Integrated Quantum Random Noise Generator Using Vacuum States
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Solution Overview
Problem
Existing quantum-random number generators based on measuring quantum vacuum states of light have a large footprint, high power consumption, and high cost, making them unsuitable for many applications.
Innovation Solution
An integrated quantum vacuum state of light-based quantum-random noise source is developed, utilizing a semiconductor laser coupled with an optical directional coupler and balanced photodetectors on a substrate, generating a random Gaussian-distributed signal that is processed to produce a high-frequency analogue electronic signal and subsequently a random digital bit stream, with a smaller footprint and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional quantum-random number generators based on measuring quantum vacuum states of light are used, then high-quality nondeterministic random numbers are generated, but the device has a large footprint, high power consumption, and high cost
Solution Approach 1:
The patent combines multiple functional components (laser source, beam splitter, photodetectors, and signal processing electronics) into a single integrated circuit device. This merging of previously separate components into one compact unit directly reduces the device footprint while maintaining the quantum vacuum state measurement functionality that generates high-quality random numbers
Solution Approach 2:
The integrated circuit is designed to perform multiple functions within a single device: generating coherent light, splitting the beam, detecting photodetector signals, and processing the output. This multi-functionality allows the device to maintain full quantum-random number generation capability while occupying minimal space
2Reliability
If traditional quantum-random number generators based on measuring quantum vacuum states of light are used, then high-quality nondeterministic random numbers are generated, but the device consumes high power
Solution Approach 1:
By integrating the laser driver, photodetector readout electronics, and signal processing circuits into a single unified device, power consumption is reduced through optimized power distribution and eliminated redundant circuitry. The integrated design allows for more efficient energy utilization while maintaining the quantum measurement process that generates high-quality random numbers
3Reliability
If traditional quantum-random number generators based on measuring quantum vacuum states of light are used, then high-quality nondeterministic random numbers are generated, but the device has high cost
Solution Approach 1:
The integration of all components into a single circuit device simplifies the manufacturing process by reducing the number of discrete parts that need to be assembled and tested. This unified approach enables more efficient production and reduces overall device cost while preserving the quantum vacuum state measurement capability that ensures high-quality random number generation
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
The solution provides a compact, low-power, and cost-effective quantum random noise source suitable for cryptographic applications, generating nondeterministic random bits with improved entropy and reduced bias.
Implementation Method 1
The oscillator typically comprises a semiconductor laser which is coupled by a waveguide to an optical directional coupler which divides the input wave-guided light into two output waveguides. A vacuum state of light, defined as the absence of photons of light, is coupled into both outputs as a result of this light-splitting process
Implementation Method 2
The light in the two waveguides output from the optical directional coupler are separately supplied to a pair of balanced photodetectors. Each photodetector outputs a photocurrent in response which is proportional to the light incident on it
Data Source
AI summary
An integrated quantum random noise source includes a substrate, an optical oscillator that may be integral to the substrate coupled by an optical waveguide to an optical directional coupler. The optical directional coupler has two outputs that are coupled by optical waveguides to a pair of photodetectors that are part of a balanced photodetector. The balanced photodetector in response outputs an analogue signal proportional to the difference in photocurrents of the two photodetectors. The analogue output signal from the balanced photodetector is a random Gaussian-distributed signal representative of quadrature measurements on the quantum vacuum state of light. The random noise source can be coupled other apparatus to provide a source of random bits.