Four ways to invest in quantum, and three of them aren't ready

There's going to be a lot of money made and lost in the quantum sector over the next decade, and most of the people moving that money right now are looking at it through the wrong frame.

Open any quantum investing conversation and it's the same shape. IonQ versus Rigetti. Trapped ions versus superconducting qubits. Whether D-Wave counts. Whether the hardware companies are real businesses or hype-driven SPAC residue. The argument is always which horse, and because nobody can confidently pick a horse, most serious investors decide the sector is unanalyzable and walk away until something obvious happens.

This is the wrong altitude. The hardware horse race is one part of the story, and not the part most likely to pay first. The people staying at the hardware altitude are going to look slow when the sector starts producing real returns, because the sector isn't one investable theme. It's four, with very different time horizons, very different risk profiles, and very different rules for when to act.

This post is the map of those four. Each one has its own thesis, its own clock, its own catalysts, and its own list of names worth tracking. Some are interesting today. Some won't matter for years. Knowing which is which is most of the work.

1. Post-quantum cryptography migration. Rebuilding internet encryption to withstand future quantum computers. The most-discussed near-term quantum trade. Has the cleanest deadlines (the U.S. National Security Agency's mandate kicks in January 1, 2027 for federal acquisitions), the most named buyers, and the most obvious story arc. As we'll see, it's also the trade most overstated by the consensus.

2. Quantum computing hardware commercialization. The companies actually building quantum processors (IonQ, Rigetti, D-Wave, Infleqtion), plus the divisions inside larger companies (IBM, Google, Microsoft). The most volatile part of the sector. This is where you see dramatic re-ratings and blow-ups and exciting earnings calls. Selectively investable on milestone-driven catalysts, not as broad thematic exposure.

3. Quantum sensing. Using quantum effects to measure things like time, gravity, and magnetic fields with extraordinary precision. The part of the sector almost nobody calls quantum. Already commercial, and already producing revenue. Selling to defense and aerospace customers today using physics that works with current technology. It's also what's quietly keeping some of the hardware names financially solvent.

4. Quantum networking. Long-distance secure communication using quantum mechanics (quantum key distribution, eventually a "quantum internet"). Real research, no near-term equity story. Monitor only.

Think of them as four separate trades sharing a label. Each runs on its own clock, with its own list of names worth tracking. They don't combine into a single "quantum stock pick" you can buy and hold as one position. Each answers a different question.

A short reading on each, in order of how close it is to being investable. I'll publish a deeper post on each in this series; this article is the orientation to all four.

The migration is the rebuilding of internet encryption to withstand future quantum computers. Most of today's internet security depends on a couple of math problems (factoring large numbers, the basis of RSA; and discrete logarithms on elliptic curves, the basis of ECC) that a sufficiently large quantum computer could solve quickly. The U.S. National Institute of Standards and Technology (NIST) has selected new algorithms designed to resist both classical and quantum attack, and the world is now rolling those algorithms out across browsers, servers, content delivery networks, VPNs, and federal systems.

This is real. It's funded. The deadlines are now compressed: the NSA's mandate starts in 2027; Cloudflare has committed to its own migration by 2029, six years ahead of NIST's 2035 target; and research from Oratomic and Google has suggested the qubit count needed to threaten real cryptographic keys may be far smaller than previously estimated.

So why isn't it the cleanest investable trade in the sector? Because nobody's getting paid extra to do the migration. The companies doing the migration (Cloudflare, Akamai, Fastly, AWS, Azure, the major networking vendors) absorb PQC compliance as a feature their customers expect them to provide as part of existing services. They don't get to charge more for it. The migration shows up as engineering hours and capex, not as new revenue. The stocks don't move on it.

My read: most-discussed and least cleanly investable of the four. The narrow exceptions are federal contracts above meaningful size thresholds awarded to public pure-plays, plus specialty cybersecurity firms with PQC-specific products. I'll walk through the exceptions in detail in a dedicated article.

The hardware-pure-play story is the one most people associate with the word "quantum." IonQ, Rigetti, D-Wave, Infleqtion. Plus Quantinuum (private, owned by Honeywell at the time of writing) and the quantum divisions inside Big Tech.

This is genuinely interesting and genuinely difficult to invest in well. Real revenue is happening: IonQ booked $130 million in 2025 and is guiding $225–245 million for 2026. Infleqtion is at roughly $29 million in trailing revenue with quantum sensing as a meaningful contributor. D-Wave booked $32 million-plus year to date in 2026, although how much of that converts to recognized revenue is the open question.

The architecture race is also unsettled. Trapped-ion (IonQ, Quantinuum), neutral-atom (Infleqtion, QuEra, Atom Computing partnered with Microsoft), superconducting (IBM, Google, Rigetti), and photonic (PsiQuantum) approaches all have backers, all have technical defensibility arguments, and all are competing for a milestone nobody has reached: fault-tolerant quantum computation. A 2:1 physical-to-logical qubit ratio from a QuEra/Harvard/MIT simulation, published in April 2026, has shifted momentum toward neutral-atom approaches. Hardware today is closer to 7:1; the simulation is a marker of where the architecture is heading, not where it is.

But the layer is milestone-driven, not thematically investable. Pure-play valuations are hype-sensitive. Specific names get acted on when specific catalysts fire: IonQ's Q1 2026 earnings on May 6, Rigetti's C-DAC system shipment in the second half of 2026, Infleqtion's first full quarter as a public company, D-Wave's bookings actually converting to revenue. Outside those moments, the default action is to hold or wait.

My read: selectively investable on milestone-driven catalysts, not as broad thematic exposure. The detailed reads on each name live in the watchlist.

This is the part of the sector that surprised me when I first got into it.

Quantum sensors are devices that use quantum-mechanical effects to measure things like time, gravity, magnetic fields, and orientation with extraordinary precision. The submarine that can navigate without surfacing for GPS, the surface ship that can hold a position when GPS is jammed: these are the kinds of applications already in the field. They're already commercial. Defense and aerospace customers are buying them today, using technology that doesn't require fault-tolerant quantum computing or any of the breakthroughs the sector is still chasing. The physics works at room temperature. The products exist. Companies are being paid for them.

Infleqtion is the cleanest public exposure. Its Safran timing partnership, announced in April, is a concrete commercial deployment of quantum atomic clocks for navigation and timing systems: the kind of revenue-producing arrangement that matters more than yet another roadmap announcement from a hardware vendor. Other public proxies exist further upstream (parts of FormFactor's business, certain semiconductor-equipment vendors with quantum-relevant exposure), and a private universe of pure-play sensing companies sits alongside.

My read on sensing: the part of the sector with the strongest current economics and the lowest narrative attention. That gap is the opportunity. There's no need to wait for the technology to mature; the products are shipping. The important thing is to identify the public-market vehicles that capture the demand, without taking on the architecture-race risk that the broader hardware layer carries.

This stream gets the shortest treatment because the takeaway is the most straightforward: monitor only.

Quantum key distribution uses individual photons to share encryption keys in a way that's physically detectable if intercepted. It's a working technology with niche government and research deployments. A "quantum internet," in which quantum computers connect via entanglement-distribution networks, is a real research goal but does not yet exist at any practical scale.

There's no near-term equity story. Most public companies with QKD or quantum-networking exposure have it as a small part of larger businesses where it doesn't influence the financials. The catalyst that would move this from monitor-only to actively-tracked would be a major public-procurement program with named vendors, or the emergence of a public pure-play with credible commercial traction. Neither is currently in view.

We include this stream not because it's investable today, but because if it ever becomes investable, the early signal will come from places most quantum coverage doesn't track: federal procurement budgets, telecom infrastructure spend, consortia announcements.

Once the four streams are separate, every quantum news event sorts into one of them and the question becomes what does this say about that stream's trajectory, not "is this good or bad for quantum stocks." A breakthrough in error correction is mostly a story about the hardware-commercialization stream, not the PQC stream. A new NIST PQC standard accelerates the migration story but does nothing for hardware. A funding round for a quantum sensing company is a leading indicator for that stream's commercialization, separate from anything else.

Reading the sector this way produces fewer hot takes and more accurate ones. It also produces a portfolio of theses rather than a bet on a single horse, which is what the sector deserves at this stage and what the consensus framing (gestures around the room) isn't built to produce.

Three patterns this lens keeps surfacing as a result:

Coming up in this series: deeper posts on each of the four streams. The PQC migration exceptions are the natural starting point — there's a narrow case worth knowing about even though the broad trade is overstated.

For now: four streams, ordered by readiness. The important thing from here is staying disciplined about which is which.

Not investment advice. For informational purposes only.

Position disclosure: The author may hold positions in companies referenced.