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Prof. Daniel Felinto Pires Barbosa

Universidade Federal de Pernambuco, UFPE, Brazil

Thursday, June 27th, 2013 at 11:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 05:21:55 PM on Tuesday, June 25th, 2013

Coherent control of atoms for applications in spectroscopy and quantum information

The coherent manipulation of atomic systems for Direct Frequency Comb Spectroscopy and quantum information protocols.

The coherent manipulation of atomic systems have a broad range of applications. Here I will initially discuss the use of trains of arbitrarily-shaped femtosecond pulses for high-resolution spectroscopy, through the technique called Direct Frequency Comb Spectroscopy (DFCS). The coherent accumulation of excitation in the sample is investigated and identified as the physical process behind the DFCS technique. Finally a general theory is introduced to model the action of arbitrarily-shaped frequency combs over atomic systems.

In a second part of the seminar, the mechanism of extraction of information stored in a DLCZ-type quantum memory is studied in detail. We consider then memories containing a single excitation of a collective atomic state, which is mapped into a single photon during the reading process. In this way, we are able to systematically study the saturation and spectrum of the reading process, as well as clarify the role of superradiance in the system. Applications of this system to quantum information protocols are discussed in the end.

For further informations, please contact Dr. Marco Bellini.