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We propose an improved two-way continuous-variable quantum key distribution(CV QKD) protocol by adding proper random noise on the receiver's homodynedetection, the security of which is analysed against general collectiveattacks. The simulation result under the collective entangling cloner attackindicates that despite the correlation between two-way channels decreasing thesecret key rate relative to the uncorrelated channels slightly, the performanceof the two-way protocol is still far beyond that of the one-way protocols.Importantly, the added noise in detection is beneficial for the secret key rateand the tolerable excess noise of this two-way protocol. With the reasonablereconciliation efficiency of 90%, the two-way CV QKD with added noise allowsthe distribution of secret keys over 60 km fibre distance.

An improved two-way continuous-variable quantum key distribution protocol with added noise in homodyne detection