Rigetti (RGTI) stock dips after 108‑qubit Cepheus reset; CEO cites “tunable coupler” complexity
Rigetti shares fell 2.1% to $24.72 Friday after the company delayed general availability of its 108-qubit Cepheus-1-108Q system to the end of Q1 2026. Vanguard disclosed a 10.89% stake in Rigetti in a recent regulatory filing. The 108-qubit system achieved a median two-qubit gate fidelity of 99%, according to the company.