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Séminaire QUEST

Jeudi 30 novembre à 9h30,
Salle Rémy Lemaire, K223

Orateur : Christophe GALLAND (EPFL)
"Ultrafast photonic quantum correlations mediated by individual phonons"


We measure quantum correlations between single photons that are mediated by the exchange of a single phonon. We create and annihilate a single optical phonon in bulk diamond using two ultrashort laser pulses at two different wavelengths. During Stokes Raman scattering, the first pulse creates a photon-phonon pair, while the second pulse convert the same phonon into an anti-Stokes photon. Using spectral filtering and photon counting, we measure the cross-correlations between the Stokes and anti-Stokes photons with a few hundred femtoseconds time resolution. As expected, we observe non-classical correlations that decay within a few picosecond, following the dynamics of the phonon mode. Our results demonstrate a new source of broadly tunable quantum correlated photons.

Moreover, we present our efforts to extend this approach as a new way of measuring non-classical dynamics in nanoscale systems — down to individual nanostructures and molecules. We fabricate plasmonic gap nanocavities that confine the optical field down to nanoscale volumes, providing orders of magnitude signal enhancement in Raman scattering. We summarize the development of these nanocavities and our progress toward an experimental realization of “molecular quantum optomechanics” — opening the route to the first molecular “phonon laser”.

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