Quantum-computing 2026 — the four named milestone thresholds that would rerank the pecking order

The question

What 2024-2026 quantum-computing commercial milestones (qubit-count, gate-fidelity, useful-algorithm-benchmark) would credibly dethrone the current IonQ/QBTS/RGTI/Quantinuum public-market pecking order in the next 18 months? Founder named quantum (NIST + DOE roadmap) as a candidate orthogonal thesis on 2026-05-12 — the goal here is identifying instrumentation analogous to Innermost-Loop semiconductor-sales anchors, so a quantum-layer thesis has disqualifying-conditions triggers.

What we already know (from the vault)

[[2026-03-11-ark-invest-quantum-computing-bitcoin]] — ARK + Unchained promotional white paper concludes today's quantum machines remain "far from threatening" Bitcoin cryptography. Sponsored framing flagged; useful as a directional confirmation that 2026 commercial quantum is not yet at cryptographically-relevant scale (CRQC).
[[2024-10-10-moonshots-ep123-jack-hidary-quantum-ai]] — Hidary frames quantum as "longer-term impact" — same year as Quantinuum's accelerated 2030 fault-tolerance roadmap, so the public-market pure-plays are still firmly in the trust-the-roadmap window vs. shipped-revenue window.
[[2026-04-20-3blue1brown-grovers-algorithm-clarification]] — clarifies Grover-quadratic-speedup misunderstandings: matters because the most-cited "quantum kills crypto" framing typically over-attributes to Grover, when the actual cryptographic threat sits with Shor on RSA/ECC and the post-quantum-cryptography (PQC) migration risk is the live operational concern.
The vault has no investing-build-thesis output for quantum yet — this is a green-field thesis target. [[investing-build-thesis]] skill is the right harness once milestone-instrumentation is named.

What the web says

Logical-qubit error-rate milestone (live in 2026): Quantinuum demonstrated 94 error-detected logical qubits on the Helios trapped-ion processor March 2026, with logical gate error rates of "roughly one in ten thousand operations" — first credibly "beyond break-even" demonstration (Quantum Insider, March 2026).
Two-qubit gate fidelity leaderboard (current): IonQ + Silicon Quantum Computing tied at 99.99% ("four nines"), Quantinuum at 99.97%, Rigetti Cepheus-1 (108 qubits, GA early 2026) at 99.5% (heygotrade quantum stocks 2026). The 99.99% threshold is the working barrier for fault-tolerant operations at scale.
Roadmap milestone (forward): Quantinuum claims accelerated path to universal fully fault-tolerant quantum computing by 2029-2030, supporting Microsoft's quantum-powered compute platform (Quantinuum roadmap blog).
Quantum-advantage benchmark (forward): IBM and others expect "first verified cases of quantum advantage by end of 2026" on real-world tasks (Zylos quantum 2026). This is the most disputable claim — "verified" and "real-world" are doing heavy lifting; historical pattern is that initial advantage claims get revised down once classical algorithms catch up.
NIST PQC mandate (anchor data): NIST mandates quantum-resistant algorithm implementation by May 2026 (FIPS 203 ML-KEM, FIPS 204 ML-DSA, FIPS 205 SLH-DSA already standardized August 2024); AWS/Cloudflare/Azure rolling out hybrid TLS 1.3 with PQC (NIST PQC migration 2026). This is the closest analog to "obligated dollars" in semiconductor sales — enterprise PQC migration is a hard date, not a roadmap promise.
AES-128 update: April 2026 cryptographer analysis found AES-128 likely safe from quantum attack — Grover gives only quadratic speedup, so a 256-bit-equivalent-against-quantum threshold reduces to 128-bit-against-classical (Quantum Insider AES analysis). Walks back some of the "harvest now decrypt later" panic timing.
IonQ specific: IonQ's 256-qubit demonstration planned for 2026 — execution-on-roadmap is the IonQ-specific milestone to watch (IonQ press).

Convergences and contradictions

Convergence: vault (ARK white paper) and web (AES-128 analysis, NIST PQC dates) agree that 2026 quantum is NOT yet at cryptographically-relevant scale — the disqualifying-condition for "quantum kills crypto" theses is far. PQC migration is the live commercial surface, not breaking crypto.
Convergence: Quantinuum and IonQ are both leading on fidelity, but on different metrics — Quantinuum leads on logical-qubit demonstrations, IonQ on two-qubit gate fidelity. Pure-play pecking order in public markets does not match the technical leaderboard cleanly.
Contradiction: "Quantum advantage by end of 2026" (IBM/Zylos framing) vs. Quantinuum's own 2029-2030 universal-fault-tolerant target. Both can be true if "advantage" means narrow-task superiority and "universal fault-tolerance" means general-purpose programmability — but the IBM framing reads as the more aggressive PR claim. Devil's advocate: treat any "first verified quantum advantage in 2026" announcement skeptically until peer-replicated.
Gap vs. vault expectation: vault assumed quantum-advantage-benchmark would be the primary anchor metric. Web evidence suggests NIST PQC migration adoption rate (% of Fortune-500 / cloud-provider deployments hitting May 2026 deadline) is the cleaner obligated-dollars anchor — closer to semiconductor-sales pattern than to roadmap-execution.

Synthesis for RDCO

The four threshold-events to instrument for a quantum-layer investing thesis (ordered by disqualifying power):

Logical-qubit count crossing 100 with error rate <1e-6 on a useful algorithm. Quantinuum is at 94 logical qubits / 1e-4 error rate as of March 2026. Crossing 100 LQ and dropping two more orders of magnitude on error rate is the working threshold for "approaching cryptographically-relevant scale." Trigger: track Quantinuum + IBM + Google announcements at AQIS / Q2B / APS March meeting cadence.
Two-qubit gate fidelity crossing five nines (99.999%) on a >100-qubit system. Currently four nines at smaller scale. Five nines at scale is the threshold that unlocks practical fault-tolerant universal computation per the surface-code error-budget literature. IonQ + Silicon Quantum Computing are the leaders to watch. Trigger: rerank pure-play pecking order if IonQ ships first; potentially reranks if a competitor jumps ahead.
First peer-replicated "quantum advantage" on an industry-relevant benchmark. NOT IBM's marketing claim — peer-replicated on something like drug discovery (Quantinuum + Microsoft chemistry simulation), portfolio optimization (D-Wave annealing benchmarks), or cryptanalysis (Shor on a non-trivial integer). Most likely venue: a 2026-Q4 / 2027-Q1 paper from a Quantinuum-Microsoft, IBM-Cleveland-Clinic, or IonQ-Hyundai partnership. Trigger: "quantum advantage" headline counts only if a second team reproduces within 6 months.
NIST PQC migration adoption hitting cloud-provider GA defaults. This is the obligated-dollars anchor analog. By the May 2026 NIST deadline, observe: do AWS / Azure / GCP make PQC the default for TLS 1.3 on free-tier accounts, or only opt-in? Default-on is the "real money is being spent" signal. Trigger: PQC migration rate is a tradeable proxy for the entire quantum-resistance enterprise spend wave (CrowdStrike, Cloudflare, Palo Alto Networks, etc., not the pure-plays).

Why this matters for RDCO specifically: the four pure-plays (IonQ, QBTS, RGTI, Quantinuum-via-Honeywell) are still in trust-the-roadmap territory — none have shipped meaningful revenue tied to quantum-specific deliverables. The investable instrumentation is bifurcated: (a) pure-play roadmap-execution bets (high variance, milestone 1 + 2 are the triggers), and (b) PQC migration adopters (lower variance, milestone 4 is the trigger, but much larger / more diluted exposure). RDCO's existing semiconductor-sales-anchor pattern transfers cleanest to (b), not (a). For (a), the analog is biotech-FDA-trial-readout: milestone-specific binary triggers, not continuous-anchor instrumentation.

Recommendation for the next /investing:build-thesis dispatch: target a "quantum-layer v1" thesis structured around milestone 4 (PQC migration via Cloudflare + cloud-provider TLS defaults), NOT the pure-plays. Save the pure-play thesis for when at least 2 of milestones 1-3 are within 12 months of trigger.

Open follow-ups

What's the actual percentage of AWS / Azure / GCP TLS connections that are PQC-enabled as of May 2026 vs. the NIST deadline? Public dashboards or analyst estimates?
Which beneficiary names (CrowdStrike, Cloudflare NET, Palo Alto Networks PANW, Thales TLS) capture the largest share of obligated PQC migration spend through 2026-2027?
Does Microsoft's "Quantum Supercomputer" partnership with Quantinuum convert into Azure-quantum revenue line-item disclosure in any 10-Q in 2026? That would be the first real Quantinuum-financial-flow anchor.
Is there a peer-reviewed taxonomy of "quantum advantage benchmarks" the way MLPerf catalogs ML benchmarks? If yes, that's the instrument-table source-of-truth. If no, it's an open gap — possibly an RDCO/Sanity-Check editorial opportunity.
IBM's 2026 quantum-advantage claim — what specific benchmark and what's the classical-algorithm-comparison baseline? Need primary-source IBM disclosure, not the marketing summary.

Sources

Vault:

[[2026-03-11-ark-invest-quantum-computing-bitcoin]]
[[2024-10-10-moonshots-ep123-jack-hidary-quantum-ai]]
[[2026-04-20-3blue1brown-grovers-algorithm-clarification]]
[[investing-build-thesis]] (skill, for the next dispatch)

Web: