Quantum computers might be capable of solving computational problems that are intractable to classical computers. Common examples are the simulation of chemical reactions or exotic materials. In the last two decades, the progress towards building a quantum computer has been outstanding. In the early 2000s, physicists were learning how to build and control single quantum bits : the elementary system that encodes a single bit of quantum information, also known as "qubit". In 2024, chips of hundreds of qubits are now available, that even outperform classical computers on very specific tasks. In this seminar, I will describe the hopes and challenges in building a quantum computer. I will delve into a particularly successful platform for quantum computing, known as superconducting circuits. Finally, I will describe some of my own research on constructing a "Schrödinger cat-qubit", a promising candidate for universal quantum computing [Nature 629 778-783 (2024)].