  Modern quantum technologies in the fields of quantum computing, quantum
simulation and quantum metrology require the creation and control of large
ensembles of entangled particles. In ultracold ensembles of neutral atoms,
highly entangled states containing thousands of particles have been generated,
outnumbering any other physical system by orders of magnitude. The entanglement
generation relies on the fundamental particle-exchange symmetry in ensembles of
identical particles, which lacks the standard notion of entanglement between
clearly definable subsystems. Here we present the generation of entanglement
between two spatially separated clouds by splitting an ensemble of ultracold
identical particles. Since the clouds can be addressed individually, our
experiments open a path to exploit the available entangled states of
indistinguishable particles for quantum information applications.
