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Long-coherence-time cavities are crucial for various fundamental physicalstudies and applications. Here we find that by coupling two cavities directlyor via a phase-tunable coupling channel, the coherence time of the local fieldcan exceed that of the bare cavities. The coherence time is modified by thephases of the initial states and the phase accumulation on the coupling channelwhich affect the interference between cavities. In experiments, by couplingsuperconducting radio-frequency cavities via phase-tunable cables, we realize afactor of two improvement in the cavity coherence time. The results can bringrich revenue to quantum information science, sensing, and high-energy physics.

Phase-controlled improvement of coherence time in coupled superconducting cavities