Single-Photon Source Device Waveguide Extraction Efficiency
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Solution Overview
Problem
Current single-photon source devices in quantum cryptography communication systems have limited efficiency in extracting single photons, which affects the security and reliability of quantum cryptography communication.
Innovation Solution
A single-photon source device is designed with a substrate, straight waveguide, and ring waveguide, incorporating point defects and electrodes made of silicon carbide, silicon, or silicon nitride, to enhance the extraction efficiency of single photons by utilizing point defects and electric fields to generate and tune single photons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is used with attenuated intensity to generate single photons, then quantum cryptography communication can be implemented, but the extraction efficiency of single photons is limited
Solution Approach 1:
The patent changes the physical parameters of the light source by introducing point defects (vacancies, antisite defects) in the silicon carbide crystal structure. These defect parameters create localized states that enable efficient single photon generation and extraction, transforming the material's optical properties to achieve both high reliability and improved extraction efficiency
Solution Approach 2:
The patent employs composite material structure combining silicon carbide with point defects (such as carbon vacancies, silicon vacancies, and antisite defects). This composite approach at the atomic level creates unique optical properties that enhance single photon extraction efficiency while maintaining the security requirements for quantum cryptography communication
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 device significantly increases the extraction efficiency of single photons, improving the security and reliability of quantum cryptography communication by effectively generating and managing single photons within the communication wavelength band.
Implementation Method 1
a first coupling layer which is provided on the straight waveguide and has a first point defect... uses the first light to generate a single photon
Implementation Method 2
a ring waveguide which is adjacent to the straight waveguide... disposed on the lower clad layer
Data Source
AI summary
Provided are a single-photon source device and a single-photon source system including same. The single-photon source device includes a substrate, a straight waveguide extending in a first direction on the substrate, a first coupling layer which is provided on the straight waveguide and has a first point defect, at least one first electrode which is adjacent to the first point defect and provided on the first coupling layer, a ring waveguide which is adjacent to the straight waveguide and provided on the substrate, and at least one second electrode provided on the ring waveguide.