Quantum computing has come a long way in just under thirty years. What was once a concept confined to the pages of science fiction is now a reality, with functional quantum computers being developed around the world. These machines have the potential to solve complex problems much faster than traditional supercomputers, particularly in areas like optimization and the simulation of materials and chemical reactions. Among the countries leading the charge in this technological race is France, where a strong quantum physics research community has given rise to several innovative startups. One of these is Quandela, a company that has already begun selling its quantum computing technology. Quandela specializes in photonic quantum computers, which use particles of light, known as photons, to perform calculations. Unlike classical computers, which rely on bits that are either 0 or 1, quantum computers use quantum bits, or qubits, which can exist in multiple states at once. This phenomenon, known as superposition, allows quantum computers to process vast amounts of information simultaneously, offering a significant leap in computational power. Understanding how these machines work is essential for appreciating their potential impact on science, technology, and industry. To help explain the inner workings of quantum computers, the publisher De Boeck created a series of videos called Questions d'experts, which features interviews with leading scientists on topics ranging from physics to astrophysics. In one such episode, Claude Aslangul, a professor at UPMC, was interviewed to break down the principles behind quantum computing. Aslangul, an expert in quantum mechanics, provided insight into how quantum computers differ from their classical counterparts and how they might be used to solve problems that are currently beyond the reach of traditional computing. As the field of quantum computing continues to evolve, companies like Quandela are at the forefront of developing practical applications for this groundbreaking technology. The next part of this article will explore the specific machines that Quandela has developed and their potential uses in various industries. With the support of France’s strong quantum physics research community, the future of quantum computing looks increasingly promising, with the potential to revolutionize fields as diverse as medicine, finance, and materials science.