Abstract
We propose that the insertion of a metallic tip into a superconducting cavity resonator can ensure the strong coupling condition between quantum bits (qubits) and microwave photons, which is a requirement for quantum information processing using cavity quantum electrodynamics (QED). By using a 3D electromagnetic numerical simulator, we estimated the strength of the local electric field in a cavity resonator, and found that it can be enhanced up to ∼100 mV/m, which is 100 times larger than the value achieved in a Fabry‐Perot resonator. As a possible application, we propose a cavity QED experiment using microwave photons and Josephson qubits realized in the intrinsic Josephson junction of cuprate high temperature superconductors.
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