Quantum Channel Selection Using Noise Models in Shared Optical Fibers
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Solution Overview
Problem
The coexistence of classical and quantum signals in optical fibers leads to significant noise interference, degrading quantum signals due to strong noise induced by classical signals, posing challenges in long-distance quantum communication.
Innovation Solution
A method involving noise modeling and neural networks, specifically physics-informed neural networks (PINNs), is used to generate comprehensive noise spectra by combining incoherent and coherent noise models, determining optimal quantum channel parameters such as wavelength, polarization, and encoding protocols to mitigate noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If classical communication signals are transmitted via optical fiber, then communication capacity and infrastructure utilization are improved, but noise interference is generated that degrades quantum signals
Solution Approach 1:
The patent segments the optical channel into multiple quantum channels with different parameters (wavelength, polarization, time slot). By dividing the transmission medium into distinct quantum communication paths, the system can isolate quantum signals from classical noise sources while maintaining shared infrastructure utilization.
Solution Approach 2:
The patent applies local quality by selecting specific quantum channel parameters (wavelength, polarization state, time slot) that are locally optimized for quantum signal transmission. Each quantum channel is configured with specific properties that make it resistant to particular types of noise, allowing quantum and classical signals to coexist in the same fiber with different local characteristics.
2Length of stationary object
If quantum signals are transmitted over long distances via optical fiber, then communication distance is improved, but signal integrity deteriorates due to noise from classical signals
Solution Approach 1:
The patent introduces quantum channel parameters (wavelength, polarization, time slot) as intermediaries that mediate between quantum signals and classical noise. These parameters act as filtering mechanisms that allow quantum signals to propagate through the noisy optical fiber infrastructure while maintaining signal integrity over long distances.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting and optimizing quantum channel parameters (wavelength, polarization state, encoding protocol) based on noise conditions. By changing these parameters, the system adapts to different transmission conditions and maintains reliable quantum communication over varying distances despite the presence of classical signal noise.
3Measurement precision
If multiple noise models are combined to generate comprehensive noise spectra, then noise characterization accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing noise from different classical signal sources using multiple noise models before quantum signal transmission. By generating comprehensive noise spectra in advance and identifying quiet channels beforehand, the system reduces real-time computational requirements while maintaining high noise characterization accuracy for quantum channel selection.
Data Source
AI summary
The techniques described herein relate to a method including: generating a plurality of noise spectra, using a plurality of noise models, of noise generated in an optical channel by classical communication signals provided via the optical channel; generating a combined noise spectrum by combining the plurality of noise spectra; determining a quantum channel parameter for a quantum signal based upon the comprehensive noise spectrum; and providing the quantum signal over the optical channel using the quantum channel parameter.