Quantum Key Distribution with Single Qubit Transmission

Conventional Quantum Key Distribution (QKD) methods require too many qubit transmission between end points. As the capacity of quantum network is limited, it is important to develop more efficient methods. In this work, we propose a Multi-Qubit Greenberger-Horne-Zeilinger (GHZ) State-based QKD scheme that uses single qubit transmission and Quantum Nondemolition (QND) measurements to transmit multiple classical bits. We show that we can transfer N-1 classical bits by generating an N-qubit GHZ state and transmitting one of the GHZ qubits,