Fig. 4
From: Complete elimination of information leakage in continuous-variable quantum communication channels
Scheme of the experimental implementation of the quantum communication protocol with zero information leakage. An ensemble of coherent states is prepared by adding white noise to an amplitude modulator. The ensemble is squeezed by injecting it into an OPO, which is pumped by light at λ/2. The resulting ensemble of squeezed coherent states is sent to the quantum channel, with transmissivity T. Bob measures the channel output using homodyne detection, using an LO from the same laser. Eve also uses homodyne detection with an LO from the same laser. AM: Amplitude Modulator, OPO: Optical Parametric Oscillator, LO: Local oscillator, T: Transmissivity of the quantum channel
