Triggered Superradiance and Spin Inversion Storage in a Hybrid Quantum System

We study the superradiant emission of an inverted spin ensemble strongly coupled to a superconducting cavity. After fast inversion, we detune the spins from the cavity and store the inversion for tens of milliseconds, during which the remaining transverse spin components disappear. Switching back on...

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Published inPhysical review letters Vol. 131; no. 4; p. 043601
Main Authors Kersten, Wenzel, de Zordo, Nikolaus, Diekmann, Oliver, Reiter, Tobias, Zens, Matthias, Kanagin, Andrew N, Rotter, Stefan, Schmiedmayer, Jörg, Angerer, Andreas
Format Journal Article
LanguageEnglish
Published United States 28.07.2023
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Abstract We study the superradiant emission of an inverted spin ensemble strongly coupled to a superconducting cavity. After fast inversion, we detune the spins from the cavity and store the inversion for tens of milliseconds, during which the remaining transverse spin components disappear. Switching back on resonance enables us to study the onset of superradiance. A weak trigger pulse of a few hundred photons shifts the superradiant burst to earlier times and imprints its phase onto the emitted radiation. For long hold times, the inversion decreases below the threshold for spontaneous superradiance. There, the energy stored in the ensemble can be used to amplify microwave pulses passing through the cavity.
AbstractList We study the superradiant emission of an inverted spin ensemble strongly coupled to a superconducting cavity. After fast inversion, we detune the spins from the cavity and store the inversion for tens of milliseconds, during which the remaining transverse spin components disappear. Switching back on resonance enables us to study the onset of superradiance. A weak trigger pulse of a few hundred photons shifts the superradiant burst to earlier times and imprints its phase onto the emitted radiation. For long hold times, the inversion decreases below the threshold for spontaneous superradiance. There, the energy stored in the ensemble can be used to amplify microwave pulses passing through the cavity.
Author de Zordo, Nikolaus
Rotter, Stefan
Kersten, Wenzel
Schmiedmayer, Jörg
Angerer, Andreas
Kanagin, Andrew N
Diekmann, Oliver
Reiter, Tobias
Zens, Matthias
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