61,517 research outputs found
Scene Graph Generation by Iterative Message Passing
Understanding a visual scene goes beyond recognizing individual objects in
isolation. Relationships between objects also constitute rich semantic
information about the scene. In this work, we explicitly model the objects and
their relationships using scene graphs, a visually-grounded graphical structure
of an image. We propose a novel end-to-end model that generates such structured
scene representation from an input image. The model solves the scene graph
inference problem using standard RNNs and learns to iteratively improves its
predictions via message passing. Our joint inference model can take advantage
of contextual cues to make better predictions on objects and their
relationships. The experiments show that our model significantly outperforms
previous methods for generating scene graphs using Visual Genome dataset and
inferring support relations with NYU Depth v2 dataset.Comment: CVPR 201
Time-dependent Fr\"ohlich transformation approach for two-atom entanglement generated by successive passage through a cavity
Time-dependent Fr\"ohlich transformations can be used to derive an effective
Hamiltonian for a class of quantum systems with time-dependent perturbations.
We use such a transformation for a system with time-dependent atom-photon
coupling induced by the classical motion of two atoms in an inhomogeneous
electromagnetic field. We calculate the entanglement between the two atoms
resulting from their motion through a cavity as a function of their initial
position difference and velocity.Comment: 7 pages, 3 figure
Quantum anti-Zeno effect without rotating wave approximation
In this paper, we systematically study the spontaneous decay phenomenon of a
two-level system under the influences of both its environment and continuous
measurements. In order to clarify some well-established conclusions about the
quantum Zeno effect (QZE) and the quantum anti-Zeno effect (QAZE), we do not
use the rotating wave approximation (RWA) in obtaining an effective
Hamiltonian. We examine various spectral distributions by making use of our
present approach in comparison with other approaches. It is found that with
respect to a bare excited state even without the RWA, the QAZE can still happen
for some cases, e.g., the interacting spectra of hydrogen. But for a physical
excited state, which is a renormalized dressed state of the atomic state, the
QAZE disappears and only the QZE remains. These discoveries inevitably show a
transition from the QZE to the QAZE as the measurement interval changes.Comment: 14 pages, 8 figure
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