Ghost vortices represent a unique class of topological excitations in quantum fluids, and are notoriously difficult to investigate because they are located in regions where superfluid density is low. In this work, we introduce a controlled platform for generating and observing these elusive vortices. By inducing rotation in an imbalanced mixture of two-component Bose-Einstein condensates (BECs), we create necklaces of real vortices in the majority component, with cores populated by particles from the minority component. The wavefunction associated to the state of the latter is characterized by the presence of ghost vortices. These ghost vortices exhibit an arrangement mirroring their real counterparts, forming a "dual" ghostvortex necklace, and play a crucial role in sustaining the overall dynamics of the mixture. Additionally, we propose an experimental approach for directly observing ghost vortices in an ultracold mixture of 23Na + 39K. Through a controlled quenching of the inter-component scattering length, expelled atoms from vortex cores diffuse and swirl around unpopulated phase singularities, enabling their direct observation.
