Quantum scrambling is the complete diffusion of information throughout a quantum system. The system is not just entangled, but it is entangled throughout all corners of the system. Scrambling is also thought to be the fate of information introduced into a black hole, and is a great example of the connection between quantum information and cosmology. But scrambling it is very difficult to measure, because the space of quantum states is exponentially large.
We didn’t create a black hole in the lab, but instead implemented a 7-qubit circuit on our universal quantum computer that for the first time shows the unambiguous detection of scrambling. The signature is a successful teleportation of information across the circuit.