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The continuous-variable quantum key distribution with entanglement in themiddle, a semi-device-independent protocol, places the source at the untrustedthird party between Alice and Bob, and thus has the advantage of high levels ofsecurity with the purpose of eliminating the assumptions about the sourcedevice. However, previous works considered the collective-attack analysis,which inevitably assumes that the states of the source has an identical andindependently distributed (i.i.d) structure, and limits the application of theprotocol. To solve this problem, we modify the original protocol by exploitingan energy test to monitor the potential high energy attacks an adversary mayuse. Our analysis removes the assumptions of the light source and the modifiedprotocol can therefore be called source-device-independent protocol. Moreover,we analyze the security of the continuous-variable source-device-independentquantum key distribution protocol with a homodyne-homodyne structure againstgeneral coherent attacks by adapting a state-independent entropic uncertaintyrelation. The simulation results indicate that, in the universal composablesecurity framework, the protocol can still achieve high key rates againstcoherent attacks under the condition of achievable block lengths.

Continuous-variable source-device-independent quantum key distribution against general attacks