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We present a model that describes states of photon pairs,which have been generated by biexciton-cascade decays of self-assembled quantum dots,use of which yields findings that agree well with experimental result.Furthermore,we calculate the concurrence and determine the temperature behavior assoeiated with so-called entanglement sudden death that prevents quantum dots emitting entangled photon pairsat raised temperatures.The relationship between the fine structure splitting and the sudden death temperature is also provided.