Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 8: Enabling Technologies: Sources of Quantum States of Light I

FM 8.7: Talk

Monday, September 23, 2019, 15:45–16:00, 1010

Non-Gaussian Continuous-Variable Graph States — •Mattia Walschaers, Young-Sik Ra, Adrien Dufour, Claude Fabre, Valentina Parigi, and Nicolas Treps — Laboratoire Kastler Brossel - Sorbonne Université, CNRS, Ecole Normale Supérieure, Collège de France, Paris, France

Graph states are the backbone of measurement-based continuous-variable quantum computation. However, experimental realizations of these states induce Gaussian measurement statistics for the field quadratures, which poses a barrier to obtain a genuine quantum advantage. In this contribution, we propose mode-selective photon subtraction as an experimentally feasible pathway to introduce non-Gaussian features in such continuous-variable graph states. In particular, the induced non-Gaussian properties are shown to spread up to next-to-nearest neighbours of the graph's vertex in which the photon was subtracted. Finally, we explore the importance of entanglement in this transfer of non-Gaussianity, as compared to what can be achieved with classical light or classical correlations.