Welcome to the third issue of This Week in Quantum — a weekly digest of the most important news, research, and developments in the world of quantum computing.
This week will go down in history. Two independent studies published on March 30 have shaken our assumptions about how close we are to the moment quantum computers threaten today’s encryption. Meanwhile, the industry shows no signs of slowing down — new funding rounds, hardware breakthroughs, and billion-dollar government investments.
Industry News
Google and Oratomic drop “quantum bombshells” — a wake-up call for cybersecurity
On March 30, two landmark studies were published independently: a white paper from the Google Quantum AI team and a preprint from Oratomic, a Caltech spin-off. Both suggest that quantum computers capable of breaking current encryption systems could arrive before the end of this decade — far sooner than previously assumed. Google’s report indicates that breaking the elliptic curve cryptography (ECDSA-256) protecting Bitcoin and Ethereum could require fewer than 500,000 physical qubits — well below the millions cited in earlier estimates. Google has set 2029 as the deadline by which organizations should complete their migration to post-quantum cryptography (PQC). Cloudflare, which helps protect one quarter of the world’s internet traffic, said plainly: “It’s a real shock for us too.” Quantum computing researcher Scott Aaronson of UT Austin called both studies “quantum computing bombshells”. Neither paper has yet undergone peer review.
Read more → (Nature) | Read more → (Bloomberg)
Caltech/Oratomic: a useful quantum computer may need as few as 10,000 qubits
Researchers at Caltech and Oratomic have shown that a fully functional quantum computer could be built with as few as 10,000–20,000 qubits — not the millions previously assumed. The key is a new, far more efficient quantum error correction architecture based on neutral atoms. Manuel Endres and his team recently assembled the largest qubit array ever built, containing 6,100 trapped neutral atoms. The results suggest that a practically useful quantum computer could be within reach before the end of the decade.
IQM raises €50M from BlackRock and eyes public listing
Finnish quantum hardware company IQM has secured €50 million ($57.4M USD) in financing from BlackRock. The funding will accelerate development of full-stack superconducting quantum computers aimed at research institutions and HPC centers. IQM employs over 300 people across multiple continents and is preparing to go public through a merger with Real Asset Acquisition Corp.
Read more → (Quantum Computing Report)
UK government commits £2 billion to quantum sovereignty
The British government has announced a £2 billion ($2.67B USD) investment package aimed at making the UK a global quantum superpower by the 2030s. The package includes a world-first £1 billion procurement programme — direct government purchases of quantum computers from manufacturers, the first initiative of its kind anywhere in the world.
Read more → (Quantum Computing Report)
memQ closes $10M Series A for distributed quantum networking hardware
Startup memQ has raised $10 million in a Series A round to develop its Extensible Quantum Network Architecture (xQNA) — a hardware suite connecting separate quantum processing units over standard optical links. The architecture is designed to be qubit-agnostic and support so-called “blind” cloud computing. Atom Computing is among the hardware developers currently evaluating the technology.
Alice & Bob awarded $3.9M ARPA-E grant for quantum magnet design
Alice & Bob, together with Los Alamos National Laboratory and GE Vernova, has received a $3.9 million ARPA-E grant for a three-year project developing rare-earth-free permanent magnets using cat-qubit hardware and hybrid quantum-classical algorithms. The goal is a 10,000-fold speedup in material simulation compared to classical methods.
Research
QuiX Quantum and NASA demonstrate below-threshold error mitigation in photonic hardware
QuiX Quantum, in collaboration with NASA and the University of Twente, has demonstrated hardware-level below-threshold error mitigation on a photonic quantum computer. A photon distillation technique reduced photon indistinguishability errors by a factor of 2.2x, potentially cutting the hardware overhead for logical qubits by four times — opening a path to scaling photonic processors at significantly lower cost.
Read more → (Quantum Computing Report)
CavilinQ (Harvard + UChicago) raises $8.8M for modular quantum interconnects
CavilinQ has closed an $8.8 million seed round led by QVT to develop modular quantum interconnects based on cavity-enhanced photonic links. The technology aims to connect separate quantum processors into a single distributed system, bypassing the physical scaling limits of monolithic quantum architectures.
Hardware
QuEra releases open-source GPU-accelerated T-gate simulator
QuEra Computing has released Tsim — an open-source quantum circuit simulator optimized for NVIDIA GH200 hardware. It can process 85-qubit circuits at 600 nanoseconds per shot, enabling large-scale statistical analysis of universal quantum circuits. Tsim is compatible with the STIM format and integrated into the Bloqade ecosystem.
Qblox launches US manufacturing for quantum control systems
Qblox, in partnership with Prodrive Technologies, has opened a manufacturing and fulfillment hub in Canton, Massachusetts. Starting April 1, 2026, the company is shipping quantum control systems made in the USA — a direct response to supply-chain resilience requirements from the Department of Energy and US National Labs.
That’s all for this week!
See you next week. If you have a link worth including in the next issue — open a PR on GitHub or reach out directly.
This week was a turning point. The question is no longer whether quantum computers will reshape the rules of cryptography — it’s when. And the answer is becoming uncomfortably soon.