Adjonction cohérente itérative de photons pour la génération d'états quantiques mésoscopiques du champ électromagnétique

Jean Etesse 1
1 Laboratoire Charles Fabry / Optique Quantique
LCF - Laboratoire Charles Fabry
Abstract : In this thesis, we propose a new scheme for the generation of mesoscopic optical quantum states of light, by the iterated use of an elementary protocol, based on a coherent adjunction of photons. This protocol takes advantage of the two complementary wave and particle descriptions of light, by involving intrinsically discrete states (photons, elementary particles of light) and continuous measurements on the electromagnetic field (quadrature measurements). We experimentally prove the validity of the protocol by showing that it enables the generation of squeezed optical Schrödinger cat states (coherent superposition of quasi-classical states). These states are of great interest as they can be used as the elementary piece in the coherent state quantum calculation, the "qubit" (or quantum bit). We also study the theoretical implementation of the protocol for the production of more complex states : the "quadrature Comb states", whose wavefunction along the quadrature x consists in a succession of thin gaussian peaks modulated by a larger gaussian envelope. Amongst other applications like quantum error correcting codes, we show that they allow for a violation of Bell's inequalities with homodyne measurements only, opening the path towards loophole-free violations
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Jean Etesse. Adjonction cohérente itérative de photons pour la génération d'états quantiques mésoscopiques du champ électromagnétique. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0016⟩. ⟨tel-01126991⟩

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