Google Measures ‘Quantum Echoes’ on Willow Quantum Computer Chip

Google's researchers used their 105-qubit Willow quantum chip to measure "quantum echoes," studying how quantum information becomes scrambled and unscrambled over time through a complex protocol involving repeated reversals. This achievement required calculations so intensive that classical supercomputers would take three years compared to Willow's two hours, potentially advancing molecular chemistry simulations and black hole physics understanding.