Chaos Amplifying Quantum Noise for High-Speed Random Number Generation
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Solution Overview
Problem
Current quantum random number generators lack the capability for real-time high-speed generation of information-theoretically provable random numbers, which is crucial for secure communication systems, as they often rely on classical noise reduction methods that are not efficient in ensuring the security and randomness of generated keys.
Innovation Solution
The method involves chaos amplifying quantum noise to increase entropy content, using an external cavity feedback laser to generate chaotic light, balanced homodyne detection to extract quadrature fluctuations, and parallel processing with FPGAs for universal Hash post-processing to achieve real-time high-speed quantum random number generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If quantum random number generators use classical noise reduction methods, then device complexity is reduced, but the security and randomness of generated keys deteriorate
Solution Approach 1:
The patent extracts and amplifies only the quantum noise component from the chaotic laser signal using balanced homodyne detection, separating it from classical noise sources. This extraction principle allows the system to eliminate classical noise reduction methods while maintaining high security and randomness through pure quantum noise utilization
Solution Approach 2:
The patent changes the detection parameter from intensity measurement to quadrature fluctuation measurement. By measuring the quadrature fluctuations of the chaotic laser field, the system directly accesses quantum noise with information-theoretically provable randomness, achieving both high security and simplified device architecture
2Reliability
If quantum random number generators increase quantum noise proportion, then security and randomness are improved, but generation speed deteriorates due to post-processing requirements
Solution Approach 1:
The patent performs preliminary action by pre-generating and storing multiple random number sequences from different quantum noise measurements, then uses parallel post-processing to generate the final random number stream. This approach allows the system to maintain high quantum noise proportion for security while achieving fast generation speeds through parallel processing
Solution Approach 2:
The patent implements periodic action by continuously measuring quadrature fluctuations at different time points and combining these periodic measurements through parallel post-processing. This periodic measurement approach ensures high quantum randomness while maintaining sustained high-speed generation capability
3Productivity
If parallel processing is implemented for universal Hash post-processing, then generation speed is improved, but device complexity increases
Solution Approach 1:
The patent segments the post-processing task into multiple parallel universal Hash processing channels, each handling a portion of the random number generation. This segmentation enables parallel processing that achieves real-time high-speed generation (above 10 Gbps) while keeping each individual processing unit relatively simple
Solution Approach 2:
The patent uses universal Hash functions that can process multiple quantum noise measurement results through the same processing logic. This universality allows parallel processing implementation where the same hardware or software module can handle different measurement streams, reducing overall device complexity while maintaining high generation speeds
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 approach significantly enhances the robustness and true random number extraction ratio, enabling scalable and secure quantum random number generation at rates above 10 Gbps with information-theoretically provable security and high bandwidth.
Implementation Method 1
generating a chaotic light field based on an external cavity feedback laser: a laser beam emitted by a DFB laser sequentially passes through a polarization controller, a circulator, a 50/50 fiber coupler, a tunable attenuator, an optical isolator, and a fiber filter to form a chaotic laser beam
Implementation Method 2
establishing a balanced homodyne detection system, and extracting quadrature fluctuation noise of high-frequency quantum modes of the chaotic laser field as entropy source for generating quantum random numbers
Implementation Method 3
Based on chaos amplifying quantum noise, true random entropy content in a quantum entropy source measurement can be increased significantly
Data Source
AI summary
A bottleneck in the continuous-variable quantum random number generation rate is mainly as follows: low quantum entropy content in actual quantum measurement on quantum entropy source, and low real-time post-processing rate in extraction of true random numbers. Therefore, the present disclosure aims to provide a method of real-time high-speed quantum random number generation based on chaos amplifying quantum noise, to greatly increase the quantum entropy content through the chaos amplifying quantum noise, perform parallel implementation of universal Hash post-processing of multichannel quantum random numbers, and implement real-time high-speed quantum random number generation. The present disclosure provides a cost-effective, highly scalable, and highly integrated entropy-increase scheme for device-independent, semi-device-independent, and device-trusted quantum random number generators that use continuous-variable quantum noise as an entropy source, effectively promoting the application of the continuous-variable quantum random number generators.