QUANTUM RANDOM NUMBER GENERATOR AND KEY GENERATION SYSTEM

A quantum random number generator and a key generation system, relating to the field of quantum communication and information security. The quantum random number generator comprises: a laser generation module (10), a first beam splitter (20), a detector (30), and a processing module (40); wherein the laser generation module (10) can emit a first laser beam and a second laser beam to the first beam splitter (20), and can adjust power of at least one laser beam of the first laser beam and the second laser beam, so that an average value of a detection result output by the detector (30) is close to 0. Hence, an influence of light-splitting ratio deviation of the first beam splitter (20) on the detection result output by the detector (30) can be avoided; and the reliability of the detection result is ensured, so that the processing module (40) can directly generate a random number on the basis of the detection result, and does not need to first perform processing on a direct current bias in the detection result, t