Cat qubits stay stable for over an hour in quantum computing record

French quantum computing startup Alice & Bob has set a new record in qubit stability by demonstrating that their Galvanic Cat qubits can resist bit-flip errors for over an hour, a significant improvement from the previous record of 430 seconds (about seven minutes) achieved in 2024. Bit-flip errors are one of the main challenges in quantum computing, and extending the bit-flip lifetime to this extent marks a crucial step toward practical fault-tolerant quantum machines. The breakthrough was realized through a combination of software optimizations, experimental techniques, and advanced engineering on their latest qubit design, which also powers their 12-qubit Helium 2 chip. This advancement not only surpasses typical cosmic ray impact timescales, suggesting enhanced qubit robustness, but also enables more efficient error-correcting codes that could reduce the hardware requirements for large-scale quantum computers by up to 200 times. Alice & Bob reported bit-flip times between 33 and 60 minutes at a