  The quantum Zeno effect reveals that the continuous observation of a quantum
system can result in significant alterations to its evolution. Here, we present
a method for establishing polarization entanglement between two initially
unentangled photons in coupled waveguides via the quantum Zeno effect. We
support our analytical investigation with numerical simulations of the
underlying Schrodinger equation describing the system. Further, we extend our
technique to three coupled waveguides in a planar configuration and determine
the parameter regime required to generate three-qubit W-states. Our findings
offer a powerful quantum state engineering approach for photonic quantum
information technologies.
