General theory for decoy-state quantum key distribution with arbitrary number of intensities

Abstract

We develop a general theory for quantum key distribution (QKD) in both the forward error correction and the reverse error correction cases when the QKD system is equipped with phase-randomized coherent light with arbitrary number of decoy intensities. For this purpose, generalizing Wang's expansion, we derive a convex expansion of the phase-randomized coherent state. We also numerically check that the asymptotic key generation rates are almost saturated when the number of decoy intensities is three.

This manuscript has been revised extensively

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Cited by in corpus (5)

• Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength-division multiplexing clock synchronization
• Upper bounds of eavesdropper's performances in finite-length code with decoy method
• General theory of decoy-state quantum cryptography with source errors
• Exact minimum and maximum of yield with a finite number of decoy light intensities
• Optimal ratio between phase basis and bit basis in QKD