فاطمه نادري

Quantum Key Distribution (QKD) stan‎ds as one of the most critical novel cryptographic technologies, relying on the laws of quantum mechanics to enable the unconditional secure transmission of a secret key between two remote parties. Despite this theoretical security, practical QKD implementations have always been vulnerable to side-channel attacks targeting the detectors. The Measurement-Device-Independent Quantum Key Distribution (MDI-QKD) protocol was introduced to address this specific vulnerability, guaranteeing the systemʹs security against all detector-based attacks. The main focus of this thesis is the calculation an‎d analysis of the final Secret Key Rate (SKR) in the MDI-QKD protocol under practical conditions. To achieve this, the mathematical model of the protocol was first introduced, an‎d the formula for the secret key rate was explicitly defined. Subsequently, using data from reference tables, calculations pertaining to the single-photon yield (y11 ) an‎d single-photon error rate ( e11) were performed, ultimately yielding the secret key rate value. The effect of finite key length was inherently accounted for in these formulas to ensure the results closely approximate real-world conditions. The results obtained demonstrate that the final secret key rate is equal to [ 6.6504×10^-8]. This value exhibits an acceptable consistency when compared to previous studies, indicating that the MDI-QKD protocol can maintain a stable an‎d reliable performance in operational conditions, despite inherent limitations an‎d noise.

توزيع كليد كوانتومي , شبيه‌سازي عددي , رمزنگاري كوانتومي

Quantum Key Distribution , MDI-QKD Protocol , Numerical SimulationQuantum Cryptography

Fatemeh Naderi

Dr. Mohammad Vahedi