Abstract
This paper presents a mathematical framework for incorporating Structured Quantum Noise (SQN) into quantum-switched optical networks. SQN is represented as a link-level quantum operation, while Bell-state-measurement-based entanglement swapping is represented as a switching operation. Single-switch, two-switch, and general N -switch network architectures are derived explicitly. The resulting ordered-composition formulation shows that end-to-end network behavior depends on the sequence of structured link interactions and switching operations rather than solely on hop count or scalar attenuation. Network performance is characterized using fidelity, concurrence, negativity, and Quantum Fisher Information. The analysis predicts nonexponential fidelity scaling, switching-order sensitivity, and metric-dependent degradation, providing a mathematical foundation for analyzing structured environmental effects in quantumswitched optical networks. Keywords: structured quantum noise; quantum networking; quantum-switched optical networks; entanglement swapping; quantum repeaters; quantum internet; quantum fidelity; concurrence; negativity; quantum Fisher information
Research Context
This paper is part of CSA's quantum research program connecting quantum metrology, structured environmental noise, decoherence, quantum communication, and operationally relevant quantum-system engineering.
Citation
@misc{sidhu2026sqnquantumswitchedopticalnetworks,
author = {Deepinder Sidhu},
title = {Structured Quantum Noise in Quantum-Switched Optical Networks},
year = {2026},
note = {CyberSpace Analytics Quantum Research Series}
}