Quantum Microwave Parametric Interferometer

F. Kronowetter; F. Fesquet; M. Renger; K. Honasoge; Y. Nojiri; K. Inomata; Y. Nakamura; A. Marx; R. Gross; K. G. Fedorov

doi:10.1103/PhysRevApplied.20.024049

Quantum Microwave Parametric Interferometer

F. Kronowetter, F. Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, R. Gross, K. G. Fedorov

Chair of Technical Physics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Classical interferometers are indispensable tools for the precise determination of various physical quantities. Their accuracy is bound by the standard quantum limit. This limit can be overcome by using quantum states or nonlinear quantum elements. Here, we present the experimental study of a nonlinear Josephson interferometer operating in the microwave regime. Our quantum microwave parametric interferometer (QUMPI) is based on superconducting flux-driven Josephson parametric amplifiers combined with linear microwave elements. We perform a systematic analysis of the implemented QUMPI. We find that its interferometric power exceeds the shot-noise limit and observe sub-Poissonian photon statistics in the output modes. Furthermore, we identify a low-gain operation regime of the QUMPI that is essential for optimal quantum measurements in quantum illumination protocols.

Original language	English
Article number	024049
Journal	Physical Review Applied
Volume	20
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevApplied.20.024049
State	Published - Aug 2023

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10.1103/PhysRevApplied.20.024049

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AU - Kronowetter, F.

AU - Fesquet, F.

AU - Renger, M.

AU - Honasoge, K.

AU - Nojiri, Y.

AU - Inomata, K.

AU - Nakamura, Y.

AU - Marx, A.

AU - Gross, R.

AU - Fedorov, K. G.

PY - 2023/8

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AB - Classical interferometers are indispensable tools for the precise determination of various physical quantities. Their accuracy is bound by the standard quantum limit. This limit can be overcome by using quantum states or nonlinear quantum elements. Here, we present the experimental study of a nonlinear Josephson interferometer operating in the microwave regime. Our quantum microwave parametric interferometer (QUMPI) is based on superconducting flux-driven Josephson parametric amplifiers combined with linear microwave elements. We perform a systematic analysis of the implemented QUMPI. We find that its interferometric power exceeds the shot-noise limit and observe sub-Poissonian photon statistics in the output modes. Furthermore, we identify a low-gain operation regime of the QUMPI that is essential for optimal quantum measurements in quantum illumination protocols.

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Quantum Microwave Parametric Interferometer

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