  Entangled states are a crucial resource for quantum-based technologies such
as quantum computers and quantum communication systems (1,2). Exploring new
methods for entanglement generation is important for diversifying and
eventually improving current approaches. Here, we create entanglement in atomic
ions by applying laser fields to constrain the evolution to a restricted number
of states, in an approach that has become known as "quantum Zeno dynamics"
(3-5). With two trapped $^9\rm{Be}^+$ ions, we obtain Bell state fidelities up
to $0.990^{+2}_{-5}$, with three ions, a W-state (6) fidelity of
$0.910^{+4}_{-7}$ is obtained. Compared to other methods of producing
entanglement in trapped ions, this procedure is relatively insensitive to
certain imperfections such as fluctuations in laser intensity, laser frequency,
and ion-motion frequencies.
