Quantum Entanglement Sharing via Time, Frequency, and Spatial Multiplexing
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Solution Overview
Problem
Existing multiplexed quantum communication systems are limited to optical wavelength-division multiplexing, leading to inefficient communication efficiency.
Innovation Solution
A system that shares quantum entanglement by multiplexing photons using a combination of degrees of freedom in time, frequency, and space, utilizing a demultiplexing device for demultiplexing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical wavelength-division multiplexing is used in quantum communication systems, then the system structure is simple and easy to implement, but the communication efficiency is limited and not high
Solution Approach 1:
The patent transitions from one-dimensional wavelength-division multiplexing to three-dimensional multiplexing by incorporating time, frequency, and spatial dimensions. This is achieved through generating photons with different degrees of freedom including polarization states, temporal modes, and spatial modes, thereby exponentially increasing the information capacity per photon while maintaining system feasibility
Solution Approach 2:
The patent changes the multiplexing parameters from solely wavelength to a combination of multiple parameters including polarization angle, temporal delay, and spatial position. By varying these parameters independently, the system achieves higher communication efficiency through multidimensional encoding of quantum information
2Productivity
If only wavelength-division multiplexing is implemented, then the implementation is straightforward, but the quantum entanglement sharing efficiency is low
Solution Approach 1:
The patent segments the quantum communication channel into multiple independent degrees of freedom (polarization, time, space). Each degree of freedom can be independently manipulated and demultiplexed, allowing parallel processing of quantum information and significantly improving entanglement sharing efficiency across multiple receivers
Solution Approach 2:
The demultiplexing device is designed to handle multiple types of multiplexing simultaneously through universal optical components that can separate photons based on polarization, temporal, and spatial characteristics. This multi-functional approach enables efficient routing of quantum information to different receivers without requiring separate systems for each multiplexing type
Data Source
AI summary
Provided is a system in which quantum entanglement is efficiently shared. A system (100) in which quantum entanglement is shared includes: a first device (10); a plurality of second devices (20); and a demultiplexing device, the first device outputting, to the quantum communication channel, photons multiplexed by a combination of a degree of freedom of time, a degree of freedom of frequency, and a degree of freedom of space, the demultiplexing device carrying out a demultiplexing process by a combination of a degree of freedom of time, a degree of freedom of frequency, and a degree of freedom of space.