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.

arXiv comment6 pages, 4 figures

References in corpus (18)

• Charge insensitive qubit design derived from the Cooper pair box
• Circuit Quantum Electrodynamics
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• The Superconducting TESLA Cavities
• A quantum memory with near-millisecond coherence in circuit QED
• Observation of coherent perfect absorption at an exceptional point
• Perspectives on quantum transduction
• Quantum Noise Theory of Exceptional Point Sensors
• Electromagnetically induced transparency at a chiral exceptional point
• On-demand quantum state transfer and entanglement between remote microwave cavity memories
• Loss-enabled sub-Poissonian light generation in a bimodal nanocavity
• Measurement of the decay of Fock states in a superconducting quantum circuit
• Understanding Quality Factor Degradation in Superconducting Niobium Cavities at Low Microwave Field Amplitudes
• Optimized heat transfer at exceptional points in quantum circuits
• Single Photon Level Study of Microwave Properties of Lithium Niobate at milli-Kelvin Temperatures
• 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