Quantum materials engineering is emerging as a central bottleneck in quantum computing, shifting focus from qubit design to finding manufacturable materials that can preserve fragile quantum states.
Atomic-scale defects, stray atoms, rough surfaces and electromagnetic noise drive decoherence, so ideal qubit materials must combine ultra-high purity, long coherence, precise controllability and compatibility with large-scale fabrication.
Six leading material approaches now define the hardware race: superconducting metals, purified semiconductors, trapped ions, neutral atoms, photonic materials and topological compounds—each trading off coherence, fidelity, scalability and operating complexity.
Silicon-28 benefits from low nuclear spin noise and existing chip infrastructure, while superconductors reduce resistance losses but need costly cryogenic systems; photonics can run near room temperature, and topological materials still lack decisive experimental proof.
The field marks a broader shift from the quantum computing 'method era' of the 1980s-1990s to a materials era in which atomic-level control may determine whether practical machines can be built.