No abstract

We apply reverse-engineering to find electromagnetic pulses that allow for the control of populations in quantum systems under dephasing and thermal noises. In particular, we discuss two-level systems given their importance in the description of several molecular systems as well as quantum computing. Such an investigation naturally finds applications in a multitude of physical situations involving the control of quantum systems. We present an analytical description of the pulse which solves a constrained dynamics where the initial and final populations are fixed a priori. This constrained dynamics is sometimes impossible and we precisely spot the conditions for that. One of our main results is the presentation of analytical conditions for the establishment of steady states for finite coherence in the presence of noise. This might naturally find applications in quantum memories.

We consider the problem of energy transport in coupled two-level systems with the goal of shedding light on how nonclassical resources can benefit quantum transport. First, we focus on coherence in the basis composed of eigenstates of the decoupled system Hamiltonian. By using a coherence quantifier, we present an illustrative example of a linear chain of coupled two-level systems to investigate how this resource is associated with an advantage in terms of transport efficiency, when compared to the classical scenario. Finally, we consider the integrated coherence generated by the dynamics and show how it is related to the quantification of the invasiveness of the quantum operation governing the time evolution in the quantum scenario. To illustrate, we analyze the relationship between quantum invasiveness and transport efficiency. We finish this contribution by presenting a concrete example using superconducting qubits where our findings may be experimentally investigated.

El conducto onfalomesentérico está presente desde la tercera semana y comunica la cavidad celómica con el intestino medio, la persistencia  del conducto onfalomesentérico da lugar a un número de alteraciones dependientes del lugar donde se produce, sea intestinal o umbilical, se presenta el caso de una RN de sexo femenino en quien se observa un ombligo exudativo persistente, ante la sospecha clínica se realizan exámenes complementarios dentro de los cuales se emplearon estudios imagenológicos contrastados que demostraron una comunicación que posteriormente se definió como persistencia del conducto onfalomesentérico. Recibido: 10-08-2017 / Aceptado: 12-09-2017