A quantum computer with only 100 perfect quantum bits could beat the largest existing classical computer for certain specific tasks. However, quantum speedup also requires an unprecedented accuracy in the control of quantum states. Quantum error correction codes are supposed to provide logical qubits that meet this challenge. In this talk, I will first briefly discuss the main stream approach to quantum error correction – surface codes – and show that although «topologically protected» from a mathematical perspective, they are vulnerable to local errors from a physics perspective. I will then describe how flying qubits might be more resilient to errors than localized qubits. The bulk of the talk will be devoted to the description of the progress made in Grenoble towards the realization of an electronic flying qubit.

This seminar is partially supported by JST CREST Grant Number JPMJCR1876, Japan.