Phase-controlled improvement of photon lifetime in coupled superconducting cavities
Changqing Wang, Oleksandr S. Melnychuk, Crispin Contreras-Martinez, Yao Lu, Yuriy M. Pischalnikov, Oleg Pronitchev, Bianca Giaccone, Roman Pilipenko, Silvia Zorzetti, Sam Posen, Alexander Romanenko, Anna Grassellino
DOI 10.1103/PhysRevApplied.21.024040 · Physical Review Applied
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Abstract
High-quality cavities are crucial for various fundamental physical studies and applications. Here we find that by coupling two cavities directly or via a phase-tunable coupling channel, the photon lifetime of the local field can exceed that of the bare cavities. The cavity photon lifetime is modified by the phases of the initial states and the phase accumulation on the coupling channel, which affect the interference between cavities. In experiments, by coupling superconducting radio-frequency cavities via phase-tunable cables, we realize a factor of 2 improvement in the cavity photon lifetime. The results can bring rich revenue to quantum information science, sensing, and high-energy physics.
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