Joint theoretical and experimental study on elastic electron scattering from bismuth

2020-07-20T11:26:53+02:00Tags: , , |

Authors: Predojevic, B.; Sevic, D.; Marinkovic, B. P.; McEachran, R. P.; Blanco, F.; Garcia, G.; Brunger, M. J. Contribution: Article Journal: PHYSICAL REVIEW A Publication date: 2020/03/23 DOI: 10.1103/PhysRevA.101.032704 Abstract: We report on experimental elastic differential and integral cross sections for electron scattering from bismuth. The energy range of those measurements is 10-100 eV, while the [...]

Dissipative quantum backflow

2020-07-20T11:26:53+02:00Tags: , |

Authors: Mousavi, S., V; Miret-Artes, S. Contribution: Article Journal: EUROPEAN PHYSICAL JOURNAL PLUS Publication date: 2020/03/23 DOI: 10.1140/epjp/s13360-020-00336-5 Abstract: Dissipative backflow is studied in the context of open quantum systems. This theoretical analysis is carried out within two frameworks, the effective time-dependent Hamiltonian due to Caldirola-Kanai (CK) and the Caldeira-Leggett (CL) one where a master equation [...]

Gamma-Rays from Kilonovae and the Cosmic Gamma-Ray Background

2020-07-20T11:26:55+02:00Tags: |

Authors: Ruiz-Lapuente, Pilar; Korobkin, Oleg Contribution: Article Journal: ASTROPHYSICAL JOURNAL Publication date: 2020/03/20 DOI: 10.3847/1538-4357/ab744e Abstract: The recent detection of the gravitational-wave event GW170817, produced by the coalescence of two neutron stars, and of its optical-infrared counterpart, powered by the radioactive decay of r-process elements, has opened a new window onto gamma-ray astronomy: the direct detection [...]

Mediator-assisted cooling in quantum annealing

2020-07-20T11:26:55+02:00Tags: , , |

Authors: Pino, M.; Garcia-Ripoll, Juan J. Contribution: Article Journal: PHYSICAL REVIEW A Publication date: 2020/03/18 DOI: 10.1103/PhysRevA.101.032324 Abstract: We show a significant reduction of errors for an architecture of quantum annealers where bosonic modes mediate the interaction between qubits. These systems have a large redundancy in the subspace of solutions, supported by arbitrarily large bosonic occupations. [...]

Nuevo esquema de lectura para qubits superconductores

2020-03-19T19:30:09+01:00Tags: , , |

Una colaboración hispano-francesa, en la que participan los investigadores Tomás Ramos y Juan José García-Ripoll del Instituto de Física Fundamental del CSIC, ha propuesto y demostrado de manera experimental un nuevo esquema de lectura para qubits superconductores, que proporciona medidas fiables mediante un acoplamiento fuerte al detector, y a la vez minimiza otras fuentes de [...]

Shortcuts to adiabaticity: Concepts, methods, and applications

2020-03-12T09:26:40+01:00Tags: , |

Authors: Guery-Odelin, D.; Ruschhaupt, A.; Kiely, A.; Torrontegui, E.; Martinez-Garaot, S.; Muga, J. G. Contribution: Review Journal: REVIEWS OF MODERN PHYSICS Publication date: 2019/10/24 DOI: 10.1103/RevModPhys.91.045001 Abstract: Shortcuts to adiabaticity (STA) are fast routes to the final results of slow, adiabatic changes of the controlling parameters of a system. The shortcuts are designed by a set [...]

Theoretical priors in scalar-tensor cosmologies: Thawing quintessence

2020-07-20T11:26:55+02:00Tags: , |

Authors: Garcia-Garcia, Carlos; Bellini, Emilio; Ferreira, Pedro G.; Traykova, Dina; Zumalacarregui, Miguel Contribution: Article Journal: PHYSICAL REVIEW D Publication date: 2020/03/05 DOI: 10.1103/PhysRevD.101.063508 Abstract: The late time acceleration of the Universe can be characterized in terms of an extra, time-dependent, component of the Universe-dark energy. The simplest proposal for dark energy is a scalar-tensor theory-quintessence-which consists [...]

Origin of the Electron-Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering

2020-07-20T11:26:55+02:00Tags: , , , , |

Authors: Benedek, Giorgio; Miret-Artes, Salvador; Manson, J. R.; Ruckhofer, Adrian; Ernst, Wolfgang E.; Tamtoegl, Anton Contribution: Article Journal: JOURNAL OF PHYSICAL CHEMISTRY LETTERS Publication date: 2020/03/05 DOI: 10.1021/acs.jpclett.9b03829 Abstract: He atom scattering has been demonstrated to be a sensitive probe of the electron-phonon interaction parameter lambda at metal and metal-overlayer surfaces. Here it is shown that [...]

Nuevo libro: “Verdades y mentiras de la física cuántica”, por nuestro compañero Carlos Sabín

2020-03-11T12:18:30+01:00Tags: , , , , |

El nuevo libro de la colección ‘¿Qué sabemos de?’ (CSIC-Catarata) trae “malas noticias” para quienes creen que la física cuántica es “una manera de escapar a las leyes de la física y entrar en un mundo nuevo donde todo está permitido, todo es impredecible y la realidad puede modificarse a voluntad”. Su autor, nuestro compañero [...]

Multimode Fock states with large photon number: effective descriptions and applications in quantum metrology

2020-07-20T11:26:56+02:00Tags: , |

Authors: Perarnau-Llobet, M.; Gonzalez-Tudela, A.; Cirac, J., I Contribution: Article Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2020/03/01 DOI: 10.1088/2058-9565/ab6ce5 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 [...]