Thermal-Light Quantum Random Number Generators for Compact True Randomness
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Solution Overview
Problem
Existing random number generators (RNGs) are either costly, require excessive wafer area, or produce pseudo-random numbers that are not completely statistically unrelated, necessitating the need for alternative approaches that are more efficient, smaller in size, and robust.
Innovation Solution
Quantum random number generators (QRNGs) utilize the irreducible unpredictability of quantum physics in thermal light intensity fluctuations, specifically harnessing Bose-Einstein statistics of photons to generate true random bit streams with high entropy, capable of operating at ultra-high rates and low cost, and are designed with self-test and fail-safe features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrical circuit based RNGs utilizing thermal or shot noise are used, then random numbers can be generated, but the device requires excessive wafer area when implemented in an integrated circuit
Solution Approach 1:
The patent replaces conventional electrical circuit-based random number generation (using thermal or shot noise) with a quantum-based approach using a single-photon detector. This substitution of the underlying physical mechanism dramatically reduces the required wafer area while maintaining random number generation capability, directly resolving the technical contradiction between reliability and device area.
2Area of stationary object
If software-based RNGs are used, then device size is reduced, but the generated numbers are pseudo-random and not completely statistically unrelated
Solution Approach 1:
The patent replaces software-based pseudo-random generation with quantum-based true random number generation using a single-photon detector. The quantum measurement process inherently produces statistically unrelated random numbers, while the integrated circuit implementation keeps the device size small, simultaneously achieving both compact form factor and true statistical randomness.
3Productivity
If conventional RNGs are implemented to provide long sequences of random numbers, then productivity is improved, but the numbers eventually become pseudo-random and lose statistical independence
Solution Approach 1:
The patent replaces conventional RNG mechanisms with quantum-based single-photon detection. The quantum measurement process generates truly random numbers with statistical independence that does not degrade over time, enabling long sequences of random numbers to be produced while maintaining statistical independence throughout, thus resolving the contradiction between productivity and reliability.
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
QRNGs produce random numbers with full quantum entropy, passing comprehensive statistical randomness tests, and are compact, cost-effective, and robust, suitable for cryptographic applications with high-speed operation.
Implementation Method 1
a single-photon detector to detect photons from a weak laser source
Implementation Method 2
generating a random signal, based on quantum noise in the phase of two or more input signals. The generated output random signal has random variation in its intensity based on the quantum noise in the phases of the input signals
Data Source
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AI summary
Random number generators include a thermal optical source and detector configured to produce random numbers based on quantum-optical intensity fluctuations. An optical flux is detected, and signals proportional to optical intensity and a delayed optical intensity are combined. The combined signals can be electrical signals or optical signals, and the optical source is selected so as to have low coherence over a predetermined range of delay times. Balanced optical detectors can be used to reduce common mode noise, and in some examples, the optical flux is directed to only one of a pair of balanced detectors.