Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz Communications
Abstract
The feasibility of cost-effective simultaneous quantum and classical communication (SQCC) transmitting both the quantum key and classical information via a superimposed coherent state is investigated both in optical and Terahertz (THz) bands. Since the existing THz SQCC schemes assume single-carrier (SC) transmission over flat fading channels, we embark on investigating SQCC in realistic frequency-selective multipath THz fading channels. We then propose an orthogonal frequency division multiplexing (OFDM) based SQCC system for time-invariant frequency-selective THz scenarios, supported by low-density parity-check coded (LDPC) multidimensional QKD reconciliation schemes. Our simulation results demonstrate that the OFDM-based SQCC scheme is capable of achieving a practical secret key rate (SKR) over a wide range of power sharing scenarios between the classical and quantum signals. By contrast its single-carrier counterpart requires the classical signal to be at least 100 times stronger than the quantum signal in THz SQCC.
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BibTeX
@misc{liu2026technical,
title = {{Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz Communications}},
author = {Xin Liu and Chao Xu and Soon Xin Ng and Mohammed El-Hajjar and Phuc V. Trinh and Shinya Sugiura and Lajos Hanzo},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.20542},
eprint = {2609.20542},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.20542},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz Communications
AU - Xin Liu
AU - Chao Xu
AU - Soon Xin Ng
AU - Mohammed El-Hajjar
AU - Phuc V. Trinh
AU - Shinya Sugiura
AU - Lajos Hanzo
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.20542
UR - https://arxiv.org/abs/2609.20542
AB - The feasibility of cost-effective simultaneous quantum and classical communication (SQCC) transmitting both the quantum key and classical information via a superimposed coherent state is investigated both in optical and Terahertz (THz) bands. Since the existing THz SQCC schemes assume single-carrier (SC) transmission over flat fading channels, we embark on investigating SQCC in realistic frequency-selective multipath THz fading channels. We then propose an orthogonal frequency division multiplexing (OFDM) based SQCC system for time-invariant frequency-selective THz scenarios, supported by low-density parity-check coded (LDPC) multidimensional QKD reconciliation schemes. Our simulation results demonstrate that the OFDM-based SQCC scheme is capable of achieving a practical secret key rate (SKR) over a wide range of power sharing scenarios between the classical and quantum signals. By contrast its single-carrier counterpart requires the classical signal to be at least 100 times stronger than the quantum signal in THz SQCC.
ER -