  Quantum measurements play a fundamental role in quantum mechanics and quantum
information processing, but it is not easy to implement generalized
measurements, the most powerful measurements allowed by quantum mechanics. Here
we propose a simple recipe for implementing generalized measurements on a qudit
via quantum walks. With this recipe, any discrete quantum measurement can be
implemented via a one-dimensional discrete quantum walk; the number of steps is
only two times the number of measurement outcomes. As an illustration, we
present a unified solution for implementing arbitrary symmetric informationally
complete measurements in dimension 3.
