Publications (2019)
Publications sorted by date descending
Hydrogenation of HOCO and formation of interstellar CO2: a not so straightforward relation
Authors: Molpeceres, German; Enrique-Romero, Joan; Ishibashi, Atsuki; Oba, Yasuhiro; Hidaka, Hiroshi; Lamberts, Thanja; Aikawa, Yuri; Watanabe, Naoki
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Publication date: 2025/03/18
Abstract: Carbon dioxide (CO2) is one of the most important interstellar molecules. While it is considered that it forms on the surface of interstellar dust grains, the exact contribution of different chemical mechanisms is still poorly constrained. Traditionally it is deemed that the CO + OH reaction occurring on top of ices is the main reaction path for its formation. Recent […]
Hydroxylamine in astrophysical ices: Infrared spectra and cosmic-ray-induced radiolytic chemistry
Authors: Mate, Belen; Pelaez, Ramon J.; Molpeceres, German; Racz, Richard; Mifsud, Duncan V.; Ortigoso, Juan; Rivilla, Victor M.; Lakatos, Gergo; Sulik, Bela; Herczku, Peter; Ioppolo, Sergio; Biri, Sandor; Juhasz, Zoltan
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2025/03/13
DOI: 10.1051/0004-6361/202453312
Abstract: Context. Gas-phase hydroxylamine (NH2OH) has recently been detected within dense clouds in the interstellar medium. However, it is also likely present within interstellar ices, as well as on the icy surfaces of outer Solar System bodies, where it may react to form more complex prebiotic molecules such as amino acids. Aims. […]
RIOJA. Complex Dusty Starbursts in a Major Merger B14-65666 at z=7.15
Authors: Sugahara, Yuma; alvarez-Marquez, Javier; Hashimoto, Takuya; Colina, Luis; Inoue, Akio K.; Costantin, Luca; Fudamoto, Yoshinobu; Mawatari, Ken; Ren, Yi W.; Arribas, Santiago; Bakx, Tom J. L. C.; Blanco-Prieto, Carmen; Ceverino, Daniel; Crespo Gomez, Alejandro; Hagimoto, Masato; Hashigaya, Takeshi; Marques-Chaves, Rui; Matsuo, Hiroshi; Nakazato, Yurina; Pereira-Santaella, Miguel; Tamura, Yoichi; Usui, Mitsutaka; Yoshida, Naoki
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2025/03/10
Abstract: We present JWST NIRCam imaging of B14-65666 (Big Three Dragons), a bright Lyman-break galaxy system (MUV = -22.5 mag) at z = 7.15. The high angular resolution of NIRCam […]
Quantum-classical rate coefficients for O2 + N2 inelastic collisions with very high vibrational levels
Authors: Yang, Jiawei; Hong, Qizhen; Bartolomei, Massimiliano; Pirani, Fernando; Coletti, Cecilia; Sun, Quanhua; Li, Jun
Journal: PHYSICAL REVIEW A
Publication date: 2025/03/06
DOI: 10.1103/PhysRevA.111.032804
Abstract: Energy exchanges among internal energy modes in O2 + N2 collisions directly affect the microscopic dynamical evolution of nonequilibrium phenomena in these gases. Quantum calculations of energy exchanges, especially those involving high molecular levels, are challenging due to their daunting computational costs. In this study, by capturing quantum effects associated with vibrational motions, we employ the improved mixed quantum-classical (MQC) method to obtain rate coefficients of […]
Passive Photonic CZ Gate with Two-Level Emitters in Chiral Multimode Waveguide QED
Authors: Levy-Yeyati, Tomas; Vega, Carlos; Ramos, Tomas; Gonzalez-Tudela, Alejandro
Journal: PRX QUANTUM
Publication date: 2025/03/05
DOI: 10.1103/PRXQuantum.6.010342
Abstract: Engineering deterministic photonic gates with simple resources is one of the long-standing challenges in photonic quantum computing. Here, we design a passive conditional gate between copropagating photons using an array of only two-level emitters. The key resource is to harness the effective photon-photon interaction induced by the chiral coupling of the emitter array to two waveguide modes with different resonant momenta at the emitter’s transition frequency. By studying the system’s multiphoton scattering response, […]
Pauli weight requirement of the matrix elements in time-evolved local operators: Dependence beyond the equilibration temperature
Authors: Ramos-Marimon, Carlos; Carignano, Stefano; Tagliacozzo, Luca
Journal: PHYSICAL REVIEW B
Publication date: 2025/03/05
DOI: 10.1103/PhysRevB.111.094301
Abstract: The complexity of simulating the out-of-equilibrium evolution of local operators in the Heisenberg picture is governed by the operator entanglement, which grows linearly in time for generic nonintegrable systems, leading to an exponential increase in computational resources. A promising approach to simplify this challenge involves discarding parts of the operator and focusing on a subspace formed by light Pauli strings-strings with few Pauli matrices-as proposed by Rakovszki et al. [Phys. Rev. B 105, 075131 […]
Electron Scattering Cross Sections from Thiazole for Impact Energies Ranging from 1 to 1000 eV
Authors: Garcia-Abenza, Adrian; Lozano, Ana I.; Oller, Juan C.; Rosado, Jaime; Blanco, Francisco; Limao-Vieira, Paulo; Garcia, Gustavo
Journal: MOLECULES
Publication date: 2025/03/01
DOI: 10.3390/molecules30051097
Abstract: Total electron scattering cross sections (TCSs), in the energy range of 1-100 eV, have been measured with a high-resolution magnetically confined electron transmission apparatus, with total uncertainty limits estimated to be within +/- 5%. No previous experimental TCS data have been found for comparison. Electron attachment resonances, corresponding to transient negative ion formation, have been identified for energies below 20 eV by analyzing their contribution to […]
Low crosstalk modular flip-chip architecture for coupled superconducting qubits
Authors: Ihssen, Soeren; Geisert, Simon; Jauma, Gabriel; Winkel, Patrick; Spiecker, Martin; Zapata, Nicolas; Gosling, Nicolas; Paluch, Patrick; Pino, Manuel; Reisinger, Thomas; Wernsdorfer, Wolfgang; Garcia-Ripoll, Juan Jose; Pop, Ioan M.
Journal: APPLIED PHYSICS LETTERS
Publication date: 2025/03/01
DOI: 10.1063/5.0245667
Abstract: We present a flip-chip architecture for an array of coupled superconducting qubits, in which circuit components reside inside individual microwave enclosures. In contrast to other flip-chip approaches, the qubit chips in our architecture are electrically floating, which guarantees a simple, fully modular assembly of capacitively coupled circuit components, such as qubit, control, […]
MADWAVE3: A quantum time dependent wave packet code for nonadiabatic state-to-state reaction dynamics of triatomic systems
Authors: Roncero, Octavio; del Mazo-Sevillano, Pablo
Journal: COMPUTER PHYSICS COMMUNICATIONS
Publication date: 2025/03/01
DOI: 10.1016/j.cpc.2024.109471
Abstract: We present MADWAVE3, a FORTRAN90 code designed for quantum time-dependent wave packet propagation in triatomic systems. This program allows the calculation of state-to-state probabilities for inelastic and reactive collisions, as well as photodissociation processes, over one or multiple coupled diabatic electronic states. The code is highly parallelized using MPI and OpenMP. The execution requires the potential energy surfaces of the different electronic states involved, as well as the transition dipole moments for photodissociation processes. The […]
Electron Attachment to Nitric Oxide (NO) Controversy
Authors: Lozano, Ana I.; Oller, Juan C.; Limao-Vieira, Paulo; Garcia, Gustavo
Journal: JOURNAL OF PHYSICAL CHEMISTRY A
Publication date: 2025/02/28
Abstract: We report novel total electron scattering cross sections (TCS) from nitric oxide (NO) in the impact energy range from 1 to 15 eV by using a magnetically confined electron transmission apparatus. The accuracy of the data to within 5% and its consistency across the energy range investigated, shows significant discrepancies from previous works as to the major resonance features and magnitude of the TCS. Within the shape of […]
Improving quantum metrology protocols with programmable photonic circuits
Authors: de las Heras, Alberto Munoz; Porras, Diego; Gonzalez-Tudela, Alejandro
Journal: NANOPHOTONICS
Publication date: 2025/02/20
Abstract: Photonic quantum metrology enables the measurement of physical parameters with precision surpassing classical limits by using quantum states of light. However, generating states providing a large metrological advantage is hard because standard probabilistic methods suffer from low generation rates. Deterministic protocols using non-linear interactions offer a path to overcome this problem, but they are currently limited by the errors introduced during the interaction time. Thus, finding strategies to minimize the interaction time of […]
Hydrogenation of acetaldehyde on interstellar ice analogs results in limited destruction
Authors: Molpeceres, G.; Nguyen, T.; Oba, Y.; Watanabe, N.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2025/02/20
DOI: 10.1051/0004-6361/202451990
Abstract: Context. Acetaldehyde (CH3CHO) is one of the most abundant interstellar complex organic molecules and its hydrogenation has important implications in several fundamental processes of interstellar chemistry, such as deuterium fractionation, reactive desorption, or the relation between organic functional groups of detected molecules. Aims. We seek to determine what the main hydrogenation paths of CH3CHO are. As a partially unsaturated molecule, CH3CHO can have links with more hydrogenated species, such as ethanol (C2H5OH), […]
Validity condition for high-fidelity digitized quantum annealing
Authors: Santos, Alan C.
Journal: PHYSICAL REVIEW A
Publication date: 2025/02/18
DOI: 10.1103/PhysRevA.111.022618
Abstract: Digitizing an adiabatic evolution is a strategy able to combine the good performance of gate-based quantum processors with the advantages of adiabatic algorithms, thus providing a hybrid model for efficient quantum information processing. In this work we develop validity conditions for high-fidelity digital adiabatic tasks. To this end, we assume a digitizing process based on the Suzuki-Trotter decomposition, which allows us to introduce a digitized adiabatic theorem. As a consequence of this theorem, we show that the […]
Bound polariton states in the Dicke-Ising model
Authors: Roman-Roche, Juan; Gomez-Leon, Alvaro; Luis, Fernando; Zueco, David
Journal: NANOPHOTONICS
Publication date: 2025/02/17
Abstract: We present a study of hybrid light-matter excitations in cavity QED materials using the Dicke-Ising model as a theoretical framework. Leveraging linear response theory, we derive the exact excitations of the system in the thermodynamic limit. Our results demonstrate that the cavity can localize spin excitations, leading to the formation of bound polaritons, where the cavity acts as an impurity of the two-excitation band, localizing spin-wave pairs around single-spin domains. We derive the condition […]
Validation of millimetre and sub-millimetre atmospheric collision-induced absorption at Chajnantor
Authors: Pardo, J. R.; De Breuck, C.; Muders, D.; Gonzalez, J.; Perez-Beaupuits, J. P.; Cernicharo, J.; Prigent, C.; Serabyn, E.; Montenegro-Montes, F. M.; Mroczkowski, T.; Phillips, N.; Villard, E.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2025/02/13
DOI: 10.1051/0004-6361/202452159
Abstract: Due to the importance of a reference atmospheric radiative transfer model for both planning and calibrating ground-based observations at millimetre and sub-millimetre wavelengths, we have undertaken a validation campaign consisting of acquiring atmospheric spectra under different weather conditions, in different diurnal moments and seasons, with the Atacama Pathfinder EXperiment (APEX), due to […]