  Entanglement is a unique quantum mechanical attribute and a fundamental
resource of quantum technologies. Entanglement can be achieved in various
individual degrees of freedom, nonetheless some systems are able to create
simultaneous entanglement in multiple degrees of freedom - hyper-entanglement.
A hyper-entangled state of light represents a valuable tool capable of reducing
the experimental requirements and resource overheads and it can improve the
success rate of quantum information protocols. Here, we report on demonstration
of polarization and time-bin hyper-entangled photons emitted from a single
quantum dot. We achieved this result by applying resonant and coherent
excitation on a quantum dot system with marginal fine structure splitting. Our
results yield fidelities to the maximally entangled state of 0.81(6) and
0.87(4) in polarization and time-bin, respectively.
