[Todos] Coloquios DF: Francesca Battista (FCEyN - UBA): Jueves 5/6, 14hs, Aula Seminario, 2do piso, Pab. I

[Augusto Roncaglia]

 COLOQUIOS DEL DEPARTAMENTO DE F�SICA FCEYN - UBA


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

              Jueves 5/6, 14hs:

              FRANCESCA BATTISTA

              DF - FCEyN - UBA.

*              Single particle sources - State of the art: the Levitons*

The miniaturization of electronic devices is a well known trend in
engineering since almost 50 years. The technological advancement in the
field can now guarantee an astonishing good control of charge transport in
mesoscopic structures. While a macroscopic electrical current is perceived
as a continuous quantity and it is given by a large, uncontrolled number of
propagating electrons characterized by large fluctuations, it is now
possible to realize mesoscopic devices able to induce current pulses given
by controlled number of electrons or holes during a desired time interval,
in a desired area of a circuit and characterized by very low fluctuations.
These devices are called single particle sources (SPSs) and have very
important applications in the fields of metrology and quantum information.
The precision of SPSs is limited by the fluctuations due to extra
electron-hole excitations induced by the time periodic driving of the
system. One of the possible experimental realizations of a SPS is the
application of a Lorentzian pulse to a conductor. In special cases this
creates an ideal noiseless quantized particle stream also referred to as
Levitons. In this colloquium I will provide a brief overview of different
experimental realizations of single particle sources with a special focus
on the Levitons.
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