2,867 research outputs found
A search for new hot subdwarf stars by means of Virtual Observatory tools
Hot subdwarf stars are faint, blue objects, and are the main contributors to
the far-UV excess observed in elliptical galaxies. They offer an excellent
laboratory to study close and wide binary systems, and to scrutinize their
interiors through asteroseismology, as some of them undergo stellar
oscillations. However, their origins are still uncertain, and increasing the
number of detections is crucial to undertake statistical studies. In this work,
we aim at defining a strategy to find new, uncatalogued hot subdwarfs. Making
use of Virtual Observatory tools we thoroughly search stellar catalogues to
retrieve multi-colour photometry and astrometric information of a known sample
of blue objects, including hot subdwarfs, white dwarfs, cataclysmic variables
and main sequence OB stars. We define a procedure to discriminate among these
spectral classes, particularly designed to obtain a hot subdwarf sample with a
low contamination factor. In order to check the validity of the method, this
procedure is then applied to two test sky regions: the Kepler FoV and to a test
region of around (RA:225, DEC:5) deg. As a result, we obtained 38 hot subdwarf
candidates, 23 of which had already a spectral classification. We have acquired
spectroscopy for three other targets, and four additional ones have an
available SDSS spectrum, which we used to determine their spectral type. A
temperature estimate is provided for the candidates based on their spectral
energy distribution, considering two-atmospheres fit for objects with clear
infrared excess. Eventually, out of 30 candidates with spectral classification,
26 objects were confirmed to be hot subdwarfs, yielding a contamination factor
of only 13%. The high rate of success demonstrates the validity of the proposed
strategy to find new uncatalogued hot subdwarfs. An application of this method
to the entire sky will be presented in a forthcoming work.Comment: 13 pages, 7 figure
Few-qubit quantum-classical simulation of strongly correlated lattice fermions
We study a proof-of-principle example of the recently proposed hybrid
quantum-classical simulation of strongly correlated fermion models in the
thermodynamic limit. In a "two-site" dynamical mean-field theory (DMFT)
approach we reduce the Hubbard model to an effective impurity model subject to
self-consistency conditions. The resulting minimal two-site representation of
the non-linear hybrid setup involves four qubits implementing the impurity
problem, plus an ancilla qubit on which all measurements are performed. We
outline a possible implementation with superconducting circuits feasible with
near-future technology.Comment: 20 pages, 10 figure
Quantum Simulation of Quantum Field Theories in Trapped Ions
We propose the quantum simulation of a fermion and an antifermion field modes
interacting via a bosonic field mode, and present a possible implementation
with two trapped ions. This quantum platform allows for the scalable add-up of
bosonic and fermionic modes, and represents an avenue towards quantum
simulations of quantum field theories in perturbative and nonperturbative
regimes.Comment: To be published in Physical Review Letter
Smart Learning Environments y ergonomía: una aproximación al estado de la cuestión
Educational technology evolves constantly, in line with the innovative technologies we implement, but always catering for the improvement of teaching and learning. For this, Smart Learning Environments (SLE) emerge as an optimal alternative to traditional teaching as, through ergonomics, an inclusive outlook which is bound to enhance the educational experience of every student is provided. The method utilized is based on a systematic review of the existing literature which has allowed us to analyze in depth a final sample of 19 documents after an initial review of 633, being these all the works published between 2013 and 2019. Therefore, the principal objective of the present work is carrying out an analysis of the state of the art in relation to ergonomics, inclusiveness and the SLE. The analysis of results is performed utilizing a semantic network, generated through atlas.ti. v.8, by means of which 3 categories, 10 codes and 33 quotes are extracted. Namely, the results reveal the emerging nature of the thematic line researched and how ergonomics is linked to inclusiveness and stands out as one of the most defining components when designing an educational proposal based on SLE.La tecnología educativa se ve de forma continua transformada en función de las tecnologías innovadoras que vamos incorporando, pero siempre con la vista puesta en la mejora del proceso de enseñanza y aprendizaje. Para ello, los Smart Learning Environments (SLE) se convierten en una alternativa óptima a la enseñanza tradicional, puesto que a través de la ergonomía se brinda una perspectiva inclusiva que mejorará la experiencia educativa de cualquier estudiante. Por lo tanto, el principal objetivo de este trabajo consiste en realizar un análisis del estado del arte en relación con la ergonomía, la inclusión y los SLE. El método utilizado se basa en una revisión sistemática de literatura que nos ha permitido analizar en profundidad una muestra final de 19 documentos tras una revisión inicial de 633, habiendo sido todos los trabajos publicados entre 2013 y 2019. El análisis de los resultados se realiza a través de una red semántica generada con atlas.ti. v.8, a partir de la cual se extraen 3 categorías, 10 códigos y 33 citas. Principalmente, los resultados reflejan el carácter emergente de la línea temática investigada y cómo la ergonomía se relaciona con la inclusión y se posiciona como uno de los principales componentes para diseñar una propuesta educativa basada en los SLE
Photodetection of propagating quantum microwaves in circuit QED
We develop the theory of a metamaterial composed of an array of discrete
quantum absorbers inside a one-dimensional waveguide that implements a
high-efficiency microwave photon detector. A basic design consists of a few
metastable superconducting nanocircuits spread inside and coupled to a
one-dimensional waveguide in a circuit QED setup. The arrival of a {\it
propagating} quantum microwave field induces an irreversible change in the
population of the internal levels of the absorbers, due to a selective
absorption of photon excitations. This design is studied using a formal but
simple quantum field theory, which allows us to evaluate the single-photon
absorption efficiency for one and many absorber setups. As an example, we
consider a particular design that combines a coplanar coaxial waveguide with
superconducting phase qubits, a natural but not exclusive playground for
experimental implementations. This work and a possible experimental realization
may stimulate the possible arrival of "all-optical" quantum information
processing with propagating quantum microwaves, where a microwave photodetector
could play a key role.Comment: 27 pages, submitted to Physica Scripta for Nobel Symposium on "Qubits
for Quantum Information", 200
Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
We measure the dispersive energy-level shift of an resonator
magnetically coupled to a superconducting qubit, which clearly shows that our
system operates in the ultrastrong coupling regime. The large mutual kinetic
inductance provides a coupling energy of ~GHz, requiring the
addition of counter-rotating-wave terms in the description of the
Jaynes-Cummings model. We find a 50~MHz Bloch-Siegert shift when the qubit is
in its symmetry point, fully consistent with our analytical model.Comment: Published version (4 pages, 4 figures), including supplementary
material (2 pages, 4 figures
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