Welcome back to This Week in Quantum — your weekly digest of the most important news from the world of quantum computing.
The week of June 7–14 followed hard on the heels of Quantinuum’s IPO and Microsoft’s Majorana 2 unveiling, and it didn’t slow down. Microsoft and Quantinuum published hard error-correction numbers in Nature, Pasqal put real hardware inside a European supercomputer, and Google publicly turned down federal quantum money on its own terms. Funding kept flowing, and quantum-safe networking took a real step out of the pilot phase. Let’s get into it.
Industry News
Microsoft and Quantinuum report up to 800x reduction in logical qubit error rates on trapped-ion hardware
On June 10, Microsoft and Quantinuum published results in Nature applying Microsoft’s error-correction architecture to Quantinuum’s trapped-ion hardware, reporting logical error-rate reductions ranging from 11x to 800x over physical baselines. The headline figures: an 800x improvement in logical Bell-state preparation, a 51x reduction per round of repeated error correction, and a 22x improvement in preparing a 12-qubit cat state.
The result lands just weeks after Microsoft unveiled Majorana 2 and days after Quantinuum’s Nasdaq debut, and it reframes the conversation from “whether error correction works” to “how far it can be pushed on today’s noisy-but-scalable hardware.” Impressive science — the timeline to fault-tolerant workloads remains an open question.
Pasqal switches on Italy’s first neutral-atom quantum computer inside the EuroHPC Leonardo supercomputer
Pasqal inaugurated “SOL,” Italy’s first neutral-atom quantum computer, at CINECA in Bologna — its third deployment in Europe. The 140-qubit Orion QPU is integrated directly into the EuroHPC Leonardo supercomputer, with classical HPC scheduling handling the hybrid quantum-classical workload rather than running the system as a standalone lab curiosity.
The project is co-funded by the EuroHPC Joint Undertaking and Italy’s Ministry of University and Research, and lands the same week Italy formally rolled out its National Quantum Strategy, backed by over €140 million from the National Recovery and Resilience Plan and two new national research centers.
Google explains why it passed on the White House’s $2 billion quantum initiative
Speaking at the Semafor Tech Summit in San Francisco on June 10, Google Quantum AI COO Charina Chou said Google chose not to join the Trump administration’s $2 billion quantum computing funding initiative, citing conditions attached to the funding that could have slowed the company’s own push toward a practical quantum computer. Chou added that Google continues to work with Washington through other channels and supports increased funding for basic quantum research.
The episode is a useful data point on how differently hardware vendors are weighing government capital against the strings attached to it — several other builders (Atom Computing, Diraq, D-Wave, Infleqtion, PsiQuantum, Quantinuum, Rigetti) accepted CHIPS-linked federal funding earlier this year.
Horizon Quantum picks Dublin for its second quantum computer testbed
Horizon Quantum announced Dublin as the location for its second quantum computing testbed, which will host a 256-qubit IonQ system as one of the most advanced commercial quantum systems in the world. The company cited Ireland’s growing quantum ecosystem, university network, and deep-tech talent pool as the deciding factors for the European headquarters deployment.
IQM upsizes PIPE financing to $146 million on Finnish pension-fund backing
IQM Quantum Computers and Real Asset Acquisition Corp. announced an upsized private-investment-in-public-equity round of over $146 million, driven largely by a new commitment from Ilmarinen, Finland’s largest earnings-related pension insurer. The capital is earmarked for IQM’s push toward fault-tolerant quantum computing.
Alice & Bob launches Helium, its first complete on-premise quantum computing system
Alice & Bob unveiled the Helium Quantum System, marking the company’s shift from selling cat-qubit chips to delivering a full quantum computing system for on-premise deployment. Helium encodes the company’s first logical qubit using as few as 18 cat qubits, with the processor architecture, cabling, control electronics, and software stack all engineered around error correction. The platform is designed to be upgradeable to support the next-generation 48 cat-qubit chip on Alice & Bob’s roadmap.
Colt and Ciena complete a quantum-safe transatlantic data trial
Colt Technology Services and Ciena completed a quantum-safe data transmission trial across nearly 6,900 km of subsea and terrestrial network between New York and London, protecting live data at an 800 Gb Ethernet service rate. The trial used Ciena’s WaveLogic 6 Extreme encryption with the newly NIST-standardized ML-KEM algorithm alongside Quantum Key Distribution interworking — a real-world test of defenses against the “harvest now, decrypt later” threat to long-lived subsea data.
Arkeon Technologies and Silicon Quantum Computing round out the funding week
Sweden’s Arkeon Technologies raised a €594,200 seed round led by Chalmers Ventures, Navigare Ventures, and Almi Invest to scale its post-fabrication method for tuning qubit frequencies on superconducting chips, with a pipeline of around 30 interested customers. Separately, Australia’s Silicon Quantum Computing received an additional 40 million AUD from the National Reconstruction Fund Corporation to expand quantum chip production, bringing the government’s total investment in the company to 60 million AUD.
Research Highlights
IBM open-sources ffsim, a fermionic quantum circuit simulation library
IBM released ffsim, an open-source Python library for accelerating and benchmarking fermionic quantum circuit simulations. Benchmarks show up to an 11x speedup over the FQE simulator and substantial memory savings, letting researchers prototype systems as large as a 64-qubit 2D Hubbard model without exhausting server memory — the gains come from exploiting symmetries such as total particle number and spin conservation.
University of Washington pairs AI and quantum computing to accelerate materials discovery
Materials scientists at the University of Washington combined AI and quantum computing to speed up the discovery and simulation of quantum materials. AI models handled large, many-layer stacks of molybdenum ditelluride, revealing quantum behaviors invisible at smaller scales, while quantum computers tackled harder-to-simulate phenomena such as Laughlin states — a division of labor the team argues could reshape how materials research is done going forward.
Xanadu sets a record for photonic chip edge-coupling loss
Xanadu announced an average edge-coupling loss of 0.085 dB per facet on its photonic chips — a critical packaging metric for the feasibility of photonic quantum computers, where light needs to move on and off chip with minimal loss to remain useful for computation.
IQM introduces “barbell” error-correcting codes for its Constellation architecture
IQM unveiled a new family of quantum low-density parity-check (QLDPC) codes, dubbed barbell codes, tailored to its Constellation processor topology, where each qubit natively connects to 12 others. The codes aim to preserve strong error-correction performance while keeping hardware complexity comparatively low — one of the more concrete architecture-specific answers yet to the QLDPC scalability question.
Upcoming Events
- IQT Nordics: Quantum Technology in a Changing World — June 22–24, 2026, Oslo, Norway
- Quantinuum, Origin Quantum & PQC roundup week — June 22, 2026 (industry news cycle)
- Quantum Machine Learning Conference 2026 — June 27, 2026 (online, Poland)
- Quantum Showcase and Congressional Engagement 2026 — June 30, 2026, Washington, D.C., USA
- IEEE qCCL 2026 — July 1–3, 2026, Aalborg, Denmark
- Helmholtz Quantum Konferenz — July 9–10, 2026, Berlin, Germany
- GRC Quantum Science 2026 — July 26–31, 2026, Easton, MA, USA