Full differential equalization random number generating method based on optical quantum four-quadrant detection

Abstract

The invention discloses a full differential equalization random number generating method based on optical quantum four-quadrant detection. A matched wavelength LED is adopted as a light source, two photo-current signals are extracted by a method of four quadrant detector diagonal pixel splice to achieve double path balance zero difference detection. Two symmetrical pre-operational amplifiers respectively amplify two current signals in full differential amplification to eliminate common-mode interference signals and eliminate classical optical noise of a low frequency segment and electrical noise produced during primary amplification. Quantum random number noise generated by processing conforms to gaussian distribution. A true random number sequence can be obtained by binarization of gaussian distribution. Integration level is high, signal quality is improved, and the product cost is lowered. The photo-current signals are subjected to IV conversion, inverse amplification and fully differential processing, and high frequency modulation and demodulation, FIR filtering, direct current elimination and distribution processing, a high-quality quantum random number sequence is generated. Devices such as a beam splitter mirror and optical fibre are omitted, and structure is simpler.

Description

technical field [0001] The invention relates to IPC classification G06F7 / 58 random number or pseudo-random number generator technology, belongs to the field of cryptography, in particular to a method for generating a fully differential balanced random number based on light quantum four-quadrant detection. Background technique [0002] The vacuum quantum random number refers to the use of the quantized uncertainty of the vacuum state fluctuation to collect, amplify and output it to generate a random data stream. The shot noise of the photodetector reflects the fluctuation of the light quantum, so in terms of technical realization, it can be realized by extracting the shot noise of the photodetector, amplifying, and identifying the output. [0003] The principle of balanced homodyne detection to extract shot noise usually divides a beam of light into two paths and incidents them on two identical photodetectors respectively, and then makes a difference between the two paths of ...

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Problems solved by technology

Even so, due to the charge leakage of the energy storage capacitor and the inconsistency of the discrete capacitor parameters, the collected laser pulse signal is distorted, which reduces the system accuracy

In addition, due to the large individual differences in the characteristics of discrete capacitor parameters changing with temperature, the laser pulse signal processing gains of the four channels are inconsistent, and the measurement accuracy of the spot center position is easily affected by the ambient temperature

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