technologyScore 55/100Watch
Rigetti deploying niobium-tantalum superconducting contacts from Fermilab learnings to double coherence times, addressing primary fidelity bottleneck
“This includes joint IP with Fermilab where capping niobium superconducting contacts with tantalum has demonstrated meaningful coherence time improvements in fundamental experiments, and we are now incorporating those learnings into production chip designs.”
Why it matters
Coherence time is identified as the primary limiting factor for 2-qubit gate fidelity. Solving this via material science (tantalum capping) and process improvements (smoother Josephson junction interfaces) could unlock the scaling path to 1,000+ qubits with 99.9% 2-qubit fidelity, the critical milestone for quantum advantage.
Investment implication
Success in deploying these materials and process changes into production could validate Rigetti's chiplet architecture and accelerate its 3-year roadmap to quantum advantage, making it a credible competitor to IBM and Google. Investors should monitor quarterly technical progress metrics (coherence time, gate fidelity) on upcoming Cepheus-1-108Q deployments.