Quantum hardware is not yet useful. The supply chain getting it there is being built right now — in superconducting and trapped-ion labs, in cryogenics fabs, in photonics foundries, and in the defense and cryptography programs that have to prepare for the moment the math actually works. Below: the five layers, US-listed only.
Pure-play hardware at the apex. Federal programs at the foundation. The supply chain getting quantum to useful.
The four publicly-traded firms whose entire enterprise value is staked on getting useful quantum computation to market. Each represents a different qubit architecture: trapped-ion, superconducting, annealing, and photonic. High variance, high asymmetric optionality.
IBM Quantum, Microsoft Majorana, Google Quantum AI, and AWS Braket. The four firms with cloud-accessible quantum platforms and the research budgets to operate them at scale. Quantum is a rounding error in their revenue today — and the most strategic line item on their roadmaps.
The picks-and-shovels layer. Probe cards for testing quantum chips at scale, lasers and photonics for trapped-ion and photonic architectures, and the precision test infrastructure that has to keep up with millikelvin operating temperatures.
The federal services contractors and software firms migrating US government and enterprise infrastructure to NIST-standardized post-quantum cryptographic algorithms. The deadline is not theoretical — agencies have published transition timelines.
Defense primes with active quantum research contracts — quantum sensing for navigation, quantum communications for unbreakable links, and IARPA-funded foundational research that does not need to clear a commercial threshold to ship.
Constituent lists are reviewed quarterly against revenue mix, segment disclosures, research funding awards, and patent activity. Quotes are sourced from licensed market data; the Veridion Score is computed from six published factors. Quantum is the highest-variance theme on the platform — inclusion is not a recommendation.