研究目的
To validate the feasibility and desirability of a microwave quantum radar by generating and measuring entangled microwave signals using a Josephson parametric amplifier and comparing them to classically correlated signals.
研究成果
The experiment successfully demonstrates the production of entangled microwave signals using a JPA, showing superior correlations compared to classically correlated signals. This validates the feasibility of microwave quantum radar, with potential for low-power applications. Future work includes free-space transmission and comparisons with conventional noise radar.
研究不足
The experiment has not yet transmitted signals through free space or examined robustness against external noise and loss. It is conducted in a laboratory setting with internal noise and loss, and the setup may not be optimal for all radar applications.
1：Experimental Design and Method Selection:
The experiment is designed to generate entangled microwave beams using a Josephson parametric amplifier (JPA) and measure their correlations after amplification. The method involves comparing quantum entangled signals with classically correlated signals that approximate the covariance structure.
2：Sample Selection and Data Sources:
The signals are generated by the JPA at frequencies of
3：2044 GHz and 1554 GHz, and classically correlated signals are produced by mixing a carrier signal with Gaussian noise. Data is collected using digitizers. List of Experimental Equipment and Materials:
JPA, dilution refrigerator, amplifiers (including HEMT), digitizers (AeroFlex), microwave switch, bias tee, circulators, shot-noise tunnel junction (SNTJ), and various microwave components.
4：Experimental Procedures and Operational Workflow:
The JPA is cooled in a dilution refrigerator to cryogenic temperatures (7 mK). Entangled signals are generated and amplified, then measured by digitizers. Classical signals are produced, attenuated, and measured similarly. ROC curves are generated from the data.
5：Data Analysis Methods:
Correlation analysis is performed on the I and Q voltages measured by digitizers. ROC curves are used to evaluate detection performance, with integration over 50,000 samples at a 1 MHz sampling rate.
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