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Generalizing wave-particle duality: Two-qubit extension of the polarization coherence theorem
(MDPI, 2020-12-01)
We present an extension of the polarization coherence theorem (PCT) for the case in which two qubits play similarly important roles. The standard version of the PCT: V2 + D2 = P2, involves three measures, visibility V, distinguishability D, and the degree of polarization P, all of which refer to a single qubit, regardless of its physical realization. This is also the case with the inequality that is implied by the PCT: V2 + D2 ≤ 1, which was originally derived in an attempt to quantify Bohr’s complementarity principle. We show that all of these constraints hold true, no matter how the involved qubits are physically realized, either as quantum or else as classical objects.
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Synthesis and characterization of pure, two-qubit states encoded in path and polarization
(IOP Publishing Ltd, 2021-08-01)
We have designed and experimentally put to test a protocol to synthesize and characterize pure, two-qubit states encoded in polarization and momentum (path) of light beams. Because these degrees of freedom are common to both classical and quantum light, it was possible to implement our protocol with classical light, thereby offering an advantageous and versatile testing ground. The experimental setup is robust and does not require state-dependent scheme modifications. We exhibited the capabilities of our protocol by generating three types of two-qubit states: Bell states, states with variable phases, and states with variable amplitudes.
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Preferences for redistribution policies among politicians and citizens
(Elsevier B.V., 2026-09-01)
This paper compares the “mental maps” of redistribution among politicians and citizens across seven parliaments, using original in-person surveys of sitting MPs and nationally representative citizen samples. Fairness beliefs and ideology are the strongest correlates of support for redistribution in both groups, while misperceptions of wealth concentration matter for citizens but much less for politicians. A central finding is that politicians hold markedly more polarized views on redistribution than citizens, including within the same party families. We also find systematic elite-voter gaps: left MPs are more supportive than their voters (notably on inheritance taxation), whereas right/liberal MPs are less supportive than theirs. These patterns point to a representation concern and to a narrower bargaining space among elites than in the electorate.
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Wave–Particle Duality in Tripartite Systems
(Optica Publishing Group (formerly OSA), 2023-04-01)
Quantum objects, sometimes called quantons, often display a characteristic feature referred to as wave–particle duality (WPD). Lately, this and other quantum traits have been subjected to intensive research, mainly motivated by the development of quantum information science. As a consequence, the scopes of some concepts have been extended, and it has been realized that they are not in the exclusive domain of quantum physics. This is particularly clear in optics, where qubits may show up as Jones vectors and WPD has its counterpart as wave–ray duality. WPD was originally addressed by focusing on a single qubit, which was afterwards supplemented with a second one playing the role of a path-marker in an interferometer setup. Fringe contrast, a sign of wave-like behavior, was proved to be diminished in connection with the effectiveness of the marker, the inducer of particle-like behavior. Going from bipartite to tripartite states is a natural and necessary step towards better understanding of WPD. This step is what we have accomplished in this work. We report some constraints ruling WPD for tripartite systems, as well as their experimental display with single photons.
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Measurement of Inclusive J/ψ Pair Production Cross Section in pp Collisions at s = 13 TeV
(American Physical Society, 2023-10-01)
The production cross section of inclusive J/ψ pairs in pp collisions at a center-of-mass energy s=13 TeV is measured with ALICE. The measurement is performed for J/ψ in the rapidity interval 2.5<y<4.0 and for transverse momentum pT>0. The production cross section of inclusive J/ψ pairs is reported to be 10.3±2.3(stat.)±1.3(syst.) nb in this kinematic interval. The contribution from nonprompt J/ψ (i.e., originated from beauty-hadron decays) to the inclusive sample is evaluated. The effective double-parton scattering cross section is computed, neglecting the single-parton scattering contribution.
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Tannin-rich pigments for improvement of electrochemical properties of anticorrosive paint systems
(Springer, 2025)
Hydrolysable tannins are natural polyphenols susceptible to hydrolysis that can be extracted from different vegetable plants. Tara pods, of Peruvian origin, concentrate a high tannin content and, besides their low exploitation impact, their tannin extract has shown high potential industrial applications due to their ability to form complexes with a broad variety of metal ions. However, developing an anticorrosive pigment of low-cost, high efficiency and reduced environmental impact is still a challenge. Herein, tannin-rich pigments were synthesized with Tara powder and zinc ions to produce metallic complexes known as tannates for corrosion protection. The anticorrosive behavior of zinc tannates was studied by direct current electrochemical techniques on pigment extracts and electrochemical impedance spectroscopy tests by analyzing pigmented primers and painting systems. Scanning electron microscopy and energy dispersive analysis were performed to study the protective layers morphology. Results indicated that zinc tannates inhibit satisfactorily steel corrosion overcoming the recognized behaviour of conventional pigments. As part of a painting system, alkyd primers with zinc tannates presented the best inhibitory properties. Zinc tannates could have the necessary requirements to be considered anticorrosive pigments, becoming a green alternative for corrosion prevention.
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