Fig. 3: Schematic of experimental configuration for SDI QRNG.
From: Semi-device-independent quantum random number generator with a broadband squeezed state of light
The whole space can be divided into an untrusted space and a private space. A broadband squeezed state is generated form the OPA, and detected with a BHD and the LO transmitted from the untrusted space. The check quadrature, electronic noise and the LO fluctuation are used to calibrate the conditional min-entropy. The data quadrature is used to generate raw random bits. Very few terminal random bits are injected into the locking box and chopper to determine the quadrature type and measure electronic noise respectively. EC electric cable, DC data cable, HR mirror with high reflectivity, BS 50/50 beam splitter, DBS dichroic beam splitter, OPA optical parametric amplifier, BHD balanced homodyne detector, BA broadband amplifier, LB locking box, OSC oscilloscope, EEB entropy extraction box, EB entropy estimation box, NSU noise source unit, EOM electro-optic modulator.
