Publications (2019)
Publications sorted by date descending
Laser-assisted motional-mode spectroscopy in a Penning trap and the generalized invariance theorem
Authors: Berrocal, J.; Hernandez, A.; Porras, D.; Rodriguez, D.
Journal: PHYSICAL REVIEW A
Publication date: 2025/01/01
DOI: 10.1103/PhysRevA.110.063107
Abstract: In this paper we measure all the motional-mode frequencies (common and stretch) of a balanced and an unbalanced two-ion Coulomb crystal in a 7-tesla Penning trap using an electric-dipole transition in 40Ca+. The three common modes of the balanced crystal were obtained using a laser-pulse measurement technique developed in a previous work for a single ion, whereas the stretch mode frequencies were measured in a stationary state while applying laser cooling. Due […]
Quantum steering ellipsoids and quantum obesity in critical systems
Authors: Rosario, Pedro; Santos, Alan c.
Journal: EPL
Publication date: 2025/01/01
Abstract: – Quantum obesity (QO) is a novel function introduced to quantify quantum correlations that go beyond traditional measures like entanglement, while also functioning as an entanglement witness. One of the key strengths of QO lies in its analyticity for arbitrary states of bipartite systems, making it a more accessible and versatile tool compared to other measures of quantum correlations, such as quantum discord. In this work, we highlight the importance of QO as a fundamental quantity for […]
Encoding quantum bits in bound electronic states of a graphene nanotorus
Authors: Furtado, J.; Ramos, A. C. A.; Silva, J. E. G.; Bachelard, R.; Santos, Alan C.
Journal: ANNALS OF PHYSICS
Publication date: 2025/01/01
DOI: 10.1016/j.aop.2024.169862
Abstract: We propose to use the quantum states of an electron trapped on the inner surface of a graphene nanotorus to realize as a new kind of physical quantum bit, which can be used to encode quantum information. Fundamental tasks for quantum information processing, such as the qubit initialization and the implementation of arbitrary single qubit gates, can then be performed using external magnetic and electric […]
Quantum origin of anomalous Floquet phases in cavity-QED materials
Authors: Perez-Gonzalez, Beatriz; Platero, Gloria; Gomez-Leon, Alvaro
Journal: COMMUNICATIONS PHYSICS
Publication date: 2024/12/21
DOI: 10.1038/s42005-024-01908-y
Abstract: Anomalous Floquet topological phases are unique to periodically driven systems, lacking a static analog. Inspired by Floquet Engineering with classical electromagnetic radiation, Quantum Floquet Engineering has emerged as a promising tool to tailor the properties of quantum materials using quantum light. While the latter recovers the physics of Floquet materials in its semi-classical limit, the mapping between these two scenarios remains mysterious in many aspects. In this work, we discuss the emergence of quantum anomalous […]
Photodissociation of the CH2Cl radical: A high-level ab initio study
Authors: Charfeddine, F.; Yazidi, O.; Zanchet, A.; Banares, L.; Garcia-Vela, A.
Journal: JOURNAL OF CHEMICAL PHYSICS
Publication date: 2024/12/21
DOI: 10.1063/5.0243800
Abstract: Photodissociation of the CH2Cl radical is investigated by using high-level multireference configuration interaction ab initio methods, including the spin-orbit coupling. All possible fragmentation pathways, namely, CH2Cl + h nu -> CH2 + Cl, HCCl + H, and CCl + H-2, have been analyzed. The potential-energy curves of the ground and several excited electronic states along the corresponding dissociating bond distance of each pathway have been calculated. Inclusion of the […]
Toward a robust physical and chemical characterization of heterogeneous lines of sight: The case of the Horsehead nebula
Authors: Segal, Leontine; Roueff, Antoine; Pety, Jerome; Gerin, Maryvonne; Roueff, Evelyne; Goicoechea, Javier R.; Beslic, Ivana; Coude, Simon; Einig, Lucas; Mazurek, Helena; Orkisz, Jan H.; Palud, Pierre; Santa-Maria, Miriam G.; Zakardjian, Antoine; Bardeau, Sebastien; Bron, Emeric; Chainais, Pierre; Demyk, Karine; Magalhaes, Victor de Souza; Gratier, Pierre; Guzman, Viviana V.; Hughes, Annie; Languignon, David; Levrier, Francois; Le Bourlot, Jacques; Le Petit, Franck; Lis, Dariusz C.; Liszt, Harvey S.; Peretto, Nicolas; Sievers, Albrecht; Thouvenin, Pierre-Antoine
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/12/12
DOI: 10.1051/0004-6361/202451567
Abstract: Context. Dense and cold molecular cores and filaments […]
SNe Ia Twins for Life: Toward a Precise Determination of H0
Authors: Ruiz-Lapuente, P.; Hernandez, J. I. Gonzalez
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2024/12/01
Abstract: Here we present an approach to the measurement of extragalactic distances using twin SNe Ia, taken from the early down to the nebular phase. The approach is purely empirical, although we can give a theoretical background on why the method is reliable. By studying those twins in galaxies where peculiar velocities are relatively unimportant, we can tackle the H-0 tension problem. Here we apply the method to the determination of the distances to NGC 7250 […]
Proposed Importance of HOCO Chemistry: Inefficient Formation of CO2 from CO and OH Reactions on Ice Dust
Authors: Ishibashi, Atsuki; Molpeceres, German; Hidaka, Hiroshi; Oba, Yasuhiro; Lamberts, Thanja; Watanabe, Naoki
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2024/12/01
Abstract: With the advent of JWST ice observations, dedicated studies on the formation reactions of detected molecules are becoming increasingly important. One of the most interesting molecules in interstellar ice is CO2. Despite its simplicity, the main formation reaction considered, CO + OH -> CO2 + H through the energetic HOCO* intermediate on ice dust, is subject to uncertainty because it directly competes with the stabilization of HOCO as a […]
The Electron-Phonon Interaction in Non-Stoichiometric Bi2Sr2CaCu2O8+? Superconductor Obtained from the Diffuse Elastic Scattering of Helium Atoms
Authors: Benedek, Giorgio; Manson, Joseph R.; Miret-Artes, Salvador; Schmicker, Detlef; Toennies, Jan Peter
Journal: CONDENSED MATTER
Publication date: 2024/12/01
Abstract: Previously, helium atom scattering (HAS) has been shown to probe the electron-phonon interaction at conducting crystal surfaces via the temperature dependence of the specular peak intensity. This method is now extended to non-stoichiometric superconductors. The electron-phonon interaction, as expressed by the mass-enhancement factor lambda, is derived from the temperature dependence of the diffuse elastic scattering intensity, which specifically depends on the non-stoichiometric component responsible for superconductivity. The measured value […]
Borophene nanoclusters: Energetics and structures from analytical potentials
Authors: Zergani, Farideh; Marques, Jorge M. C.; Bartolomei, Massimiliano; Pirani, Fernando
Journal: JOURNAL OF CHEMICAL PHYSICS
Publication date: 2024/11/28
DOI: 10.1063/5.0239149
Abstract: Boron shows a variety of properties, determining a chemistry rich and complementary to that of carbon, the neighbor atom in the Periodic Table. In this work, we investigated the strength and nature of the interaction involving B-12 or B-36 monomer, which represent molecular prototypes of borophene, the two-dimensional allotrope of elemental boron. For the representation of the intermolecular interaction, we developed new potential energy surfaces (PESs) that are based […]
Mitigating noise in digital and digital-analog quantum computation
Authors: Garcia-Molina, Paula; Martin, Ana; de Andoin, Mikel Garcia; Sanz, Mikel
Journal: COMMUNICATIONS PHYSICS
Publication date: 2024/10/06
DOI: 10.1038/s42005-024-01812-5
Abstract: Noisy Intermediate-Scale Quantum (NISQ) devices lack error correction, limiting scalability for quantum algorithms. In this context, digital-analog quantum computing (DAQC) offers a more resilient alternative quantum computing paradigm that outperforms digital quantum computation by combining the flexibility of single-qubit gates with the robustness of analog simulations. This work explores the impact of noise on both digital and DAQC paradigms and demonstrates DAQC’s effectiveness in error mitigation. We compare the quantum Fourier […]
Geometrical description and Faddeev-Jackiw quantization of electrical networks
Authors: Parra-Rodriguez, A.; Egusquiza, I. L.
Journal: QUANTUM
Publication date: 2024/09/05
DOI:
Abstract: In lumped-element electrical circuit theory, the problem of solving Maxwell’s equations in the presence of media is reduced to two sets of equations, the constitutive equations encapsulating local geometry and dynamics of a confined energy density, and the Kirchhoff equations enforcing conservation of charge and energy in a larger, topological, scale. We develop a new geometric and systematic description of the dynamics of general lumped-element electrical circuits as first order differential equations, derivable from a Lagrangian and a Rayleigh dissipation […]
Support effects on conical intersections of Jahn-Teller fluxional metal clusters on the sub-nanoscale
Authors: Krupka, Katarzyna M.; de Lara-Castells, Maria Pilar
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2024/10/09
DOI: 10.1039/d4cp03271c
Abstract: The concept of fluxionality has been invoked to explain the enhanced catalytic properties of atomically precise metal clusters of subnanometer size. Cu-3 isolated in the gas phase is a classical case of a fluxional metal cluster where a conical intersection leads to a Jahn-Teller (JT) distortion resulting in a potential energy landscape with close-lying multiminima and, ultimately, fluxional behavior. In spite of the role of conical intersections in the (photo)stability and (photo)catalytic […]
The Galaxy Activity, Torus, and Outflow Survey (GATOS): V. Unveiling PAH survival and resilience in the circumnuclear regions of AGNs with JWST
Authors: Garcia-Bernete, I.; Rigopoulou, D.; Donnan, F. R.; Alonso-Herrero, A.; Pereira-Santaella, M.; Shimizu, T.; Davies, R.; Roche, P. F.; Garcia-Burillo, S.; Labiano, A.; Hermosa Munoz, L.; Zhang, L.; Audibert, A.; Bellocchi, E.; Bunker, A.; Combes, F.; Delaney, D.; Esparza-Arredondo, D.; Gandhi, P.; Gonzalez-Martin, O.; Honig, S. F.; Imanishi, M.; Hicks, E. K. S.; Fuller, L.; Leist, M.; Levenson, N. A.; Lopez-Rodriguez, E.; Packham, C.; Ramos Almeida, C.; Ricci, C.; Stalevski, M.; Martin, M. Villar; Ward, M. J.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/11/11
DOI: 10.1051/0004-6361/202450086
Abstract: This study analyses JWST […]
Quantifying the informativity of emission lines to infer physical conditions in giant molecular clouds: I. Application to model predictions
Authors: Einig, Lucas; Palud, Pierre; Roueff, Antoine; Pety, Jerome; Bron, Emeric; Le Petit, Franck; Gerin, Maryvonne; Chanussot, Jocelyn; Chainais, Pierre; Thouvenin, Pierre-Antoine; Languignon, David; Beslic, Ivana; Coude, Simon; Mazurek, Helena; Orkisz, Jan H.; Santa-Maria, Miriam G.; Segal, Leontine; Zakardjian, Antoine; Bardeau, Sebastien; Demyk, Karine; de Souza Magalhaes, Victor; Goicoechea, Javier R.; Gratier, Pierre; Guzman, Viviana V.; Hughes, Annie; Levrier, Francois; Le Bourlot, Jacques; Lis, Dariusz C.; Liszt, Harvey S.; Peretto, Nicolas; Roueff, Evelyne; Sievers, Albrecht
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/11/11
DOI: 10.1051/0004-6361/202451588
Abstract: Context. Observations of ionic, atomic, or […]