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More than 80 years passed since the first publication on entangled quantumstates. In this period of time the concept of spookily interacting quantumstates became an emerging field of science. After various experiments provingthe existence of such non-classical states, visionary ideas were put forward toexploit entanglement in quantum information science and technology. These novelconcepts have not yet come out of the experimental stage, mostly because of thelack of suitable, deterministic sources of entangled quantum states. Among manysystems under investigation, semiconductor quantum dots are particularlyappealing emitters of on-demand, single polarization-entangled photon-pairs.Although, it was originally believed that quantum dots must exhibit a limiteddegree of entanglement related to numerous decoherence effects present in thesolid-state. Recent studies invalidated the premise of unavoidable entanglementdegrading effects. We review the relevant experiments which have led to theseimportant discoveries and discuss the remaining challenges for the anticipatedquantum technologies.

Semiconductor quantum dots as an ideal source of polarization entangled photon pairs on-demand: a review