PsiQuantum

PsiQuantum is the stealth deep-tech startup that raised $700M—nearly twice the funding of #5 D-Wave Systems—to build a million-qubit fault-tolerant photonic quantum computer, targeting practical quantum advantage by 2029. By manufacturing chips through GlobalFoundries, it leverages standard semiconductor processes, reducing production costs by 60% compared to custom qubit fabrication methods. PsiQuantum bets that photonics is the only viable path to error correction, a bold claim that redefines the benchmark for scalability over competitors like Rigetti Computing.