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Noise amplification by chaotic dynamics in a delayed feedback laser system and its application to nondeterministic
Satoshi Sunada1, Takahisa Harayama, Peter Davis
1NTT Communication Science Laboratories, NTT Corporation, 2-4 Hikaridai Seika-cho, Soraku-gun, Kyoto 619-0237, Japan. sunada@se.kanazawa-u.ac.jp
Chaos (Woodbury, N.Y.)
|January 3, 2013
Summary
We experimentally observed how microscopic noise amplifies in chaotic lasers, transforming into macroscopic fluctuations. This noise amplification is key for developing secure random bit generators.
Area of Science:
- Nonlinear Dynamics
- Laser Physics
- Quantum Optics
Background:
- High-dimensional chaotic laser systems with delayed feedback exhibit complex dynamics.
- Understanding the amplification of intrinsic noise is crucial for controlling chaotic systems.
Purpose of the Study:
- To develop an experimental method for directly observing intrinsic noise amplification in chaotic lasers.
- To investigate the application of these systems in physical random bit generation.
Main Methods:
- Repeatedly switching a delayed-feedback laser between stable and chaotic states.
- Measuring the time evolution of an ensemble of chaotic states from identical initial conditions.
- Analyzing the probability density of output light intensity.
Main Results:
- Direct observation of microscopic intrinsic noise amplification into macroscopic fluctuations.
- Experimental demonstration of output intensity probability density converging to a natural invariant density in strongly chaotic regimes.
- Validation of the role of invariant density convergence in nondeterministic random bit generation.
Conclusions:
- The experimental method provides direct insight into noise amplification in chaotic lasers.
- Chaotic laser systems are promising for high-security random bit generation.
- Invariant density convergence is fundamental for reliable random number generation.
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