Quantum random number generator for source-independent high-dimensional time encoding

A quantum random number, source-independent high-dimensional technology, applied in the field of quantum communication, can solve the problem that the output rate is not very high, and achieve the effect of improving the output rate

Pending Publication Date: 2018-08-24
RUBAN QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output rate of the existing source-independent quantum random number generator is not very high. In order to further increase the rate, high-dimensional coding is a simple and reliable way

Method used

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  • Quantum random number generator for source-independent high-dimensional time encoding
  • Quantum random number generator for source-independent high-dimensional time encoding
  • Quantum random number generator for source-independent high-dimensional time encoding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] see image 3 , a source-independent high-dimensional time-coded quantum random number generator in this embodiment includes a sending module and a receiving module that match each other. The sending module includes phase preparation laser, pulse generating laser, fiber circulator and attenuator (ATT); the receiving module includes optical switch, X base vector measuring device, Z base vector measuring device and post-processing device (FPGA).

[0076] Taking encoding dimension 4 as an example, the working process of the quantum random number generator in this embodiment includes:

[0077] 1. The phase preparation laser generates long pulses and injects pulses into the fiber circulator to generate lasers;

[0078] Prepare the internal modulation method of the laser driving voltage by adjusting the phase (see below for details), and modulate the pulse group to a certain eigenstate |f of the X basis vector i >, the value is selected in advance, and each pulse group is mo...

Embodiment 2

[0097] see Figure 9 , in this embodiment, an unbalanced beam splitter (BS) is used for passive measurement; the transmittance and reflectivity of the BS are the same as the probability of the Z-based vector modulation and the X-based vector modulation; the BS divides the incident pulse component beam into two The transmitted pulse group enters the Z-based vector measuring device and the reflected pulse group enters the X-based vector measuring device. Due to the passive measurement, there is no need for additional random numbers to select the measurement device and the specific beam splitting ratio is given by parameter optimization. The rest of the devices and steps of this embodiment are the same as in Embodiment 1, so they will not be described in detail.

Embodiment 3

[0099] see Figure 10 , in the sending module of the present embodiment, the continuous laser light emitted by the laser is modulated by an intensity modulator (IM) to output a short pulse sequence; four consecutive short pulses in the pulse sequence form a pulse group, and the phase modulator (PM) will Each pulse group is modulated to a preselected eigenstate of an X basis vector. The remaining devices and steps of this embodiment are the same as those of Embodiment 1, so they will not be described in detail.

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Abstract

The invention discloses a quantum random number generator for source-independent high-dimensional time encoding. The generator comprises a sending module and a reception module which are matched mutually, wherein the sending module outputs an encoded optical pulse group in a high-dimensional time encoding manner; and the reception module receives the encoded optical pulse group for measurement ofX-basis vector and Z-basis vector respectively and then obtains the corresponding quantum random number through post-processing. According to the quantum random number generator for the source-independent high-dimensional time encoding, the output rate of the source-independent random number generator is improved in the high-dimensional encoding manner.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a quantum random number generator. Background technique [0002] As a resource, random numbers play an important role in many fields. Scientific simulation calculations, key systems, identity authentication, etc. are all inseparable from random numbers. Especially in security-related fields, randomness is the foundation of system security, and the use of true random numbers will significantly improve system security. Therefore, in any security-related application field, there is an urgent need for true random numbers. At the same time, in the emerging field of quantum communication, random numbers are also indispensable; in the quantum key distribution system, a large number of true random numbers are required. The birth of the quantum random number generator solves the problem of high-speed generation of true random numbers. A quantum random number generator is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F7/58
CPCG06F7/588
Inventor 富尧朱伟
Owner RUBAN QUANTUM TECH CO LTD
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