Phase-controlled improvement of photon lifetime in coupled superconducting cavities

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 two improvement in the cavity photon lifetime. The results can bring rich revenue to quantum information science, sensing, and high-energy physics.

6 pages, 4 figures

References in corpus (5)

• Charge insensitive qubit design derived from the Cooper pair box
• Observation of coherent perfect absorption at an exceptional point
• Quantum computing hardware for HEP algorithms and sensing
• Searches for New Particles, Dark Matter, and Gravitational Waves with SRF Cavities
• Demonstrating a superconducting dual-rail cavity qubit with erasure-detected logical measurements