Quantum Microwave Parametric Interferometer

作者：F. Kronowetter, Florian Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Yasunobu Nakamura, Achim Marx, R. Gross, Kirill G. Fedorov · 发表于：Physical Review Applied · 年份：2023 · DOI：10.1103/physrevapplied.20.024049 · 被引用次数：8 · 研究领域：Quantum Information and Cryptography、Quantum Mechanics and Applications、Cold Atom Physics and Bose-Einstein Condensates

Interferometers are extremely powerful tools for precision measurements in a plethora of research fields and applications, such as the detection of gravitational waves. The authors present experimental realization of a nonlinear microwave interferometer based on superconducting quantum circuits. Useful properties of this device range from a signal-to-noise ratio that exceeds the shot-noise limit, to sub-Poissonian intensity fluctuations between its outputs. These intriguing findings will promote applications ranging from quantum illumination to the search for axionic dark matter.