Quantum Motion Raises $160M for Silicon Qubit Tech

Quantum Motion has successfully closed a $160 million Series C funding round, spearheaded by DCVC with participation from Kembara. This significant capital infusion underscores a strategic shift in the quantum computing sector, prioritizing scalable manufacturing processes rooted in established semiconductor fabrication techniques over purely theoretical advancements.

The company's core innovation lies in its silicon spin-qubit architecture, which leverages standard CMOS foundry processes. This approach allows for the creation of qubits with exceptional density, reportedly exceeding one million per square millimeter. This manufacturing synergy with the existing semiconductor industry, a sector representing hundreds of billions in capital investment and decades of process optimization, provides Quantum Motion with a substantial head start in its quest for commercially viable quantum systems.

Quantum Motion's architectural design deviates from conventional dense, 2D qubit arrays. Instead, it employs mobile qubits and shared control mechanisms within bilinear arrays. This enables qubits to be physically relocated for two-qubit operations, circumventing the need for complex long-range couplers and mitigating the wiring challenges that can limit the scalability of other quantum platforms. The system's design supports a projected 3,400 logical qubits per circuit with an impressive target logical error rate of 10⁻¹².

A critical differentiator is Quantum Motion's integration of cryo-CMOS control electronics directly alongside the qubits. Fabricated on GlobalFoundries' processes, these in-house designed chips minimize signal latency and improve fidelity by placing essential components like DACs and amplifiers at cryogenic stages close to the qubit plane. This integration is vital for managing the complexity of million-qubit systems and reducing the extensive cabling typically required.

The company's progress is validated by its advancement to Stage B of DARPA's Quantum Benchmarking Initiative, a rigorous evaluation of quantum hardware's path to commercial utility. Silicon spin qubits are increasingly represented in this program, signaling a broader industry recognition of manufacturability as a key enabler for fault-tolerant quantum computing. Quantum Motion previously delivered the world's first full-stack silicon CMOS quantum computer to the UK National Quantum Computing Centre in 2025, a system fitting within a data center footprint.

Proceeds from the Series C round will fuel Quantum Motion's progression from unit-cell demonstrators to more complex systems, targeting a 1,000-qubit looped-pipeline system to showcase fault tolerance. This funding supports the company's clear roadmap towards a one-million-data-qubit machine, positioning it at the forefront of the global industrialization push in advanced computing technologies.