Defects Generate Structures Linked to Chaos in Quantum Systems Now

Generating unitary designs, mathematical tools for complex calculations in quantum physics, typically requires randomness or extensive system modification. A single local defect within an otherwise orderly quantum system can create these designs using a specific protocol called two-Pauli kicks with temporal sampling. Even a single disruption within an orderly quantum system generates behaviour usually associated with chaotic systems. Introducing controlled ‘defects’ breaks predictable patterns and creates useful properties called unitary k-designs using only minor disturbance. The team achieved…