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<p>Quantum communication utilizes photonic qubits, encoded in properties like polarization and time-bin, to achieve secure and high-speed data transmission, leveraging their superior coherence times compared to other qubit types. Coherence time, governed by relaxation time (T1) and dephasing time (T2), plays a critical role in ensuring reliable communication over long distances. This study optimizes these parameters, achieving a coherence time of up to 0.995&#xa0;ms (ms) at a T2 of 10,000 femtoseconds (fs) and a T1 of 0.01&#xa0;fs, enabling a quantum communication length of approximately 100&#xa0;km. Simulations demonstrate that longer T2 significantly improves coherence time, stabilizing near 0.99&#xa0;ms, while higher T1 reduces coherence due to environmental effects. A quantum algorithm employing the Pauli-Z operator and error correction validates the critical balance between T1 and T2, with coherence sharply dropping for relaxation times exceeding 0.2&#xa0;fs. The results emphasize the direct proportionality between coherence time and communication length, with optimized photonic systems achieving communication over 150&#xa0;km in ideal conditions. This research provides valuable insights for advancing photonic technologies to enhance quantum communication efficiency. Finally, the study indicates that an optimized coherence time close to 0.99&#xa0;ms is better suited for quantum communication. This value is achieved with a dephasing time of around 20,000&#xa0;fs and a relaxation time below the critical threshold (approximately 0.2&#xa0;fs). Such a high coherence time ensures that the quantum states remain stable and robust over long distances, enabling secure and reliable quantum communication.</p>

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Architecting of quantum algorithim for ‘Z-gate optical qubit’ to realise efficient quantum communication system

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Gopinath Palai,
  • Pravin R. Kshirsagar,
  • Sivaneasan Bala Krishnan,
  • Prasun Chakrabarti,
  • Shrikant Vijayrao Sonekar,
  • Pradipta Mishra

摘要

Quantum communication utilizes photonic qubits, encoded in properties like polarization and time-bin, to achieve secure and high-speed data transmission, leveraging their superior coherence times compared to other qubit types. Coherence time, governed by relaxation time (T1) and dephasing time (T2), plays a critical role in ensuring reliable communication over long distances. This study optimizes these parameters, achieving a coherence time of up to 0.995 ms (ms) at a T2 of 10,000 femtoseconds (fs) and a T1 of 0.01 fs, enabling a quantum communication length of approximately 100 km. Simulations demonstrate that longer T2 significantly improves coherence time, stabilizing near 0.99 ms, while higher T1 reduces coherence due to environmental effects. A quantum algorithm employing the Pauli-Z operator and error correction validates the critical balance between T1 and T2, with coherence sharply dropping for relaxation times exceeding 0.2 fs. The results emphasize the direct proportionality between coherence time and communication length, with optimized photonic systems achieving communication over 150 km in ideal conditions. This research provides valuable insights for advancing photonic technologies to enhance quantum communication efficiency. Finally, the study indicates that an optimized coherence time close to 0.99 ms is better suited for quantum communication. This value is achieved with a dephasing time of around 20,000 fs and a relaxation time below the critical threshold (approximately 0.2 fs). Such a high coherence time ensures that the quantum states remain stable and robust over long distances, enabling secure and reliable quantum communication.