72 research outputs found
Green's functions technique for calculating the emission spectrum in a quantum dot-cavity system
We introduce the Green's functions technique as an alternative theory to the
quantum regression theorem formalism for calculating the two-time correlation
functions in open quantum systems. In particular, we investigate the potential
of this theoretical approach by its application to compute the emission
spectrum of a dissipative system composed by a single quantum dot inside of a
semiconductor cavity. We also describe a simple algorithm based on the Green's
functions technique for calculating the emission spectrum of the quantum dot as
well as of the cavity which can easily be implemented in any numerical linear
algebra package. We find that the Green's functions technique demonstrates a
better accuracy and efficiency in the calculation of the emission spectrum and
it allows to overcome the inherent theoretical difficulties associated to the
direct application of the quantum regression theorem approach
Road Network Deterioration Monitoring Using Aerial Images and Computer Vision
Road maintenance is an essential process for guaranteeing the quality of
transportation in any city. A crucial step towards effective road maintenance
is the ability to update the inventory of the road network. We present a proof
of concept of a protocol for maintaining said inventory based on the use of
unmanned aerial vehicles to quickly collect images which are processed by a
computer vision program that automatically identifies potholes and their
severity. Our protocol aims to provide information to local governments to
prioritise the road network maintenance budget, and to be able to detect early
stages of road deterioration so as to minimise maintenance expenditure.Comment: 5 pages, 4 figure
Characterization of dynamical regimes and entanglement sudden death in a microcavity quantum - dot system
The relation between the dynamical regimes (weak and strong coupling) and
entanglement for a dissipative quantum - dot microcavity system is studied. In
the framework of a phenomenological temperature model an analysis in both,
temporal (population dynamics) and frequency domain (photoluminescence) is
carried out in order to identify the associated dynamical behavior. The Wigner
function and concurrence are employed to quantify the entanglement in each
regime. We find that sudden death of entanglement is a typical characteristic
of the strong coupling regime.Comment: To appear in Journal of Physics: Condensed Matte
- …