Quantum Random Number Generation Using Merged Detection

Solution Overview

Problem

Conventional quantum random number generation devices require a large configuration for the detection stage due to the arrangement of multiple photon detectors, which increases size and complexity.

Innovation Solution

A quantum random number generation device that uses a particle generator to produce neutral particle beams, which are then rectified and spin-polarized by magnetic fields, allowing detection by a single particle detector with two regions, and a magnetic field controller to adjust the magnetic field directions based on the probability of detected particles to generate random numbers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple photon detectors are arranged following the polarization beam splitter to detect photons in different polarization states, then random number generation function is achieved, but the detection stage configuration becomes large and complex

Engineering Contradiction:

Improverandom number generation functionVSAvoiddetection stage configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple detection functions into a single particle detector by using a position-sensitive detection mechanism. The detector has multiple detection regions corresponding to different polarization states, allowing simultaneous detection of photons in vertically and horizontally polarized states within one integrated device, thereby reducing the number of separate detectors needed

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention introduces a spatial dimension to the detection process by using a position-sensitive detector that can distinguish photon arrival positions. Different detection regions in the same detector plane correspond to different polarization states, transforming the need for multiple separate detectors into a single detector with spatially differentiated detection zones

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If multiple photon detectors are arranged following the polarization beam splitter to detect photons in different polarization states, then random number generation function is achieved, but the detection stage size increases

Engineering Contradiction:

Improverandom number generation functionVSAvoiddetection stage size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines multiple detection functions into a single particle detector by using a position-sensitive detection mechanism. The detector has multiple detection regions corresponding to different polarization states, allowing simultaneous detection of photons in vertically and horizontally polarized states within one integrated device, thereby reducing the number of separate detectors needed

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single particle detector is designed to perform multiple detection functions simultaneously. It can detect photons in different polarization states, different spatial positions, and provide timing information, making one detector replace what would traditionally require multiple specialized detectors

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration reduces the size and cost of the detection stage while allowing for flexible control of probability distributions in the generated random number sequence, achieving a more compact and efficient random number generation system.

Implementation Method 1

a first magnetic field applicator to convert the rectified particle beam into two first particle beams that are spin-polarized in directions parallel and anti-parallel to a first magnetic field application direction

Methodology Applied

Scientific EffectSpin-polarization: Magnetism

Implementation Method 2

a second magnetic field applicator to convert one of the two outputted first particle beams into two second particle beams that are spin-polarized in directions parallel and anti-parallel to a second magnetic field application direction

Methodology Applied

Scientific EffectSpin-polarization: Magnetism

Implementation Method 3

a particle detector having two regions each of which detects particles in one of the two outputted second particle beams

Methodology Applied

Scientific EffectParticle detection: Photoelectric Effect

Data Source

PatentUS20250013434A1Quantum random number generation device

Publication Date: 2025.01.09 MITSUBISHI ELECTRIC CORP

AI summary

A quantum random number generation device includes: a particle generator to generate particle beams of neutral particles; a slit body to rectify the generated particle beams in a single direction; a first magnetic field applicator to convert the rectified particle beam into two first particle beams, and output the converted two first particle beams; a second magnetic field applicator to convert one of the two outputted first particle beams into two second particle beams, and output the converted two second particle beams; a particle detector to detect particles of the two outputted second particle beams; a random number generator to generate a random number using numbers of the detected particles; and a magnetic field direction controller to control the first or second magnetic field application direction based on probabilities of occurrence of the generated random number.