Fig. 1: A schematic diagram of a SI-QRNG. | npj Quantum Information

Fig. 1: A schematic diagram of a SI-QRNG.

From: Security analysis and improvement of source independent quantum random number generators with imperfect devices

Fig. 1

Eve controls the laser diode (LD) and sends pulses with states that are changed to mixed states through a filter and a phase randomizer (PR). Through a photon distribution monitor (PDM) which consists of a beam splitter (BS), an attenuator (ATT), a photodiode (PD) and a variable optical attenuator (VOA), the pulses are sent to an optical switch (OS) to choose the measurement basis-the X basis measurement (XBM) or Z basis measurement (ZBM)-both of which consist of a polarization beam splitter (PBS) and two single photon detectors (SPD). The PDM block is used for the distribution monitor and does not exist in general SI-QRNGs in the ref. 31.

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