Abstract
A multiparty quantum secret report scheme is proposed with quantumencryption. The boss Alice and her M agents first share asequence of (M+1)-particle Greenberger–Horne–Zeilinger (GHZ)states that only Alice knows which state each (M+1)-particlequantum system is in. Each agent exploits a controlled-not (CNot)gate to encrypt the travelling particle by using the particle inthe GHZ state as the control qubit. The boss Alice decrypts thetravelling particle with a CNot gate after performing a σxoperation on her particle in the GHZ state or not. After the GHZstates (the quantum key) are used up, the parties check whetherthere is a vicious eavesdropper, say Eve, monitoring the quantumline, by picking out some samples from the GHZ states shared andmeasuring them with two measuring bases. After confirming thesecurity of the quantum key, they use the remaining GHZ states repeatedly for the next round of quantum communication. This schemehas the advantage of high intrinsic efficiency for the qubitsand total efficiency.
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