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The aim of this research is to improve quantum repeater performance such as amount of key rate and the quantum channel length. To do this, a 2.5 node quantum repeater scheme utilizing non-identical quantum memories in nodes instead of using same quantum memories in all nodes. The results indicated that, performance of the quantum repeater utilizing non-identical quantum memories is improved as compared to that of QR utilizing same QMs. Also, the results show that a 2.5 node quantum repeater using non-identical quantum memories with cut-off concepts has better performance than that of single node quantum repeater with same characteristics.