Multiparty semiquantum key agreement without entanglement

Ming-Ming Wang,Rui-Fan Han,Lin-Ming Gong

Table 1. Qubits efficiencies of our SQKA protocols, where M is the number of classical players, N is the length of each player’s secret key, and τ is the length of the REFLECT qubits used for security detection.

Protocol 1 Protocol 2 Protocol 3 Key length: s N N N Qubits costs: q 32N 16N + 4τ $4{M}^{2}N+2M\tau $ Classical costs: c 22N 14N + 2τ $4{M}^{2}N-{MN}+M\tau $ Efficiency: η $\approx \tfrac{1}{54}$ $\approx \tfrac{N}{30N+6\tau }$ $\approx \tfrac{N}{8{M}^{2}N-{MN}+3M\tau }$