Rigetti Computing (RGTI) shares extended losses following second-quarter 2026 earnings that revealed deeper operating and net losses alongside modest revenue growth. The stock closed 1.49% lower at $16.53 and fell an additional 4.48% in after-hours trading to $15.79. Despite the sell-off, the company reported advances in qubit fidelity, a debt-free balance sheet with $541.3 million in cash, and a letter of intent with the U.S. Commerce Department that could yield up to $100 million in research funding.

Q2 Financial Results Show Rising Costs

Rigetti posted $5.1 million in revenue for the quarter ending June 30, 2026. Operating loss reached $28.1 million, while GAAP net loss totaled $52.6 million as development spending remained elevated.

Non-GAAP net loss came in at $16.0 million. GAAP loss per diluted share was $0.16, and adjusted loss per share was $0.05 for the same period. The results underscored the significant costs Rigetti continues to incur as it expands both its technology platform and commercial programs. Like other pure-play quantum hardware companies, Rigetti remains in a pre-profitability phase, with revenue levels reflecting an early-stage commercial market where customers are still evaluating adoption.

The company ended June with $541.3 million in cash and available-for-sale investments and no debt. That balance sheet position provides flexibility for continued research spending and customer deployments as Rigetti advances hardware performance and pursues larger system contracts.

Quantum Fidelity Improvements Across Systems

Rigetti reported measurable gains in qubit fidelity, coherence development, and gate speed. Its Cepheus-1-108Q system achieved approximately 99.9% median single-qubit gate fidelity, roughly 99.1% median two-qubit fidelity, and 60-nanosecond gate speeds.

Smaller platforms posted stronger two-qubit results. The 9-qubit system reached 99.8% median two-qubit gate fidelity, while the 36-qubit system achieved 99.6%, reinforcing the company's chiplet-based scaling strategy. The fidelity gap between smaller and larger systems reflects a widely recognized challenge in superconducting quantum computing, where increasing qubit counts tend to introduce more noise and crosstalk. Improving two-qubit fidelity at scale is a critical industry-wide milestone on the path toward fault-tolerant quantum computing, which requires error rates low enough to support practical error correction.

Rigetti continues to invest in chip design, fabrication methods, materials, and manufacturing processes aimed at extending coherence times and improving fidelity as system sizes grow. Enhanced coherence could also bolster reliability across research, cloud, and on-premises deployments.

Federal Funding Letter of Intent and Strategic Partnerships

Rigetti signed a letter of intent with the Commerce Department for a proposed three-year award of up to $100 million to support superconducting quantum computing research under the CHIPS Act. The agreement could grant the department an equity position tied to the funding amount. The proposed award aligns with broader U.S. government efforts under the CHIPS and Science Act to strengthen domestic quantum technology development as nations including China and members of the EU accelerate public investment in quantum capabilities.

The company also expanded its collaboration with Hewlett Packard Enterprise and the Pittsburgh Supercomputing Center. Rigetti will supply a 9-qubit Novera system for the new TangleLab testbed, a project supported by a National Science Foundation grant focused on hybrid quantum-classical computing research.

Beyond TangleLab, Rigetti continues fulfilling on-premises system orders for research and government clients. Its deployment pipeline includes additional Novera installations and a 108-qubit program for India's Centre for Development of Advanced Computing (C-DAC). Key milestones investors and industry watchers are monitoring include the conversion of the federal letter of intent into a definitive agreement, progress on the C-DAC 108-qubit deployment, and continued fidelity gains at larger system sizes.

Despite these technology and partnership advances, the after-hours stock decline indicated that quarterly losses weighed more heavily on investor sentiment than the company's scientific progress and funding prospects.