PBS NOVA

The Truth About Quantum Computers

The video examines the latest claim from Microsoft that it has finally tamed the elusive Majorana fermion to build topological qubits, a development it says could unlock practical quantum computers as early as 2025. It explains how quantum computers differ from classical machines by exploiting superposition and entanglement, allowing qubits to represent 0, 1, or both simultaneously. The chief obstacle—decoherence—causes qubits to lose their quantum state, and existing platforms such as superconducting circuits and photonic systems struggle with extreme cooling requirements or photon loss, limiting scalability. Microsoft’s approach hinges on Majorana particles, which are their own antiparticles and theoretically immune to many sources of decoherence. While the company has not yet released peer‑reviewed data, the video notes that industry skeptics remain, yet the potential payoff includes ultra‑fast factorisation of encryption keys, molecular‑level simulations for chemistry and medicine, and breakthroughs in battery technology. If the breakthrough proves viable, it could accelerate a wave of quantum‑driven innovation while simultaneously forcing a rapid overhaul of cryptographic standards. The stakes are high: the first entity to wield large‑scale quantum power will gain a decisive competitive edge, making responsible governance a critical concern.