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The schematic setup of vacuum shot noise based Gaussian distribution QRNG. Vacuum State: Vacuum shot noise (as random source); CW Laser: Continuous wave Laser (as local oscillator); VOA: Variable Optical Attenuator; BS: 50:50 Beam Splitter; PD1, PD2: Photodiode detectors (as balanced detector in homodyne detection); SUB: Subtractor; AMP: Amplifier; ADC: Analog-to-Digital Converter; EXT: Randomness Extractor.
