  Multiparticle entangled quantum states, a key resource in quantum-enhanced
metrology and computing, are usually generated by coherent operations
exclusively. However, unusual forms of quantum dynamics can be obtained when
environment coupling is used as part of the state generation. In this work, we
used quantum Zeno dynamics (QZD), based on nondestructive measurement with an
optical microcavity, to deterministically generate different multiparticle
entangled states in an ensemble of 36 qubit atoms in less than 5 microseconds.
We characterized the resulting states by performing quantum tomography,
yielding a time-resolved account of the entanglement generation. In addition,
we studied the dependence of quantum states on measurement strength and
quantified the depth of entanglement. Our results show that QZD is a versatile
tool for fast and deterministic entanglement generation in quantum engineering
applications.
