Charles Tahan has one of the most unique career arcs in quantum: PhD in silicon quantum computing, postdoc across three continents, fifteen years at the Lab for Physical Sciences running quantum programs and doing original research, then the first Director of the National Quantum Coordination Office at the White House OSTP, and now a Partner at Microsoft Quantum. He is one of the very few people who has both written U.S. quantum policy and is now executing on it from inside a major hardware program. That dual vantage point — policymaker turned builder — gives him a kind of credibility that is rare in a field full of either pure researchers or pure advocates. The timing of this conversation matters too. Microsoft just opened a 15,000-square-foot quantum research center at the University of Maryland's Discovery District, and DARPA has been given on-site access to the Majorana 2 system as part of its Quantum Benchmarking Initiative — the first opportunity for a technically capable independent party to evaluate Microsoft's topological qubit claims. Tahan is candid about the difficulty of what Microsoft is attempting, honest about the timelines, and enthusiastic about the parts of this problem that most people in his position would prefer to keep vague. Listeners who follow quantum hardware development, national science policy, or the workforce and ecosystem questions around quantum will find this episode unusually grounded. What We Get Into How Tahan ended up in government in the first place — starting as a DARPA technical consultant in 2007, helping write the milestones for the first quantum computing programs, and eventually becoming the first Director of the National Quantum Coordination Office What the NQI actually accomplished — and why Tahan argues its most important effect wasn't the money itself but the signal it sent globally, triggering coordinated national strategies across dozens of countries Why topological qubits are worth the difficulty — Tahan's honest case for why a high-risk, high-reward approach makes sense even when the engineering challenges are severe, and what the broader field has already gained from Microsoft's pursuit of Majorana physics The DARPA Quantum Benchmarking Initiative as an independent audit — why having DARPA's technical team on-site to evaluate Majorana 2 is meaningful, and how Tahan thinks about external validation as a feature rather than a threat Why Tahan now believes the next five years may equal the last thirty — his specific reasoning about how AI-accelerated science, the scale of capital flowing into computing infrastructure, and demonstrated quantum error correction have changed his sense of what's possible The "simplest quantum computer" argument — what Tahan was actually proposing in his 2024 arXiv preprint (written as a retrospective from 2040, presented at APS in a Doc Brown costume), and how the idea of using quantum computers to generate training data for classical models fits into a near-term business model What a quantum hardware makerspace actually is — the specific vision for the Maryland center's hands-on space, including dilution refrigerators, hardware from AMD, IQM, Quantum Motion, Fermilab's QICK tools, and a model Tahan hopes can be replicated and scaled Why the workforce gap is a hardware problem, not just a software one — and how Tahan's own path (his father was an HVAC technician at the Smithsonian who got him a high school internship in astrophysics) shapes his conviction that hands-on experience is how scientists and engineers are actually made Microsoft as a platform company — why Tahan frames Microsoft's quantum strategy as wanting the best computers for customers, full stop, which means partnering with and supporting other modalities, not just betting everything on topological qubits Resources & Links Guest Links Charles Tahan — Personal Site (tahan.com/charlie) — Papers archive, talks, and personal projects including Meqanic, a quantum iOS puzzle game designed to build intuition about quantum mechanics Charles Tahan — Wikipedia — Comprehensive career summary covering his PhD, government roles, and move to Microsoft Quantum UMD Physics — "Charles Tahan Brings His Research Expertise to Thriving UMD Quantum Enterprise" — UMD's announcement of Tahan's visiting research professor and special advisor roles Papers & Articles arXiv:2412.18726 — "Opinion: The Simplest Quantum Computer," Charles Tahan (Dec. 2024) — The speculative preprint written as a retrospective from 2040 that Tahan discusses in the episode; argues for a minimalist path to useful quantum computing and for using quantum computers to train classical models Microsoft Quantum Blog — "Microsoft's Quantum Research Center Opens in Maryland" (Sept. 22, 2026) — Written by Tahan; the primary source on the new center, DARPA access to Majorana 2, and the workforce development mission Microsoft on the Issues — "Supporting American Leadership in Quantum Technology" (May 7, 2025) — Tahan's written testimony to the House Committee on Science, Space, and Technology; covers NQIA reauthorization and AI-quantum convergence An in-depth look at Tahan's perspective in his Nature paper Quantum meets capitalism: how to pair long-term bets on technology with commercial speed IAS Science, Technology & Social Values Lab — "Dr. Charles Tahan" (Jan. 7, 2026) — Summary of Tahan's December 2025 IAS lecture "Quantum Information Technology and Society from 2000 to 2040," including his "not imminent, but inevitable" framing Science News — "Microsoft's Quantum Chip Got an Upgrade. Critics Are Still Skeptical" (June 2, 2026) — Covers expert skepticism around the Majorana 2 chip and the X vs. Z measurement debate; useful context for understanding what DARPA's independent evaluation is actually testing Post Quantum — "Microsoft Majorana 2: 20-Second Qubits, Same Questions" (June 3, 2026) — Critical analysis of the Majorana 2 chip, including the scientific controversy around missing X-parity measurements HPCwire — "Charles Tahan Exits National Quantum Coordination Office" (March 13, 2024) — Tahan's farewell Director's Letter; useful for understanding his transition from government to industry Organizations & Programs DARPA Quantum Benchmarking Initiative — The program under which DARPA is independently evaluating Microsoft's Majorana 2 system; program overview and stage structure
