From 11:45 am to 12:05 pm
Certification of Non-Gaussian States using Double Homodyne Detection – Ganaël Roeland
Specific properties of quantum states are necessary to unlock new technologies in quantum information. For instance, a crucial quantum feature to look for and investigate is the so-called non-Gaussianity, which is a necessary resource for any quantum computational advantage. It is thus essential to be able to certify such properties.
Using double homodyne detection, we derived a protocol for the certification of non-Gaussian features of quantum states, such as Wigner negativity or stellar rank. Simulations show that the protocol, that doesn't require a full tomography, is efficient enough to be achievable it in state-of-the-art quantum optics experiments.
Today's efforts are now concentrated on experimentally certifying the Wigner negativity of the states we generate in the lab, namely photon subtracted squeezed states.

From 12:10 pm to 12.30 pm 
Communication complexity problems: Quantum vs Classical - Verena Yacoub
Generally in Communication Complexity problems, we have distributed parties, each having an input set, and exchanging this information to calculate the solution of a multivariable function without having access to any information about their partner's data.
In this type of problem, we are mainly concerned with one of two questions: i) what is the minimal amount of communication required to solve the function ? ii) what is the maximum precision we can get in the solution with restricted communication resources?
We will explore some experimentally realised quantum protocols that could achieve this reduction of resources for specific functions and hence outperform their classical homologues.