[Todos] Coloquios DF - Michele Campisi (SNS), Jueves 12/3, 14hs, Aula Seminario, 2do piso, Pab. I

Mar Mar 10 12:11:03 ART 2015

COLOQUIOS DEL DEPARTAMENTO DE FÃSICA FCEYN - UBA

              En el Aula Seminario, 2do piso, Pab. I,

              Jueves 12/3, 14hs:

              MICHELE CAMPISI

              Scuola Normale Superiore

*              Quantum heat engines. Microscopic theory, illustrative
example and solid state implementation*

At the very foundation of the theory of thermodynamics lies the observed
fact that no machine can beat the efficiency of a Carnot engine. We address
the question of what is the microscopic origin of this observed macroscopic
fact. This is not a only a fundamental question but also a very practical
one: Understanding the operation of thermal machines at the microscopic
scale can help us design efficient and powerful nano heat engines.

We shall see how the Carnot bound follows as a consequence of the
fluctuation theorem which in turn is a manifestation of microscopic
reversibility. To get insight into the microscopic mechanisms underlying
the operation of quantum heat engines we study a device composed of two
qubits, each coupled to a thermal bath, and subject to a SWAP quantum gate.
We discuss its implementation with superconducting qubits and calorimetric
measurements of heat exchange. Quite remarkably, the power output of this
engine can be increased without compromising its efficiency.
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