
Y. H. Ji ◽  
Hualan Xu ◽  
Li-yun Hu ◽  
Z. S. Wang ◽  
...  
Keyword(s):  
Geometric Phase ◽  
Open Systems ◽  
Mixed States

Low Solar Absorption Coating for Reducing Rail Temperature

2014 ◽  
Author(s):  
Hao Wang ◽  
Jiaqi Chen ◽  
P. N. Balaguru ◽  
Leith Al-Nazer
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Field Measurements ◽  
Temperature Fields ◽  
Track Structure ◽  
Coating Materials ◽  
Solar Absorption ◽  
Average Temperature ◽  
Train Speed ◽  
Different Levels

The feasibility of using low-solar-absorption coatings to reduce the temperature rise of rails in summer is investigated in this paper using numerical analysis. Finite element (FE) models were developed based on the theory of heat transfer for predicting temperature fields in the rail track structure. Field measurements of air temperature and rail temperature were used to verify the modeled temperatures. Analysis results show that the developed FE models provide reasonable predictions of rail temperature. The 3-D rail temperature field shows that rail temperature differs spatially in the natural environment, which indicates that the current average temperature models may not provide accurate prediction of peak rail temperature. The peak temperature was observed at the top of rail seated on the wood ties. The developed FE models were further used to analyze the influence of solar absorptivity and emissivity of coating materials on rail temperature. Decreasing the absorptivity and increasing the emissivity of rail surface may decrease the peak rail temperature at different levels. The effect of decreased absorptivity was found to be more significant. This indicates that when an engineered coating material is applied on rail side surfaces, the peak rail temperature can be decreased significantly, which provides an alternative solution to reduce rail buckling risk without decreasing train speed or increasing the laydown temperature of rail. The experimental investigation of the effect of low solar absorption coating on rail temperature is ongoing.

scholarly journals Teleportation via maximally and non-maximally entangled mixed states

2010 ◽  
Vol 10 (5&6) ◽  
pp. 398-419
Author(s):  
S. Adhikari ◽  
A.S. Majumdar ◽  
S. Roy ◽  
B. Ghosh ◽  
N. Nayak
Keyword(s):  
Mixed State ◽  
Quantum Teleportation ◽  
Convex Combination ◽  
Type Inequality ◽  
Entangled States ◽  
Mixed States ◽  
Werner State ◽  
Parameter Values

We study the efficiency of two-qubit mixed entangled states as resources for quantum teleportation. We first consider two maximally entangled mixed states, viz., the Werner state\cite{werner}, and a class of states introduced by Munro {\it et al.} \cite{munro}. We show that the Werner state when used as teleportation channel, gives rise to better average teleportation fidelity compared to the latter class of states for any finite value of mixedness. We then introduce a non-maximally entangled mixed state obtained as a convex combination of a two-qubit entangled mixed state and a two-qubit separable mixed state. It is shown that such a teleportation channel can outperform another non-maximally entangled channel, viz., the Werner derivative for a certain range of mixedness. Further, there exists a range of parameter values where the former state satisfies a Bell-CHSH type inequality and still performs better as a teleportation channel compared to the Werner derivative even though the latter violates the inequality.

An Experimental Investigation on Aerospace Quality Gears Operating in Loss of Lubrication Condition

2012 ◽  
Author(s):  
Ida Bartilotta ◽  
Enrico Ciulli ◽  
Salvatore Manconi ◽  
Elena Toson
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Contact Pressure ◽  
Bulk Temperature ◽  
Spur Gears ◽  
Sliding Speed ◽  
Aerospace Applications ◽  
Lubrication Condition ◽  
Off Time ◽  
Different Levels

This paper shows the results of an experimental study carried out on spur gears for aerospace applications operating in loss of lubrication. The aim of this work was to establish a baseline for gear behavior under oil off conditions. A total amount of 40 tests were performed with gears made from 2 materials operating at different levels of sliding speed and contact pressure. In some cases the bulk temperature was measured to evaluate the heating of the running gear. A more relevant wear and heating of the gears was observed with the increase of the contact pressure rather than with the increase of the sliding speed. In all the tests the transmission was able to transfer the required power. However some tests were stopped before the required time because of the overcoming of the rig safety threshold. The results showed a different oil off time depending on the material.

scholarly journals Spectral Analysis of Pressure, Noise and Vibration Velocity Measurement in Cavitation

2017 ◽  
Vol 17 (6) ◽  
pp. 250-256 ◽  
Author(s):  
Jana Jablonská ◽  
Miroslav Mahdal ◽  
Milada Kozubková
Keyword(s):  
Experimental Investigation ◽  
Cross Section ◽  
Noise Intensity ◽  
Structural Changes ◽  
Rectangular Cross Section ◽  
Vibration Velocity ◽  
Nozzle Wall ◽  
Air Flow Rate ◽  
Laboratory Equipment

Abstract The article deals with experimental investigation of water cavitation in the convergent-divergent nozzle of rectangular cross-section. In practice, a quick and simple determination of cavitation is essential, especially if it is basic cavitation or cavitation generated additionally by the air being sucked. Air influences the formation, development and size of the cavity area in hydraulic elements. Removal or reduction of the cavity area is possible by structural changes of the element. In case of the cavitation with the suction air, it is necessary to find the source of the air and seal it. The pressure gradient, the flow, the oxygen content in the tank, and hence the air dissolved in the water, the air flow rate, the noise intensity and the vibration velocity on the nozzle wall were measured on laboratory equipment. From the selected measurements the frequency spectrum of the variation of the water flow of the cavity with cavitation without air saturation and with air saturation was compared and evaluated.

scholarly journals Topological Order, Mixed States and Open Systems

2019 ◽  
Vol 26 (03) ◽  
pp. 1950012 ◽  
Author(s):  
Manuel Asorey ◽  
Paolo Facchi ◽  
Giuseppe Marmo
Keyword(s):  
Open Systems ◽  
Quantum Systems ◽  
Topological Phases ◽  
Topological Order ◽  
Mixed States ◽  
Quantum Matter ◽  
Physical Role ◽  
Topological Quantum ◽  
Pure States

The role of mixed states in topological quantum matter is less known than that of pure quantum states. Generalisations of topological phases appearing in pure states have received attention in the literature only quite recently. In particular, it is still unclear whether the generalisation of the Aharonov–Anandan phase for mixed states due to Uhlmann plays any physical role in the behaviour of the quantum systems. We analyse, from a general viewpoint, topological phases of mixed states and the robustness of their invariance. In particular, we analyse the role of these phases in the behaviour of systems with periodic symmetry and their evolution under the influence of an environment preserving its crystalline symmetries.

The Effects of Experience on Complex Problem Representation and Judgment In Auditing: An Experimental Investigation

2006 ◽  
Vol 18 (1) ◽  
pp. 65-83 ◽  
Author(s):  
Constance M. Lehmann ◽  
Carolyn Strand Norman
Keyword(s):  
Professional Development ◽  
Experimental Investigation ◽  
Complex Problem ◽  
Problem Representation ◽  
Complex Problem Solving ◽  
Teaching Approaches ◽  
Going Concern ◽  
Financial Condition ◽  
Different Levels ◽  
Insight Into

The purpose of this study is to investigate problem representation and judgment by auditing professionals within the context of a going-concern task. Our results suggest more experienced auditors have more concise problem representations than do novices. In addition, our results show that some types of concepts listed in the problem representation are associated with judgment, regardless of experience level. This study makes several contributions. First, understanding differences in problem representation at different levels of experience (novice, intermediate, and experienced) gives insight into the process of how representations change as experience changes/develops. Understanding the development of “becoming qualified” to make judgments regarding the going-concern evaluation assists in (1) the development of teaching approaches for analyzing a company's financial condition, and (2) professional development for less-experienced professionals. Further, our measure of problem representation, similar to that in Christ's (1993) study, provides a task-sensitive measure of problem representation for accounting research. This should have important implications for understanding expertise development in complex problem-solving tasks that auditors and accountants face.

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