Fig. 2: The proposed continuous-variable quantum key distribution protocol.
From: Finite-size security of continuous-variable quantum key distribution with digital signal processing
Alice generates a random bit a ∈ {0, 1} and sends a coherent state with amplitude \({(-1)}^{a}\sqrt{\mu }\). Bob chooses one of the three measurements based on the predetermined probability. In the signal round, Bob performs a homodyne measurement on the received optical pulse and obtains an outcome \(\hat{x}\). In the test round, Bob performs a heterodyne measurement on the received optical pulse and obtains an outcome \(\hat{\omega }\). In the trash round, he produces no outcome.
