  The modeling of physical processes is an integral part of scientific and
technical research. In this area, the Extendible C++ Application in Quantum
Technologies (ECAQT) package provides the numerical simulations and modeling of
complex quantum systems in the presence of decoherence with wide applications
in photonics. It allows creating models of interacting complex systems and
simulates their time evolution with a number of available time-evolution
drivers. Physical simulations involving massive amounts of calculations are
often executed on distributed computing infrastructures. It is often difficult
for non expert users to use such computational infrastructures or even to use
advanced libraries over the infrastructures, because they often require being
familiar with middleware and tools, parallel programming techniques and
packages. The P-RADE Grid Portal is a Grid portal solution that allows users to
manage the whole life-cycle for executing a parallel application on the
computing Grid infrastructures. The article describes the functionality and the
structure of the web portal based on ECAQT package.
