Quantum random number generator for chip structure homodyne detection

Abstract

The invention discloses a quantum random number generator for chip structure homodyne detection. The quantum random number generator is characterized in that a light source (1), a polarization controller (2), an input waveguide (3), a multimode interference device (4), an output waveguide (5), a photodiode (6), a trans-impedance amplifier (7), a multiplier (8), a low-pass filter (9), an analog-to-digital converter (10) and an extractor (11) are integrated on a chip; the light source (1) emits the continuous laser, the continuous laser is multiplied by a sinusoidal signal through the multiplier(8) and then is filtered through the low-pass filter (9) to obtain a signal of a required frequency band, the signal is converted through the analog-digital converter (10) to obtain a digital signal,and the digital signal is extracted through the extractor (11) to obtain a final random number QRN and output the final random number QRN. The input waveguide, the output waveguide, the multimode interference device and the photodiode device are integrated on the chip, so that the equipment can be miniaturized, the typical size of the equipment is less than 1cm * 1cm * 0.3 cm, and the output bandwidth is very large.

Description

technical field [0001] The invention belongs to the field of cryptography, and relates to the G07C random number generation or G06F7 / 58 random number or pseudo-random number generator technology classified by IPC, especially the quantum random number generator for chip structure homodyne detection. Background technique [0002] Homodyne detection means that the local oscillator signal used for detection is separated from the transmitting light source through the optical splitter, and mixed with the modulated receiving signal to generate a heterodyne signal. This detection method can save the local oscillator light source. Homodyne detection is widely used in quantum optics and some quantum random number generators. These devices are relatively large, which limits their application range. [0003] There are few related public documents. [0004] The Chinese patent application 201611015636.9 filed by Shanghai Langyan Optoelectronics Technology Co., Ltd. discloses a high-spee...

AI Technical Summary

Problems solved by technology

[0007] With the development of integrated quantum optics, in recent years, many devices used in quantum optics, including photodetectors, have integrated on-chip solutions, which makes devices that have requirements for applications to such devices have further development. possibility of miniaturization

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