Colloquium
Department of Physics, NCU
Frequency-correlated quantum key distribution with decoy-state method
Prof. Pin-Ju, Tsai (蔡秉儒)
Dept. of Physics, NCU
Date 2022.05.24 (Tue)
Place S4-625
Time 14:00-16:00
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Abstract :
In this talk, a novel and robust quantum key distribution protocol, called the decoy-state frequency-correlated QKD (DS-FCQKD), will be proposed. This protocol considers utilizing the frequency correlation of spontaneous parametric down-conversion (SPDC) photon-pairs to encode the information, its highly entangled nature has the potential to implement large-alphabet encoding and further increase the secure key rate (SKR). To ensure the protocol’s security, we consider installing a decoy-state channel for security checks. Our analysis shows even though Eve executes the intercept/resend (IR) attack with the optimal conditions, the decoy-state method will force Eve to send an error signal into the system which induces a considerable quantum-bit-error rate (QBER). By measuring the QBER, the attack from Eve will be detected by Alice and Bob, further maintaining the security. Since the frequency encoding of DS-FCQKD, effectively avoids the polarization mode dispersion (PMD) and phase fluctuation in optical fiber, moreover, not need interferometers. This simple setup can significantly reduce the complexity of the experimental system and has the huge potential to be implemented with realistic devices.