Abstract
Continuous-variable quantum key distribution (CVQKD) with the local local oscillator (LLO) is confronted with new security problems due to the reference pulses transmitted together with quantum signals over the insecure quantum channel. In this paper, we propose a method of phase attack on reference pulses of the LLO-CVQKD with time-multiplexing. Under this phase attack, the phase drifts of reference pulses are manipulated by eavesdroppers, and then the phase compensation error is increased. Consequently, the secret key rate is reduced due to the imperfect phase compensation for quantum signals. Based on the noise model of imperfect phase compensation, the practical security of LLO-CVQKD under phase attack is analyzed. The simulation results show that the practical security is reduced due to the phase attack, yet it is still tight when system parameters are estimated by training signals.
Highlights
Continuous-variable quantum key distribution (CVQKD) allows two remote participants to establish a common key through an insecure quantum channel [1]
We propose a method of phase attack on reference pulses of the local oscillator (LLO)-CVQKD with time-multiplexing
The simulation results show that the practical security is reduced due to the phase attack, yet it is still tight when system parameters are estimated by training signals
Summary
Continuous-variable quantum key distribution (CVQKD) allows two remote participants to establish a common key through an insecure quantum channel [1].
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