Photon Statistics of Propagating Thermal Microwaves.
In experiments with superconducting quantum circuits, characterizing the photon statistics of propagating microwave fields is a fundamental task. We quantify the n^{2}+n photon number variance of thermal microwave photons emitted from a blackbody radiator for mean photon numbers, 0.05≲n≲1.5. We probe the fields using either correlation measurements or a transmon qubit coupled to a microwave resonator. Our experiments provide a precise quantitative characterization of weak microwave states and information on the noise emitted by a Josephson parametric amplifier.
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.
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Goetz
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.
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Pogorzalek
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany.
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Deppe
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.
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Fedorov
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany.
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Eder
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany.
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Fischer
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.
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Wulschner
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany.
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Xie
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
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Marx
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.|Physik-Department, Technische Universität München, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany.
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Gross