Quantum key distribution systems for secure communications
This master's thesis presents a comprehensive exploration of continuous-variable quantum key distribution (CV-QKD) simulations using the QOSST (Quantum Open Software for Secure Transmissions) framework. The work focuses on implementing and validating CV-QKD simulation capabilities, examining pa...
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| Tipo de documento: | dissertação |
| Data de publicação: | 2025 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/452521 |
| Acesso em linha: | https://hdl.handle.net/2117/452521 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Quantum communication Cryptography Computer simulation Quantum key distribution Continuous-variable QKD CV-QKD QOSST Quantum cryptography Quantum communications Secure communications Gaussian modulation Constellation design Simulation validation Parameter optimization Quantum information theory Holevo bound Finite-size analysis Comunicació quàntica Criptografia Simulació per ordinador Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia |
| Resumo: | This master's thesis presents a comprehensive exploration of continuous-variable quantum key distribution (CV-QKD) simulations using the QOSST (Quantum Open Software for Secure Transmissions) framework. The work focuses on implementing and validating CV-QKD simulation capabilities, examining parameter specifications and their effects on system performance. The investigation reveals critical parameter sensitivities in CV-QKD systems, including the discovery of constellation dimension thresholds where dimensions below 35 result in unphysical negative secret key rates. Through systematic parameter optimization, the study achieves 48-89% error reduction across different transmission distances when comparing simulation results with published experimental data. The research provides valuable insights into CV-QKD simulation validation challenges and establishes practical guidance for constellation design in quantum communication systems. Key findings include the identification of optimal QAM dimension requirements, parameter sensitivity mapping, and the complexities of bridging theoretical quantum security models with practical implementation realities. |
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