Expérimental
High-harmonic generation is a light up-conversion process occurring in a strong laser field, leading to coherent attosecond bursts of extreme broadband radiation. As a new paradigm, attosecond electronic or photonic processes such as high-harmonic generation (HHG) can potentially generate non-classical states of light well before the decoherence of the system occurs. This could address fundamental challenges in quantum technology such as scalability, decoherence or the generation of massively entangled states with ultrafast processing. The internship will consist in realizing a platform that will allow controlling the carrier to envelope phase (CEP) of the laser that drives the semiconductor HHG emission. The CEP of the laser will allow controlling the non-classical state, in connection with our recent finding in various semiconductors (Theidel et al, submitted to Nature, in review). Single and multi-beam intensity cross-correlation, two-mode squeezing in the generated harmonic radiation, which depends on the laser intensity will be investigated. We will test the violation of the Cauchy-Schwarz inequality that realizes a direct test of multipartite entanglement in high-harmonic generation. The attosecond control of light states open the vision of quantum processing on unprecedented timescales, an evident perspective for future quantum optical computers. Only candidates motivated to follow with a PhD in this topic will be considered.