Fig. 1: MDI-QKD system experimental setup.
From: Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
LD laser diode, Circ circulator, VOA variable optical attenuator, BS beamsplitter, SPD single-photon detector. The inset illustration (top) shows the electrical signals applied to the lasers and the corresponding optical output for each basis/bit encoding.
