The secret, he found, was to stick the particle in a “disordered” quantum landscape, one dotted with peaks and valleys. Each location would have a random height, representing a random energy. In a real material, this disorder might come from impurities such as missing atoms or atoms of different elements.

Coroutine is a routine which can yield. Coroutines are typically scheduled cooperatively (=non-preemptively). Coroutines are similar to threads, although threads are typically scheduled preemptively (scheduler pre-empts=forces execution to pause and yield, even without yield in the language)