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Quantum random number generator and method for uniformly and alternatively changing standard base

A quantum random number and generator technology, applied in the field of information security products, can solve problems such as difficulty in ensuring random sequence balance, difficulty in miniaturization of optical fibers, and correlation between front and rear signals

Inactive Publication Date: 2005-12-21
祝文军
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

First of all, they use multimode fiber for delay, which makes it difficult to ensure the balance of random sequences in the asymmetric design of the two parts of the optical path, and it is difficult to miniaturize such a long fiber
In addition, they use the method of delay coincidence to distinguish the signals of the two optical paths, which will limit the improvement of the sampling rate, because if the frequency is too high, it will cause correlation between the front and rear signals
[0019] The fourth plan is just a simple conceptual design

Method used

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  • Quantum random number generator and method for uniformly and alternatively changing standard base
  • Quantum random number generator and method for uniformly and alternatively changing standard base
  • Quantum random number generator and method for uniformly and alternatively changing standard base

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Embodiment Construction

[0037] The principle of our solution is as follows figure 1 As shown, a red pulse weak light (wavelength about 650nm) is generated by a diode laser (DL), and the pulse frequency is 10MHz. Because the distribution of Poisson photon numbers with a mean of 0.1 is a good approximation to the ideal δ distribution of single photons, we use an attenuator (Θ) to attenuate the pulsed light emitted by the LED to approximately 0.1 photons per pulse (or 10 pulses per photon). The attenuator (Θ) is composed of two polarizers, and the attenuation rate can be adjusted by adjusting the angle between their transmission directions (if the angle is 90 degrees, then no photons are transmitted). In this way, the photons emitted from the attenuator are linearly polarized. Without loss of generality, we assume that the angle between the polarization direction and the horizontal direction is θ, then the state of the photon can be expressed as:

[0038] |ψ>=cosθ|H>+sinθ|V>,

[0039] where |H> and |...

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Abstract

The invention relates to a quantum random number generator, belonging to information security products. It mainly includes a photon source composed of a diode laser (DL), an attenuator (Θ) placed behind the diode laser (DL), a spectroscopic device placed behind the attenuator (Θ) and an avalanche diode (D1 ), (D2) composed of single-photon detectors (A), (B) and peripheral circuits, characterized in that the spectroscopic device is a Fresnel combination prism (Φ). The method for the quantum random number generator to uniformly alternately transform the standard basis is: if the previous measurement agrees that the signal detected by the first detector (A) is 1, and the signal detected by the second detector (B) is 0; then A measurement agrees that the signal detected by the first detector (A) is 0, and the signal detected by the second detector (B) is 1.

Description

1. Technical field [0001] The invention belongs to information security products: security application and middleware products. 2. Background technology [0002] The present invention originates from the quantum cryptography communication which has caused extensive research upsurge in the world at present. The reason for saying this is mainly in two aspects: First, quantum cryptography communication requires truly random numbers, and this is very important. If the sequence of random numbers is compromised, quantum cryptography communication is extremely vulnerable. Therefore, several leading groups in the field of quantum cryptography communication in the world have developed their own quantum random number generator systems. 2. The technology used in the present invention is almost derived from quantum communication technology, such as single photon detection, utilization of photon state, etc. In addition, our uniform alternating transformation standard base processing o...

Claims

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Application Information

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IPC IPC(8): G06F7/58G06F12/14
CPCG06F7/588H04L9/0852
Inventor 祝文军王平晓
Owner 祝文军
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