Table of contents

Overview

This project proposes a GHZ-state–based Quantum Key Distribution (QKD) scheme that significantly reduces qubit transmission overhead.
By generating an N-qubit GHZ state and transmitting only one qubit, the protocol enables the secure transfer of multiple classical key bits.

The approach combines quantum teleportation and quantum nondemolition (QND) measurements, making it well-suited for capacity-limited quantum networks.

Key Contributions

  • Single-qubit transmission: Sends one qubit per key bit instead of one qubit per bit per protocol round
  • GHZ-based encoding: Transfers up to N-1 classical bits using an N-qubit GHZ state
  • High efficiency: Achieves high efficiency outperforming BB84, E91, and related schemes

Protocol Concept

GHZ-based QKD protocol

Alice generates a multi-qubit GHZ state, transmits one qubit to Bob, and encodes key bits using teleportation and QND measurements.

Results

  • Successfully simulated GHZ-based QKD using NetSquid
  • Demonstrated higher key-to-qubit efficiency than classical QKD protocols
  • Feasible with experimentally demonstrated large-scale GHZ states

Publication

Tasdiqul Islam, Engin Arslan
Quantum Key Distribution with Single Qubit Transmission (Poster) IEEE QCNC 2024

BibTeX:

@inproceedings{islam2024quantum,
  title={Quantum Key Distribution with Single Qubit Transmission},
  author={Islam, Tasdiqul and Arslan, Engin},
  booktitle={2024 International Conference on Quantum Communications, Networking, and Computing (QCNC)},
  pages={357--358},
  year={2024},
  organization={IEEE}
}