The Quantum Control Stack with Niels Bultink

Why This Episode MattersNiels Bultink earned his PhD at QuTech under Leonardo DiCarlo, where he performed some of the first real-time feedback experiments on solid-state qubits — the foundational primitive behind quantum error correction. He spun Qblox out of TU Delft in 2018, and has grown it to roughly 140 people serving 150+ customers worldwide, mostly on revenue rather than venture capital, before raising a $26M Series A in 2024.This conversation matters now because the goalposts for useful quantum computing have moved closer in the last 12 months. Recent estimates suggest breaking RSA may need ~10,000–100,000 qubits, not tens of millions — and at that scale, the control stack is no longer a lab afterthought. It is a strategic supply chain question, which is why the DOE just picked Qblox to manufacture Fermilab's QICK platform domestically. If you care about how quantum computers actually get built — the layer between the qubit and the software — this is the episode for you.SponsorThis episode is brought to you by Outshift, Cisco's incubation engine. The need for computational power is rapidly increasing in every sector. From drug discovery to material innovation to complex financial modeling, classical systems are reaching their absolute limits. It’s time for a paradigm shift. The answer is a scalable quantum network, built on open standards and vendor-agnostic architecture. By uniting distributed quantum devices, you unlock limitless computational power.Learn more about the Cisco Universal Quantum Switch at Outshift.com.Go deeper with the blog post.What We Get IntoWhy the IBM Quantum Experience originally needed a meter of rack equipment per qubit, and what had to change architecturally to scale past thatHow a quantum control stack can be genuinely qubit-agnostic — and where modality differences actually live (mostly in the analog front end, not the digital core)Why pre-compiled pulse sequences hit a wall, and how dynamic, adaptive control is a prerequisite for fault tolerance, not a nice-to-haveThe role of Qblox's SYNQ and LINQ protocols in achieving picosecond-level synchronization and low-latency feedback across hundreds of coresWhy FPGAs are the right substrate today, and why the field will need to move toward ASICs as production volumes growThe strategic logic behind manufacturing Fermilab's open-source QICK platform — and how it complements rather than cannibalizes the Qblox ClusterWhat the Quantum Utility Block partnership with QuantWare and Q-CTRL actually delivers, including a full-stack demo built in a weekend at APS March MeetingWhy Qblox opened a Boston HQ and started U.S. manufacturing in Canton, Massachusetts in 2026, and how geopolitics is reshaping quantum supply chainsNiels's read on which qubit modalities are gaining ground fastest right now — including a notable jump in spin qubits and neutral atomsWhat's special about the Dutch quantum ecosystem, and why a value-chain culture produced multiple revenue-driven hardware companiesResources &amp; LinksGuest &amp; CompanyQblox — Delft-based control stack company at the center of this episodeNiels Bultink on Google Scholar — Niels's research record from his QuTech years, useful background on his feedback control workQblox North America HQ announcement — Context for the Boston expansion discussed in the episodeQblox "Made in America" manufacturing announcement — Background on the Canton, MA manufacturing milestonePartnerships Discussed<a href="https://news.fnal.gov/2025/11/energy-department-announces-partnership-with-fermilab-and-qblox-to-manufacture-foundational-quantum-control-platform-for-u-s-research-and-innovation/"