Publications (2020)
Publications sorted by date descending
Integral Cross Sections for Electron-Zinc Scattering over a Broad Energy Range (0.01-5000 eV)
Authors: McEachran, R. P.; Marinkovic, B. P.; Garcia, G.; White, R. D.; Stokes, P. W.; Jones, D. B.; Brunger, M. J.
Contribution: Article
Journal: JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA
Publication date: 2020/03/01
DOI: 10.1063/1.5135573
Abstract: We report results from the application of our optical potential and relativistic optical potential methods to electron-zinc scattering. The energy range of this study was 0.01-5000 eV, with original results for the summed discrete electronic-state integral excitation cross sections and total ionization cross sections being presented here. When combined with our earlier elastic scattering […]
Multimode Fock states with large photon number: effective descriptions and applications in quantum metrology
Authors: Perarnau-Llobet, M.; Gonzalez-Tudela, A.; Cirac, J., I
Contribution: Article
Journal: QUANTUM SCIENCE AND TECHNOLOGY
Publication date: 2020/03/01
Abstract: We develop general tools to characterise and efficiently compute relevant observables of multimode N-photon states generated in nonlinear decays in one-dimensional waveguides. We then consider optical interferometry in a Mach-Zender interferometer where a d-mode photonic state enters in each arm of the interferometer. We derive a simple expression for the quantum Fisher information in terms of the average photon number in each mode, and show that it can be saturated […]
Tailored graphenic structures directly grown on titanium oxide boost the interfacial charge transfer
Authors: Munoz, Roberto; Sanchez-Sanchez, Carlos; Merino, Pablo; Lopez-Elvira, Elena; Munuera, Carmen; Gant, Patricia; Lopez, Maria F.; Castellanos-Gomez, Andres; Angel Martin-Gago, Jose; Garcia-Hernandez, Mar
Contribution: Article
Journal: APPLIED SURFACE SCIENCE
Publication date: 2020/02/28
DOI: 10.1016/j.apsusc.2019.144439
Abstract: The successful application of titanium oxide-graphene hybrids in the fields of photocatalysis, photovoltaics and photodetection strongly depends on the interfacial contact between both materials. The need to provide a good coupling between the enabling conductor and the photoactive phase prompted us to directly grow conducing graphenic structures on TiO2 crystals. We here report on the direct […]
Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
Authors: Dassonneville, R.; Ramos, T.; Milchakov, V.; Planat, L.; Dumur, E.; Foroughi, F.; Puertas, J.; Leger, S.; Bharadwaj, K.; Delaforce, J.; Naud, C.; Hasch-Guichard, W.; Garcia-Ripoll, J. J.; Roch, N.; Buisson, O.
Contribution: Article
Journal: PHYSICAL REVIEW X
Publication date: 2020/02/25
DOI: 10.1103/PhysRevX.10.011045
Abstract: Qubit readout is an indispensable element of any quantum information processor. In this work, we experimentally demonstrate a nonperturbative cross-Kerr couplingbetween a transmon and polariton mode which enables an improved quantum nondemolition (QND) readout for superconducting qubits. The new mechanism uses the same experimental techniques as the […]
Quantum threshold reflection of He-atom beams from rough surfaces
Authors: Rojas-Lorenzo, G.; Rubayo-Soneira, J.; Miret-Artes, S.; Pollak, E.
Contribution: Article
Journal: PHYSICAL REVIEW A
Publication date: 2020/02/24
DOI: 10.1103/PhysRevA.101.022506
Abstract: Quantum reflection of thermal He atoms from various surfaces (glass slide, GaAs wafer, flat, and structured Cr) at grazing conditions is studied within the elastic close-coupling formalism. Comparison with the experimental results of Zhao et al. [Phys. Rev. Lett. 105, 133203 (2010)] is quite reasonable but the conclusions of the present theoretical analysis are different from those discussed in the experimental work. The universal linear behavior observed in the dependence […]
Closed timelike curves and chronology protection in quantum and classical simulators
Authors: Martin-Vazquez, Gonzalo; Sabin, Carlos
Contribution: Article
Journal: CLASSICAL AND QUANTUM GRAVITY
Publication date: 2020/02/20
Abstract: In principe, general relativity seems to allow the existence of closed timelike curves (CTC). However, when quantum effects are considered, it is likely that their existence is prevented by some kind of chronological protection mechanism, as Hawking conjectured. Confirming or refuting the conjecture would require a full quantum theory of gravity. Meanwhile, the use of simulations could shed some light on this issue. We propose simulations of CTCs in a quantum system as […]
Dissipative two-identical-particle systems: diffraction and interference
Authors: Mousavi, S. V.; Miret-Artes, S.
Contribution: Article
Journal: EUROPEAN PHYSICAL JOURNAL PLUS
Publication date: 2020/01/17
DOI: 10.1140/epjp/s13360-020-00125-0
Abstract: Interference and diffraction of two-identical-particles are considered in the context of open quantum systems. This theoretical study is carried out within two approaches, the effective time-dependent Hamiltonian due to Caldirola-Kanai (CK) and the Caldeira-Leggett (CL) one where a master equation for the reduced density matrix is used under the presence of dissipation and temperature of the environment. Two simple but very illustrative examples are considered, diffraction by a single and two Gaussian […]
Rotational-state-changing collisions between N-2(+) and Rb at low energies
Authors: Doerfler, A. D.; Yurtsever, E.; Villarreal, P.; Gonzalez-Lezana, T.; Gianturco, F. A.; Willitsch, S.
Contribution: Article
Journal: PHYSICAL REVIEW A
Publication date: 2020/01/16
DOI: 10.1103/PhysRevA.101.012706
Abstract: We present a theoretical study of rotationally elastic and inelastic collisions between molecular nitrogen ions and Rb atoms in the sub-Kelvin temperature regime prevalent in ion-atom hybrid trapping experiments. The cross sections for rotational excitation and de-excitation collisions were calculated using quantum-scattering methods on ab initio potential energy surfaces for the energetically lowest singlet electronic channel of the system. We find that the rotationally […]
Observation of hydroperoxyethyl formate from the reaction between the methyl Criegee intermediate and formic acid
Authors: Cabezas, Carlos; Endo, Yasuki
Contribution: Article
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2020/01/14
DOI: 10.1039/c9cp05030b
Abstract: Rapid reactions of carboxylic acids with Criegee intermediates provide efficient gas phase removal processes and are proposed to trigger the formation of new molecular compounds, which are implicated in the growth of atmospheric aerosols. The new adducts formed in these reactions are known as hydroperoxide esters and are predicted to be condensable, with lower vapor pressures than the reactants. We report here the direct detection of hydroperoxyethyl formate (HOOCH(CH3)OCHO) formed in the gas […]
Femtochemistry under scrutiny: Clocking state-resolved channels in the photodissociation of CH3I in the A-band
Authors: Murillo-Sanchez, Marta L.; Gonzalez-Vazquez, Jesus; Corrales, Maria E.; de Nelda, Rebeca; Martinez-Nunez, Emilio; Garcia-Vela, Alberto; Banares, Luis
Contribution: Article
Journal: JOURNAL OF CHEMICAL PHYSICS
Publication date: 2020/01/07
DOI: 10.1063/1.5134473
Abstract: Clocking of electronically and vibrationally state-resolved channels of the fast photodissociation of CH3I in the A-band is re-examined in a combined experimental and theoretical study. Experimentally, a femtosecond pump-probe scheme is employed in the modality of resonant probing by resonance enhanced multiphoton ionization (REMPI) of the methyl fragment in different vibrational states and detection through fragment velocity map ion (VMI) […]