Publications (2019)
Publications sorted by date descending
Gapless deconfined phase in a Z N-symmetric Hamiltonian created in a cold-atom setup
Authors: Rakov, Mykhailo, V; Tagliacozzo, Luca; Lewenstein, Maciej; Zakrzewski, Jakub; Chanda, Titas
Journal: PHYSICAL REVIEW B
Publication date: 2024/11/05
DOI: 10.1103/PhysRevB.110.195114
Abstract: We investigate a quasi-two-dimensional system consisting of two species of alkali atoms confined in a specific optical lattice potential [Phys. Rev. A 95 , 053608 (2017)]. In the low-energy regime, this system is governed by a unique ZN gauge theory, where field theory arguments have suggested that it may exhibit two exotic gapless deconfined phases, namely a dipolar liquid phase and a Bose liquid phase, along with two gapped […]
Synthesis and Spectroscopic Characterization of Interstellar Candidate Ethynyl Thiocyanate: HCCSCN
Authors: Alonso, Elena R.; Insausti, Aran; Kolesnikova, Lucie; Leon, Iker; Mcguire, Brett A.; Shingledecker, Christopher N.; Agundez, Marcelino; Cernicharo, Jose; Rivilla, Victor M.; Cabezas, Carlos; Jimenez-Serra, Izaskun; Martin-Pintado, Jesus; Guillemin, Jean-Claude
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2024/11/01
Abstract: This work aims to spectroscopically characterize and provide for the first time direct experimental frequencies of the ground vibrational state and two excited states of the simplest alkynyl thiocyanate (HCCSCN) for astrophysical use. Both microwave (8-16 GHz) and millimeter-wave regions (50-120 GHz) of the spectrum have been measured and analyzed in […]
Optimal quantum circuit generation for pixel segmentation in multiband images
Authors: Altares-Lopez, Sergio; Garcia-Ripoll, Juan Jose; Ribeiro, Angela
Journal: APPLIED SOFT COMPUTING
Publication date: 2024/11/01
DOI: 10.1016/j.asoc.2024.112175
Abstract: A novel approach is proposed for multiband image processing via quantum models in real situations. Quantum circuits are automatically generated ad-hoc for each use case via multiobjective genetic algorithms. Using this universal method, image processing tasks such as segmentation can be carried out by considering the properties that constitute each pixel. The generated circuits present a low level of correlation between qubits, and thus can be considered quantum-inspired machine learning models. The effectiveness […]
AGN feeding along a one-armed spiral in NGC 4593: A study using ALMA CO(2-1) observations
Authors: Kianfar, K.; Andreani, P.; Fernandez-Ontiveros, J. A.; Combes, F.; Spinoglio, L.; Hatziminaoglou, E.; Ricci, C.; Bewketu-Belete, A.; Imanishi, M.; Pereira-Santaella, M.; Slater, R.; Malheiro, M.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/11/01
DOI: 10.1051/0004-6361/202451185
Abstract: Context. We investigate active galactic nuclei (AGN) feeding through the molecular gas (CO(2-1) emission) properties of the local Seyfert 1 galaxy NGC 4593, using Atacama Large Millimeter Array (ALMA) observations and other multi-wavelength data. Aims. Our study aims to understand the interplay between the AGN and the interstellar medium (ISM) in this galaxy, examining the […]
Polycyclic Aromatic Hydrocarbon Emission in the Central Regions of Three Seyferts and the Implication for Underlying Feedback Mechanisms
Authors: Zhang, Lulu; Garcia-Bernete, Ismael; Packham, Chris; Donnan, Fergus R.; Rigopoulou, Dimitra; Hicks, Erin K. S.; Davies, Ric I.; Shimizu, Taro T.; Alonso-Herrero, Almudena; Almeida, Cristina Ramos; Pereira-Santaella, Miguel; Ricci, Claudio; Bunker, Andrew J.; Leist, Mason T.; Rosario, David J.; Garcia-Burillo, Santiago; Munoz, Laura Hermosa; Combes, Francoise; Imanishi, Masatoshi; Labiano, Alvaro; Esparza-Arredondo, Donaji; Bellocchi, Enrica; Audibert, Anelise; Fuller, Lindsay; Gonzalez-Martin, Omaira; Honig, Sebastian; Izumi, Takuma; Levenson, Nancy A.; Lopez-Rodriguez, Enrique; Rouan, Daniel; Stalevski, Marko; Ward, Martin J.
Journal: ASTROPHYSICAL JOURNAL LETTERS
Publication date: 2024/11/01
Abstract: We analyze JWST Mid-Infrared […]
Dissipative stabilization of maximal entanglement between nonidentical emitters via two-photon excitation
Authors: Vivas-Viana, Alejandro; Martin-Cano, Diego; Munoz, Carlos Sanchez
Journal: PHYSICAL REVIEW RESEARCH
Publication date: 2024/10/22
DOI: 10.1103/PhysRevResearch.6.043051
Abstract: Two nonidentical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. In Vivas-Via & ntilde;a, Mart & iacute;n-Cano, and S & aacute;nchez entangled W states among strongly interacting quantum emitters embedded in a cavity. Here we delve deeper into a specific configuration with a particularly rich phenomenology: two interacting quantum emitters under coherent excitation at the two-photon resonance. This scenario […]
A biconical ionised gas outflow and evidence of positive feedback in NGC 7172 uncovered by MIRI/JWST
Authors: Munoz, L. Hermosa; Alonso-Herrero, A.; Pereira-Santaella, M.; Garcia-Bernete, I.; Garcia-Burillo, S.; Garcia-Lorenzo, B.; Davies, R.; Shimizu, T.; Esparza-Arredondo, D.; Hicks, E. K. S.; Haidar, H.; Leist, M.; Lopez-Rodriguez, E.; Ramos Almeida, C.; Rosario, D.; Zhang, L.; Audibert, A.; Bellocchi, E.; Boorman, P.; Bunker, A. J.; Combes, F.; Campbell, S.; Diaz-Santos, T.; Fuller, L.; Gandhi, P.; Gonzalez-Martin, O.; Hoenig, S.; Imanishi, M.; Izumi, T.; Labiano, A.; Levenson, N. A.; Packham, C.; Ricci, C.; Rigopoulou, D.; Rouan, D.; Stalevski, M.; Villar-Martin, M.; Ward, M. J.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/10/22
Discovery of two cyano derivatives of acenaphthylene (C12H8) in TMC-1 with the QUIJOTE line survey
Authors: Cernicharo, J.; Cabezas, C.; Fuentetaja, R.; Agundez, M.; Tercero, B.; Janeiro, J.; Juanes, M.; Kaiser, R. I.; Endo, Y.; Steber, A. L.; Perez, D.; Perez, C.; Lesarri, A.; Marcelino, N.; de Vicente, P.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/10/18
DOI: 10.1051/0004-6361/202452196
Abstract: We report the discovery in TMC-1 of two cyano derivatives of the PAH acenaphthylene (C12H8). We have found two series of lines with the QUIJOTE line survey that we assign to 1-C12H7CN and 5-C12H7CN. For the 1-isomer, we have detected and assigned 173 rotational transitions with J […]
Gas flows in the central region of the Seyfert galaxy NGC 4593 with MUSE
Authors: Mulumba, D.; Knapen, J. H.; Comeron, S.; Almeida, C. Ramos; Obonyo, W. O.; Pereira-Santaella, M.; Baki, P.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/10/17
DOI: 10.1051/0004-6361/202450076
Abstract: Context. Understanding how gas flows into galactic centres, fuels the active galactic nucleus (AGN), and is in turn expelled back through feedback processes is of great importance to appreciate the role AGN play in the growth and evolution of galaxies. Aims. We use Multi Unit Spectroscopic Explorer-adaptive optics (MUSE-AO) optical spectra of the inner 7 ”.5 x 7 ”.5 (1.3 kpc x 1.3 […]
Low temperature dynamics of H + HeH+? H2+ He reaction: On the importance of long-range interaction
Authors: Sahoo, Jayakrushna; Bossion, Duncan; Gonzalez-Lezana, Tomas; Talbi, Dahbia; Scribano, Yohann
Journal: JOURNAL OF CHEMICAL PHYSICS
Publication date: 2024/10/14
DOI: 10.1063/5.0233558
Abstract: While the growing realization of the importance of long-range interactions is being demonstrated in cold and ultracold bimolecular collision experiments, their influence on one of the most critical ion-neutral reactions has been overlooked. Here, we address the non-Langevin abrupt decrease observed earlier in the low-energy integral cross-sections and rate coefficients of the astrochemically important H + HeH+-> H-2(+) + He reaction. We attribute this to the presence of artificial […]
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 […]
Grazing incidence fast atom diffraction: general considerations, semiclassical perturbation theory and experimental implications
Authors: Pollak, E.; Roncin, P.; Allison, W.; Miret-Artes, S.
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2024/10/09
DOI: 10.1039/d4cp02183e
Abstract: Using semiclassical methods, an analytical approach to describe grazing incidence scattering of fast atoms (GIFAD) from surfaces is described. First, we consider a model with a surface corrugated in the scattering plane, which includes the surface normal and the incidence direction. The treatment uses a realistic, Morse potential, within a perturbation approach, and correctly reproduces the basic GIFAD phenomenology, whereby the scattering is directed primarily in the specular direction. Second, we […]
No evidence of active galactic nucleus features in the nuclei of Arp 220 from JWST/NIRSpec IFS
Authors: Perna, Michele; Arribas, Santiago; Lamperti, Isabella; Pereira-Santaella, Miguel; Ulivi, Lorenzo; Boker, Torsten; Maiolino, Roberto; Bunker, Andrew J.; Charlot, Stephane; Cresci, Giovanni; Rodriguez Del Pino, Bruno; D’Eugenio, Francesco; Ubler, Hannah; Fahrion, Katja; Ceci, Matteo
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2024/10/07
DOI: 10.1051/0004-6361/202450094
Abstract: Context. Arp 220 is the nearest ultra-luminous infrared galaxy. It shows evidence of 100 pc scale molecular outflows that are likely connected with galaxy-scale outflows traced by ionised and neutral gas. The two highly obscured nuclei of Arp 220 are sites of intense star formation, with extreme […]
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 […]
Different theoretical aspects of the intrinsic decoherence in the Milburn formalism
Authors: Mousavi, S. V.; Miret-Artes, S.
Journal: EUROPEAN PHYSICAL JOURNAL PLUS
Publication date: 2024/10/03
DOI: 10.1140/epjp/s13360-024-05654-6
Abstract: In this work, we consider different theoretical aspects and simple applications of the Milburn equation which is governed by a parameter controlling what is known as intrinsic decoherence. The main goal is to show some similarities also observed when external decoherence is considered. Linear entropy, Ehrenfest relations, probability density current, the Wigner representation as well as the relation to a Lindbladian master equation are analyzed in terms of this intrinsic decoherence, leading to new […]