  Conventional Quantum Key Distribution (QKD) requires the transmission of
multiple qubits equivalent to the length of the key. As quantum networks are
still in their infancy thus, they are expected to have a limited capacity,
necessitating too many qubit transmissions for QKD might limit the effective
use of limited network bandwidth of quantum networks. To address this challenge
and enhance the practicality of QKD, we propose a Multi-Qubit Greenberger Horne
Zeilinger (GHZ) State-based QKD scheme that requires a small number of qubit
transmissions. The proposed method transmits one qubit between endpoints and
reuses it for the transmission of multiple classical bits with the help of
Quantum nondemolition (QND) measurements. We show that one can transfer L-1
classical bits by generating an L-qubit GHZ state and transferring one to the
remote party. We further show that the proposed QKD algorithm can be extended
to enable multi-party QKD. It can also support QKD between parties with minimal
quantum resources. As a result, the proposed scheme offers a quantum
network-efficient alternative QKD.
