5 research outputs found
Operational quasiprobabilities for qudits
We propose an operational quasiprobability function for qudits, enabling a
comparison between quantum and hidden-variable theories. We show that the
quasiprobability function becomes positive semidefinite if consecutive
measurement results are described by a hidden-variable model with locality and
noninvasive measurability assumed. Otherwise, it is negative valued. The
negativity depends on the observables to be measured as well as a given state,
as the quasiprobability function is operationally defined. We also propose a
marginal quasiprobability function and show that it plays the role of an
entanglement witness for two qudits. In addition, we discuss an optical
experiment of a polarization qubit to demonstrate its nonclassicality in terms
of the quasiprobability function.Comment: 10 pages, 4 figures, journal versio
Crash Performance of Strength Gradient Tube Induced by Selective Laser Patterning
This paper presents an investigation of the performance of a 22 MnB5 tube after local heat treatment according to a patterning shape under dynamic crash test conditions to propose the patterning shape with the best energy absorption efficiency. Numerical simulations support experimental results to validate the deformation mode during dynamic crash test as well as the strain distribution of the specimen. The helical patterning not only demonstrates the highest axial loading force and energy absorbance in both static and dynamic crash tests, but also can be easily fabricated in a short time. The helical pattern can optimize different pitch sizes according to the thickness and diameter of the cylindrical tube, and it has the highest energy absorption rate with 83.0% in dynamic conditions