  We introduce the driven discrete time quantum walk, where walkers are added
during the walk instead of only at the beginning. This leads to interference in
walker number and very different dynamics when compared to the original quantum
walk. These dynamics have two regimes, which we illustrate using the
one-dimensional line. Then, we explore a search application which has certain
advantages over current search protocols, namely that it does not require a
complicated initial state nor a specific measurement time to observe the marked
state. Finally, we describe a potential experimental implementation using
existing technology.
