Single-Photon Detector Array for High-Speed Random Number Generation
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Solution Overview
Problem
Existing quantum random number generators using single-photon detectors have limited bit generation speed due to detection efficiency and bias issues, resulting in lower random number generation rates.
Innovation Solution
A random number generating apparatus employing a light source with symmetrical light intensity distribution and multiple single-photon detectors arranged at equal radial distances, where each detector generates bits based on photon detection, and post-processing is applied to enhance randomness, including exclusive-OR operations to eliminate bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-photon detector is used to generate random bits, then true randomness is achieved, but the bit generation speed is limited due to detection efficiency constraints
Solution Approach 1:
The system divides the detection task across multiple single-photon detectors arranged in a circular array, with each detector handling a specific angular sector. This segmentation allows parallel bit generation from multiple detectors simultaneously, increasing overall bit generation speed while maintaining the true randomness provided by individual photon detection events
Solution Approach 2:
The invention transitions from a single-detector linear approach to a multi-detector circular array configuration, adding spatial dimensionality to the detection system. This dimensional change enables simultaneous detection events from multiple detectors, thereby increasing bit generation throughput while preserving quantum randomness
2Productivity
If multiple single-photon detectors are used to increase bit generation speed, then productivity improves, but bias issues arise due to unequal detection probabilities
Solution Approach 1:
The system positions each single-photon detector at an equal radial distance from the light source, ensuring that each detector experiences identical local conditions and detection probability. This local quality uniformity eliminates bias in bit generation while maintaining high-speed parallel detection across multiple detectors
Solution Approach 2:
The circular array configuration ensures that all detectors are equidistant from the isotropic light source, creating equipotential detection conditions. This geometric arrangement guarantees equal photon detection probability for all detectors, eliminating systematic bias and ensuring accurate random bit generation while maintaining high productivity
3Device complexity
If detectors are arranged asymmetrically to simplify configuration, then device complexity is reduced, but detection bias increases due to unequal photon detection probabilities
Solution Approach 1:
The invention employs a symmetric circular array configuration where detectors are evenly distributed around the light source at equal radial distances. This deliberate symmetry ensures uniform detection probability across all detectors, eliminating bias while maintaining manageable system complexity through regular geometric patterns
Solution Approach 2:
The system achieves homogeneous detection conditions by positioning all detectors at equal distances from an isotropic light source. This homogeneous arrangement ensures that each detector operates under identical conditions, guaranteeing uniform detection probability and eliminating positional bias, while the regular circular pattern keeps the overall device complexity manageable
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 significantly increases bit generation speed and randomness by ensuring equal photon detection probability across detectors, allowing for higher-speed true random number generation suitable for applications like quantum cryptography.
Implementation Method 1
generates a bit value of either 0 or 1 according to whether a photon is detected or non-detected
Data Source
AI summary
A random number generating includes a light source to emit a luminous flux having light intensity distribution symmetrical about a center axis, and a plurality of single-photon detectors arranged at an equal radial distance from an extending line of the central axis of the light source to generate a bit value of either 0 or 1 according to whether a photon is detected or not.