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<p>This article reports on the development of quantum communication technologies at IIT Madras, India, with a focus on the realisation of the Metro Area Quantum Access Network (MAQAN), India’s first multi-node quantum key distribution (QKD) network field-tested across Chennai. The MAQAN network exclusively integrates the Coherent One-Way (COW) and Differential Phase Shift (DPS) QKD protocols, demonstrating their robustness and compatibility with urban fibre infrastructure for secure key generation. In addition to the metro-scale network deployment, we present tabletop experimental results for phase-encoded BB84 implementations over fibre links of varying lengths and introduce new advances in Differential Phase Shift Measurement-Device-Independent QKD (DPS-MDI-QKD) with proof-of-principle demonstrations. The article analyses key challenges and proposed solutions for phase stabilisation, synchronisation, and secure key rate optimisation in real-world quantum communication environments. These results provide a solid foundation for the future integration of advanced QKD protocols into MAQAN and for the planned extension of interconnected quantum networks across multiple Indian cities as part of the QuILA (Quantum Internet with Local Access) initiative, aimed at establishing a robust quantum communication backbone for India.</p>

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Developing quantum networks: some key innovations

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Nilesh Sharma,
  • Saravana Vilashini,
  • Gopala Krishnan,
  • Anagha Gayathri,
  • Ashutosh Kumar Singh,
  • Vaibhav Pratap Singh,
  • Valliamai Ramanathan,
  • Prabha Mandayam,
  • Anil Prabhakar

摘要

This article reports on the development of quantum communication technologies at IIT Madras, India, with a focus on the realisation of the Metro Area Quantum Access Network (MAQAN), India’s first multi-node quantum key distribution (QKD) network field-tested across Chennai. The MAQAN network exclusively integrates the Coherent One-Way (COW) and Differential Phase Shift (DPS) QKD protocols, demonstrating their robustness and compatibility with urban fibre infrastructure for secure key generation. In addition to the metro-scale network deployment, we present tabletop experimental results for phase-encoded BB84 implementations over fibre links of varying lengths and introduce new advances in Differential Phase Shift Measurement-Device-Independent QKD (DPS-MDI-QKD) with proof-of-principle demonstrations. The article analyses key challenges and proposed solutions for phase stabilisation, synchronisation, and secure key rate optimisation in real-world quantum communication environments. These results provide a solid foundation for the future integration of advanced QKD protocols into MAQAN and for the planned extension of interconnected quantum networks across multiple Indian cities as part of the QuILA (Quantum Internet with Local Access) initiative, aimed at establishing a robust quantum communication backbone for India.