Alice & Bob is pursuing a useful, fault-tolerant quantum computer by betting on a distinctive hardware approach: the cat qubit. Named after Schrödinger's cat, this superconducting qubit design suppresses one of the two dominant types of quantum errors at the hardware level, dramatically reducing the overhead normally required for quantum error correction and offering a potentially faster path to large-scale, reliable machines.
The company's roadmap centers on Helium, an error-corrected quantum system aimed at high-performance computing applications. By engineering error resilience directly into the qubit, Alice & Bob argues it can reach practical, fault-tolerant computation with far fewer physical qubits than competing architectures.
Founded in 2020 and headquartered in Paris, France, Alice & Bob was co-founded by CEO Théau Peronnin and Raphaël Lescanne, both trained quantum physicists. The company has built a quantum lab in Paris with a nanofabrication cleanroom for prototyping cat-qubit chips, and former Atos CEO Élie Girard joined its leadership.
In January 2025, Alice & Bob closed a €100 million (approximately $108 million) Series B led by Future French Champions, AXA Venture Partners, and Bpifrance, bringing total funding to around €130 million. The company was also selected for France's PROQCIMA national quantum program.
Alice & Bob positions cat qubits as a shortcut to fault tolerance, focusing its resources on a single, error-resilient qubit technology rather than spreading across multiple approaches.