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

A four-quadrant detection and optical quantum technology, which is applied in the field of cryptography, can solve the problems of reducing system accuracy, laser pulse signal distortion, and energy storage capacitor charge leakage, etc., to eliminate common-mode interference signals, eliminate individual differences, and eliminate signal distortion. Effect

Pending Publication Date: 2018-12-18
弦海(上海)量子科技有限公司
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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

Method used

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

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Embodiment 1

[0031] The specific implementation steps include:

[0032] as attached image 3 As shown, the four-quadrant photodetector includes four pixels A, B, C, and D that are uniformly distributed in a radial order, and the diagonal pixels AC and BD of the four-quadrant photodetector are parallel-connected respectively, so that When extracting two photocurrent signals, the requirement for consistency of the four pixels is reduced, and the uniformity of the output signal is improved when there is a slight deviation between the light source and the installation center point of the detector. The four-quadrant photodetectors are connected in parallel through diagonal pixels; the LED lamp emits light with a central wavelength of 870nm, which is coupled to the four-quadrant photodetectors, and the two quadrant photodetectors are connected in parallel to obtain two At this time, adjust the angle of the LED light to make the photocurrent of the two signals equal.

[0033] Two symmetrical pr...

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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 ...

Claims

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 夏从俊夏跃峰李在光
Owner 弦海(上海)量子科技有限公司
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