Quantum Key Generation Using Non-Uniform Multicore Fiber Delay
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Solution Overview
Problem
Current quantum key generation systems face limitations in achieving high bit rates for quantum key generation, particularly in maintaining efficient photon propagation and entanglement across extended distances with varying environmental conditions.
Innovation Solution
The system employs two photon entanglement chains with quantum repeaters and terminating quantum memories, connected by multicore optical fiber links with non-uniform cores to provide non-uniform photon propagation delay, enabling entanglement swapping and increasing bit rates through cross-chain quantum repeaters and detector units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If quantum key generation systems use conventional optical fiber links with uniform cores, then photon propagation is simplified, but alignment efficiency deteriorates under environmental changes
Solution Approach 1:
The patent applies local quality by implementing non-uniform core structures in specific regions of the optical fiber links. The fiber links contain first regions with first core structures and second regions with second core structures, where the core structures differ in properties such as core diameter, refractive index, or number of cores. This localized variation compensates for environmental changes and maintains alignment efficiency without requiring the entire fiber link to be complex.
2Productivity
If quantum key generation systems use entanglement chains with quantum repeaters, then bit rate increases, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the quantum key generation system into multiple entanglement chains, each comprising quantum repeaters and terminating quantum memories. The system is further segmented into first and second regions with different fiber link characteristics. This segmentation allows independent optimization of each segment, enabling high bit rates through parallel entanglement generation while managing overall system complexity through modular architecture.
Solution Approach 2:
The patent applies universality by designing quantum repeaters that can operate within different entanglement chains and across different fiber link regions. The quantum repeaters and terminating quantum memories serve multiple functions: generating entanglement, maintaining quantum states, and enabling key distribution across varying environmental conditions. This multi-functionality reduces the need for specialized components for each specific function, thereby managing complexity while maintaining high productivity.
3Length of stationary object
If quantum key generation systems operate over extended distances, then coverage area increases, but photon propagation efficiency deteriorates
Solution Approach 1:
The patent applies local quality by implementing different fiber link structures in different spatial regions. First fiber links connect to first terminating quantum memories while second fiber links connect to second terminating quantum memories, with each region optimized for its specific distance and environmental conditions. This allows extended transmission distance while maintaining photon propagation efficiency through localized optimization of core structures, refractive indices, and other fiber parameters.
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 configuration enhances quantum key bit generation rates up to 100 MHz, maintaining alignment and efficiency despite environmental changes, and allows for high-rate quantum key formation with increased complexity.
Implementation Method 1
The quantum repeater of each photon entanglement chain is structurally configured to entangle a pair of photons
Implementation Method 2
The plurality of multicore optical fiber links are structurally configured to optically couple the quantum repeater of each photon entanglement chain to the first and second terminating quantum memories
Implementation Method 3
The plurality of multicore optical fiber links each comprise at least two non-uniform cores structurally configured to provide non-uniform photon propagation delay
Implementation Method 4
first and second terminating quantum memories positioned at first and second ends of the photon entanglement chains
Implementation Method 5
The first and second terminating quantum memories of each of the two photon entanglement chains form first and second cross-chain quantum repeaters, respectively, to generate measurable entangled particles
Data Source
AI summary
A quantum key generation system including two photon detector units, two photon entanglement chains extending between the two photon detector units, and a plurality of multicore fiber links each including at least two non-uniform cores structurally configured to provide non-uniform photon propagation delay. Each photon entanglement chain includes at least one quantum repeater structurally configured to entangle a pair of photons and first and second terminating quantum memories optically coupled the quantum repeater using the multicore fiber links such that photons received by the first and the second terminating quantum memories are entangled with photons entangled by the quantum repeater. The first and second terminating quantum memories of each of the two photon entanglement chains form first and second cross-chain quantum repeaters, and the first and the second photon detector units are structurally configured to receive the measurable entangled particles generated by the first and second cross-chain quantum repeaters, respectively.