72 research outputs found
Local Quantum Uncertainty in Two-Qubit Separable States: A Case Study
Recent findings suggest, separable states, which are otherwise of no use in
entanglement dependent tasks, can also be used in information processing tasks
that depend upon the discord type general non classical correlations. In this
work, we explore the nature of uncertainty in separable states as measured by
local quantum uncertainty. Particularly in two-qubit system, we find separable
X-state which has maximum local quantum uncertainty. Interestingly, this
separable state coincides with the separable state, having maximum geometric
discord. We also search for the maximum amount of local quantum uncertainty in
separable Bell diagonal states. We indicate an interesting connection to the
tightness of entropic uncertainty with the state of maximum uncertainty.Comment: 11 pages, 2 figures, latex2e, comments welcome, to appear in qi
On Strong Monogamy Conjecture in Four-Qubit System
Monogamy is a defining feature of entanglement, having far reaching
applications. Recently, Regula \textit{et.al.} in Phys. Rev. Lett.
\textbf{113}, 110501(2014) have proposed a stronger version of monogamy
relation for concurrence. We have extended the strong monogamy inequality for
another entanglement measure, viz., negativity. In particular, we have
concentrated on four-qubit system and provided a detail study on the status of
strong monogamy on pure states. Further, we have analytically provided some
classes of states for which negativity and squared negativity satisfy strong
monogamy. Numerical evidences have also been shown in proper places. Our
analysis also provides cases where strong monogamy is violated.Comment: 8 pages, 8 figures, revtex, comments welcom
Prediction of the aerodynamic behavior of a rounded corner square cylinder at zero incidence using ANN
AbstractThe aerodynamic behavior of a square cylinder with rounded corner edges in steady flow regime in the range of Reynolds number (Re) 5–45; is predicted by Artificial Neural Network (ANN) using MATLAB. The ANN has trained by back propagation algorithm. The ANN requires input and output data to train the network, which is obtained from the commercial Computational Fluid Dynamics (CFD) software FLUENT in the present study. In FLUENT, all the governing equations are discretized by the finite volume method. Results from numerical simulation and back propagation based ANN have been compared. It has been discovered that the ANN predicts the aerodynamic behavior correctly within the given range of the training data. It is additionally observed that back propagation based ANN is an effective tool to forecast the aerodynamic behavior than simulation, that has very much longer computational time
Decoherence Dynamics of Measurement-Induced Nonlocality and comparison with Geometric Discord for two qubit systems
We check the decoherence dynamics of Measurement-induced Nonlocality(in
short, MIN) and compare it with geometric discord for two qubit systems. There
are quantum states, on which the action of dephasing channel cannot destroy MIN
in finite or infinite time. We check the additive dynamics of MIN on a qubit
state under two independent noise. Geometric discord also follows such additive
dynamics like quantum discord. We have further compared non-Markovian evolution
of MIN and geometric discord under dephasing and amplitude damping noise for
pure state and it shows distinct differences between their dynamics.Comment: 11 pages, 10 figures, Revte
Complex 3-Dimensional Microscale Structures for Quantum Sensing Applications
We present a novel method for fabricating highly customizable
three-dimensional structures hosting quantum sensors based on Nitrogen Vacancy
(NV) centers using two-photon polymerization. This approach overcomes
challenges associated with structuring traditional single-crystal quantum
sensing platforms and enables the creation of complex, fully three-dimensional,
sensor assemblies with sub-microscale resolutions (down to 400 nm) and large
fields of view (>1 mm). By embedding NV center-containing nanoparticles in
exemplary structures, we demonstrate high sensitivity optical sensing of
temperature and magnetic fields at the microscale. Our work showcases the
potential for integrating quantum sensors with advanced manufacturing
techniques, facilitating the incorporation of sensors into existing
microfluidic and electronic platforms, and opening new avenues for widespread
utilization of quantum sensors in various applications
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