Quantum Receiver Square Homodyne Detection Target Radar
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Solution Overview
Problem
Current quantum receivers for quantum illumination face challenges in measuring signal interrelations due to high noise and low reflectivity, leading to increased error ratios and complexity, especially when using non-linear optic devices with average quantum numbers less than 1.
Innovation Solution
A quantum receiver employing square of homodyne detection using a 50:50 beam splitter and two light quantity measurers for homodyne detection, which mixes and measures signal and idler quantum states without non-linear optical devices, improving measurement efficiency and reducing error ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-linear optic devices are used for quantum illumination measurement, then measurement capability is improved, but device complexity and difficulty of operation increase
Solution Approach 1:
The patent extracts and removes the non-linear optic device from the quantum illumination measurement system. Instead of using complex non-linear optical components, the invention uses only linear optical elements (beam splitter, phase shifters, detectors) to achieve the measurement function, thereby simplifying the device configuration while maintaining measurement capability.
Solution Approach 2:
The patent creates a simplified copy of the measurement function that can be achieved through linear optics. By using a beam splitter to mix the returned signal with a preserved signal, and phase shifters to control interference, the system replicates the essential measurement capability without requiring non-linear optical devices.
2Measurement precision
If non-linear optic devices are used for quantum illumination measurement, then measurement capability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts and removes the non-linear optic device from the quantum illumination measurement system. Instead of using complex non-linear optical components, the invention uses only linear optical elements (beam splitter, phase shifters, detectors) to achieve the measurement function, thereby simplifying the device configuration while maintaining measurement capability.
3Device complexity
If classical illumination is used, then device complexity is reduced, but error ratio increases under low reflectivity and high noise conditions
Solution Approach 1:
The patent introduces an intermediary preserved signal that is mixed with the returned signal through a beam splitter. This preserved signal acts as a reference that maintains quantum correlations, enabling the system to distinguish true targets from noise even in low reflectivity conditions. The intermediary signal mediates between the simple linear optical setup and the quantum measurement capability.
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 solution simplifies test configurations and enhances measurement efficiency, achieving lower error ratios compared to classical illumination, with improved signal-to-noise ratios and accurate target detection even at low reflectivity levels.
Implementation Method 1
quantum receiver using square of homodyne detection
Implementation Method 2
a first 50:50 beam splitter mixing signals traveling inside through an input terminal
Data Source
AI summary
The objective of the present invention is to provide a quantum receiver using square of homodyne detection for detecting a target of a quantum radar by using the square of homodyne detection that uses homodyne detection used in quantum information processing using continuous variables, and data processing, and a measurement method therefore. In order to achieve the above objective, the quantum receiver for detecting a target of a quantum radar using the square of homodyne detection according to the present invention comprises: a first 50:50 beam splitter for mixing signals coming into an input terminal; and two light quantity measurement units for measuring the quantity of light respectively outputted to two output terminals of the first 50:50 beam splitter.