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The authors propose a multi-party quantum key distribution protocol which enables all the receivers can convert their respective private shared key into common secret key without use of entanglement. The main component of the protocol is a simple post quantum scheme for achieving the higher secret key rate. Efficiency of the extracted key rate is almost 100%. They assume that sender established the pre-shared private secret keys and a common secret number with the receivers. Their proposed scheme sends n strings of number to n receivers in the public channel to convert their respective shared secret key into common secret key in the presence of Eve.
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