Monitoring the intercept-resend attack with the weak measurement model

Unconditional security of the quantum key distribution protocol has been proved, but the practical quantum key distribution system may be attacked by utilizing imperfect state preparation and measurement devices. To improve security of the practical quantum key distribution system, we propose the weak measurement model to monitor the intercept-resend eavesdropping strategy in the quantum channel, where the detector-blinding attack and the wavelength attack can be observed through the quantum bit error rate value in the weak measurement model.