Dom Andrzejczuk

What an exciting time to be alive. We're starting to explore a regime of physics that has always been out of reach: large, highly entangled quantum systems that we can build and control ourselves. Quantum mechanics itself is on very solid ground. It has passed every experimental test for a century, and it already underpins the modern world, from the chips in your phone to lasers and MRI. We know the rules. What we often can't do is calculate what they produce once many particles become deeply entangled. Fully describing the state of just 300 entangled qubits can take more numbers than there are atoms in the observable universe, and no classical computer can keep up. Quantum computers are the first machines that let us create these states on purpose and study them directly. Scaling them to millions of qubits takes us into territory no one has ever been able to test. There are two possible outcomes, and both are extraordinary. If quantum mechanics holds at that scale, as most physicists expect, we gain an instrument for physics we've never been able to compute: new phases of matter, new materials and molecules, and open puzzles like high-temperature superconductivity, still not fully explained 40 years after its discovery. Early machines have already produced exotic states, like time crystals and non-Abelian anyons, that once existed only in theory. If it doesn't hold, and these systems behave in ways the theory can't explain, that would be the biggest discovery in physics since quantum mechanics itself. And there's precedent for this. Electromagnetism was always around us, in lightning and lodestones, long before we understood it well enough to build motors, power grids and radio. The nucleus sat inside every atom for billions of years before the 20th century turned it into nuclear power and medicine. Entanglement fits the same pattern: it's already everywhere in nature, and we're only now learning to engineer it at scale. We can't predict where that leads, and history suggests we'd guess wrong. The inventors of the transistor and the laser didn't foresee the smartphone or the internet. The biggest impact of mastering entanglement will likely be something no one has imagined yet, or dare I say even capable of imagining.