Many of the investors chasing quantum computing stocks for their portfolio own big-name tickers like IonQ or Rigetti Computing. That’s certainly one way to tap into this sector of the market. But the real millionaire-making potential in this sector actually lies in the companies that underpin the industry’s infrastructure, and it includes stock names many investors haven’t heard of.
When analyzing quantum stocks, remember that, while a few big industry darlings get all the attention, many smaller tickers are quietly building the foundation for what could soon become a massive industry. McKinsey estimates the quantum computing market could grow into a $72 billion annual opportunity by 2035 — a market that, for all practical purposes, barely exists today. When an industry is this nascent, investors who pick the right players could be looking at millionaire-level upside over the next decade.
Here are three infrastructure-focused companies operating on the frontier of this space that deserve a closer look.
Image source: Getty Images.
1. Infleqtion
Infleqtion (INFQ 4.82%) went public on Feb. 17, 2026, making it the first neutral-atom quantum company to trade on a major exchange.
Most people don’t know what that means, so here’s the short version: Companies like IonQ trap individual ions and Rigetti uses superconducting circuits cooled to near absolute zero. But Infleqtion uses neutral atoms, regular atoms held in place by laser beams. The advantage is scalability. Neutral atoms can be arranged in large, flexible arrays without the extreme cooling infrastructure required by superconducting systems.​
What makes Infleqtion unusual is that it isn’t just a quantum computing company. Its product portfolio spans quantum computers, quantum optical clocks, RF receivers, and inertial sensors. These systems are already deployed with NASA, the U.S. Department of Defense, and the U.K. government. The company also has multiple collaborations with Nvidia, including publishing the world’s first demonstration of a materials science application using logical qubits.
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Infleqtion went public with more than $550 million in new funding. It secured a $2 million U.S. Army contract for navigation in contested environments and is executing a $6.2 million ARPA-E contract applying quantum computing to energy grid optimization.
It even has a partnership with Voyager Technologies to put its Tiqker quantum atomic clock aboard the International Space Station. This isn’t a slideshow company. It ships hardware to places where failure isn’t theoretical. Its potential for growth makes it a millionaire-making stock.
2. Quantum Computing Inc.
Quantum Computing Inc. (QUBT 1.23%) takes a fundamentally different approach from nearly every other quantum company. Instead of superconducting circuits or trapped ions, QCi builds quantum systems using photonics. That is basically the manipulation of particles of light rather than subatomic particles. The critical advantage: Photonic quantum systems can operate at room temperature, eliminating the need for the massive, expensive cryogenic cooling that most quantum hardware demands.​
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In February 2026, QCi completed its $110 million all-cash acquisition of Luminar Semiconductor, a subsidiary of Luminar Technologies. This was a supply chain play. Luminar Semiconductor manufactures lasers, detectors, and advanced packaging, the exact photonic components QCi needs to build compact, mass-producible quantum systems. By combining its own thin-film lithium niobate (TFLN) platform with Luminar’s capabilities, QCi now controls the entire photonics signal chain from light generation through detection and processing.
The company also raised $1.55 billion in capital in 2025, giving it an enormous financial cushion relative to its size. The manufacturing platform is fully domestic, aligning with reshoring initiatives and positioning QCi for government and defense contracts.
This is a company building toward vertically integrated, room-temperature quantum hardware. If that bet works, the upside is millionaire-making.
3. Sealsq Corp
Here’s a question most quantum investors aren’t asking: What happens to cybersecurity when quantum computers become powerful enough to break current encryption? The answer is that every device connected to the internet becomes vulnerable overnight. Sealsq Corp (LAES 5.31%) is building hardware designed to prevent that.
Sealsq specializes in post-quantum semiconductors — chips embedded with quantum-resistant cryptographic algorithms designed to protect data, devices, and networks against “harvest-now, decrypt-later” attacks. That’s when adversaries collect encrypted data today with the intention of decrypting it once quantum computers are powerful enough. It’s already happening.​
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The company confirmed active U.S. deployments of its post-quantum semiconductor-based trust anchors in January 2026, coinciding with the official launch of the “Year of Quantum Security 2026” in Washington, D.C. Its products are deployed across multi-factor authentication tokens, smart energy systems, medical devices, defense infrastructure, and automotive applications.
The company also announced a partnership with Trusted Semiconductor Solutions to supply U.S. government and enterprise customers with post-quantum-ready semiconductor platforms.
While everyone else is building quantum computers, Sealsq is building the locks. Both markets need to exist for the other to matter.​