Full-Stack Silicon CMOS Quantum Computer by Quantum Motion: status and timeline

Milestones

Next · DARPA QBI Stage B completion (approx. 12-month phase)

Full-stack silicon CMOS system at UK NQCCSep 2025Complete.
DARPA QBI Stage B selectionNov 2025Complete.
Series C close at $160MMay 2026Complete.
DARPA QBI Stage B completion (approx. 12-month phase)Target Nov 2026Current milestone.
Scaled production-ready systemTarget 2027Not yet reached.
Next-generation larger-scale systemTarget 2028Not yet reached.

Most important updates

Quantum Motion selected for Stage B of DARPA's Quantum Benchmarking Initiative; one of 11 advancing from initial 18Nov 2025
Quantum Motion delivers first full-stack silicon CMOS quantum computer to UK National Quantum Computing CentreSep 2025

Upcoming

Nov 2026DARPA QBI Stage B completion (approx. 12-month phase)in about 3 weeks (next)
2027Scaled production-ready system
2028Next-generation larger-scale system

Current obstacles

Charge noiseUnpaired charges create fluctuating fields; requires careful fabrication.
1,000+ qubit scalingManaging control lines and readout at scale is an unsolved signal-integrity challenge.

Physics limits

Coherence time is millisecondsGates and measurements must complete much faster; limits circuit depth.
Local two-qubit gatesNearest-neighbor only; long-range gates via mediator qubits add circuit depth.

How it works

4 parts

Quantum dots

Electron spins trapped in silicon

Individual electrons confined in quantum dots; gate electrodes control energy levels.

Gates

RF/microwave field control

Nanosecond single-qubit and controlled-phase gates driven by resonant pulses.

Readout

Spin-dependent charge detection

Spin state modifies tunneling rates; sensors measure qubit state at >99.9% accuracy.

Integration

Co-packaged control electronics

Classical electronics alongside quantum chip minimize noise and simplify wiring.

Spec sheet

Spec	Full-Stack Silicon CMOS Quantum Computer
Unit cell deployed to NQCC	4 qubits^R (reported)
Single-qubit gate fidelity	>99%^R (reported)
Two-qubit gate fidelity	>99%^R (reported)
State preparation and measurement	>99.9%^R (reported)
Form factor	3 standard server racks^R (reported)
Power vs. cryo systems	1,000x lower^E (estimated)
Space vs. cryogenic systems	100x reduction^E (estimated)

^R reported by the company · ^E our estimate

Peer comparison

Silicon spin qubits peers

Spec	Full-Stack Silicon CMOS Quantum Computer	Diraq Equinix Sydney Deployment
Single-qubit gate fidelity	>99%^R (reported)	>99%^R (reported)
State preparation and measurement	>99.9%^R (reported)	>99.9%^R (reported)

^R reported by the company · ^E our estimate

Papers & demos

1 item

Oct 2024paper
300mm silicon spin qubits exceed 99% fidelity (opens arxiv.org)Industrial CMOS foundries achieve >99% gate fidelities, hitting error-correction thresholds.

Update log

2 updates

Nov 2025

Major: Quantum Motion selected for Stage B of DARPA's Quantum Benchmarking Initiative; one of 11 advancing from initial 18PressResearch

Sep 2025

Major: Quantum Motion delivers first full-stack silicon CMOS quantum computer to UK National Quantum Computing CentrePressHardware

About Quantum Motion

The team behind Full-Stack Silicon CMOS Quantum Computer

Quantum Motion

Silicon spin quantum processors, CMOS-based qubits

UK's best-funded quantum company. Silicon spin qubits fabricated in standard CMOS foundries. Deployed four-qubit system to UK NQCC (2025). $160M Series C (May 2026) positions for scale.

Deployed first full-stack silicon CMOS system to UK NQCC (Sept 2025); four-qubit unit cell on 300mm wafers.
DARPA QBI Stage B selected (Nov 2025); one of 11 advancing from 18; ~$15M funding for one year.
100x lower cost, 100x less space, 1,000x less power than cryogenic systems; path to millions of qubits.

quantummotion.tech (opens quantummotion.tech)Company profile →

Founded: 20179 yrs
Headquarters: United Kingdom
Status: Private
Valuation: private
Staff: ~120Jun 2026
Raised: $211M2 rounds
Last round: Series C · $160MMay 2026
Works in: QuantumSilicon spin qubits
Coverage: 1 program · 3 updateslatest 1 May 2026checked 10 Oct
Lead investors: DCVCKembara (Mundi Ventures)Bosch VenturesPorsche Automobil Holding
Customers: UK National Quantum Computing Centre (opens nqcc.ac.uk)
Partners: GlobalFoundries (opens globalfoundries.com)DARPA (Defense Advanced Research Projects Agency) (opens darpa.mil)University College London (opens ucl.ac.uk)University of Oxford (opens ox.ac.uk)
People: James Palles-Dimmock (opens quantummotion.tech)CEOJohn Morton (opens ucl.ac.uk)Co-founder & Chief Technology OfficerSimon Benjamin (opens ox.ac.uk)Co-founder & Chief Science Officer

Spec

Full-Stack Silicon CMOS Quantum Computer

Unit cell deployed to NQCC

4 qubits^R (reported)

Single-qubit gate fidelity

>99%^R (reported)

Two-qubit gate fidelity

>99%^R (reported)

State preparation and measurement

>99.9%^R (reported)

Form factor

3 standard server racks^R (reported)

Power vs. cryo systems

1,000x lower^E (estimated)

Space vs. cryogenic systems

100x reduction^E (estimated)

Spec

Full-Stack Silicon CMOS Quantum Computer

Diraq Equinix Sydney Deployment

Single-qubit gate fidelity

>99%^R (reported)

State preparation and measurement

>99.9%^R (reported)