Conferencia: "Nonequilibrium quantum transport. Symmetries and the thermodynamics of currents"

Fecha: Jueves 6 de Marzo de 2014
Lugar: Laboratorio de Física Estadística y Computacional (edificio Físicas)
Horario: 10:00 h.
Descripción:
Ponente: Dr. Daniel Manzano, Massachusetts Institute of Technology (MIT, EE.UU.)
In recent years the propagation of energy in quantum mechanical systems has become a growing field. Since quantum effects were first observed in 2006, even at room temperature, in the Fenna-Matthews-Olson (FMO) bacteriochlorophyll complex, which plays a key role in the photosynthetic process and which is found in green sulphur bacteria, a great effort is being made towards understanding this process in a theoretical way. A non-equilibrium framework has been applied to the problem of energy transfer in qubit networks and photosynthetic complexes. The results of this work indicate that the energy transfer in this kind of systems can be improved by the addition of dynamical noise, but that this improvement is less important as the efficiency of the system increases.
Also, symmetry is a powerful concept in physics, and its recent application to understand nonequilibrium behavior is providing deep insights and groundbreaking exact results. Here we show how to harness symmetry to control transport and statistics in open quantum systems via initial state preparation. In open quantum systems, a symmetry implies the existence of multiple, symmetry-classified non-equilibrium steady states. This coexistence of different transport channels, which enables symmetry-controlled transport, is a consequence of a dynamic phase transition in the statistics of current fluctuations, where the symmetry is broken to facilitate a given current deviation. We apply these results to study transport in an open network of qubits, motivated by the problem of energy harvesting in photosynthetic complexes, where twin dynamic phase transitions and symmetry-controlled transport are clearly demonstrated. These results prove that the concept of symmetry has far reaching consequences to understand non-equilibrium behavior in quantum systems, and suggest symmetry-based design strategies for quantum devices with controllable transport properties and dissipation-engineered for quantum computation.
Organiza: Departamento de Electromagnetismo y Física de la Materia
Más información: phurtado@onsager.ugr.es

Conferencia: «Nonequilibrium quantum transport. Symmetries and the thermodynamics of currents»

06 marzo 2014 | 09:00 - 10:00 h

Actividades culturales y de divulgación
Conferencias, seminarios, divulgación científica

Fechas y horarios

Conferencia: «Nonequilibrium quantum transport. Symmetries and the thermodynamics of currents»

06 marzo 2014 | 09:00 - 10:00 h

Actividades culturales y de divulgaciónConferencias, seminarios, divulgación científica

Fechas y horarios

Actividades culturales y de divulgación
Conferencias, seminarios, divulgación científica