CUSMEQ

Coherent ultrafast spectroscopy and manipulation of excitonic Q-bits

Coordinatore	more  Organization address address: Newport Road 30-36 city: CARDIFF postcode: CF24 ODE contact info Titolo: Mr. Nome: Nick Cognome: Bodycombe Email: send email Telefono: -20870156 Fax: -20874174
Nazionalità Coordinatore	Non specificata
Totale costo	1˙788 €
EC contributo	0 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Anno di inizio	2008
Periodo (anno-mese-giorno)	2008-03-01   -   2010-02-28

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	CARDIFF UNIVERSITY  Organization address address: Newport Road 30-36 city: CARDIFF postcode: CF24 ODE contact info Titolo: Mr. Nome: Nick Cognome: Bodycombe Email: send email Telefono: -20870156 Fax: -20874174	UK (CARDIFF)	coordinator	0.00

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 Obiettivo del progetto (Objective)

'The research field of the proposed subject is the coherent, ultrafast spectroscopy and manipulation of individual excitonic state confined within a semiconductor quantum dot. Due to technological advances in light detectors and microscopy techniques, the investigation of the emission properties of individual, localized light emitters is now routinely possible. These investigations have led to significantly improved insight into the electronic dynamics of these systems and their temporal instabilities due to the environment. The observation of coherence in these systems and the manipulation by coherent control is, however, still at an early stage. On the other hand, the latter techniques are a prerequisite for the use of optical transitions in single quantum dots as qubits in quantum information processing. Recently a novel optical detection scheme, heterodyne-detected spectrally resolved four-wave mixing (FWM) has been developed. It has the advantage of a multi-channel detection of all spectral FWM components simultaneously, a shot-noise limited sensitivity, and a retrieval of amplitude and phase of the FWM signal. These properties are achieved even in the presence of a strong background from the optical excitation pulses. Having this technique at hand, the coherent control and the implementation of all-optical quantum gates can be approached. The demonstration of quantum computational operations using individual quantum systems in solid state is the next step towards the realization of a solid state quantum computer. The project will include an advanced training of the fellow in the heterodyne-detected FWM technique. This technique will be applied to investigate and manipulate coherence properties not only of quantum dots, but also of quantum dot molecules and quantum dots embedded in a pillar microcavity.'