  Initialization of composite quantum systems into highly entangled states is
usually a must to allow their use for quantum technologies. However, the
presence of unavoidable noise in the preparation stage makes the system state
mixed, thus limiting the possibility of achieving this goal. Here we address
this problem in the context of identical particle systems. We define the
entanglement of formation for an arbitrary state of two identical qubits within
the operational framework of spatially localized operations and classical
communication (sLOCC). We then introduce an entropic measure of spatial
indistinguishability under sLOCC as an information resource. We show that
spatial indistinguishability, even partial, may shield entanglement from noise,
guaranteeing Bell inequality violations. These results prove the fundamental
role of particle identity as a control for efficient noise-protected
entanglement generation.
