Quantum Computing Advances — State of the Field 2025–2026

Narrative

The dominant story from VC and analyst coverage in 2025–2026 is a field in genuine transition, but with a wide and contested gap between technical milestones and commercial readiness. McKinsey's fourth annual Quantum Technology Monitor (June 2025) set the headline framing: the three pillars of quantum technology (computing, communication, sensing) could generate up to $97 billion by 2035, with quantum computing alone reaching $28–72 billion — and McKinsey declares 2025 the first year it sees 'a shift from development to deployment.' Bain's 2025 Technology Report concurs on the gradual adoption curve thesis, estimating an initial $5–15B market by 2035 from early simulation and optimization applications, against a $250B long-run upside — but adds a sobering data point: only 9% of tech leaders have a post-quantum cryptography roadmap in place despite 73% anticipating material quantum cyber risk within five years. Forrester's 2026 State of Quantum Computing report marks a significant upward revision, concluding that practical quantum utility and Q-day (the date a quantum computer can break RSA-2048) are both plausible by 2030 — citing Quantinuum's logical qubits achieving 22× lower failure rates and a milestone demonstrating 1,399 logical qubits could factor RSA-2028 in under a week. This contrasts sharply with Forrester's January 2025 report, which warned of a 'quantum investment winter' driven by AI distraction and cited Nvidia CEO Jensen Huang's pessimistic 15–30 year timeline as triggering double-digit stock declines in pure-play quantum names. Gartner's 2025 Hype Cycle for Deep Technologies places quantum computing back at the Peak of Inflated Expectations, calling widespread business impact at least three years premature and introducing quantum-as-a-service (QCaaS) as the preferred enterprise on-ramp. The QED-C's April 2026 State of the Global Quantum Industry report provides the most current hard numbers: the 2025 global quantum market reached $1.9 billion, private VC investment hit $4.9 billion (more than doubling 2024's record), and the sector's workforce grew 14% — with the market projected to double to over $4 billion by 2028. A16z's December 2025 research contribution takes a distinctly contrarian tone on the crypto-risk narrative, with research partner Justin Thaler arguing that timelines for cryptographically relevant quantum computers are widely overstated and that implementation bugs pose greater near-term risks than any quantum adversary.

On the hardware milestone front, Google's Willow chip (announced December 2024, elaborated through 2025) and the Quantum Echoes algorithm (October 2025) generated the most analyst attention — demonstrating the first 'verifiable quantum advantage' with a 13,000× speedup over classical supercomputers on a physics simulation task, and achieving 99.97% single-qubit gate fidelity. Microsoft's Majorana 1 topological qubit chip (February 2025) was the other defining announcement, with Microsoft claiming a path to one million qubits on a single chip 'in years, not decades' — but the claim was immediately contested by independent physicists, with the American Physical Society noting the accompanying Nature paper did not constitute evidence for Majorana zero modes, and subsequent Australian research identifying a fundamental decoherence mechanism. Woodside Capital Partners and SpinQ both frame 2025 as the year quantum tips from theory to industry, with the first documented case of real-world quantum advantage — IonQ and Ansys achieving a 12% outperformance over classical HPC in a medical device simulation — serving as a bellwether. The market-sizing landscape shows meaningful dispersion: BCC Research's conservative estimate ($1.6B to $7.3B by 2030 at 34.6% CAGR) sits well below MarketsandMarkets' ($3.52B to $20.2B at 41.8%) and SpinQ/others' most aggressive projections, reflecting genuine uncertainty about the pace of fault-tolerance milestones.