Progress towards storage resonators for Bosonic circuit QED systems in the W-band

Recent progress in bosonic circuit QED (cQED) setups hold promise as a hardware efficient route to fault tolerant quantum computation. One of the core components of such a setup is a high-Q cavity which serves as long-lived quantum memory to store fragile quantum information, instead of storing it in the Hilbert space of the two-level system (qubit). In this work, we will present finite element electromagnetic simulations alongside measurement results on different copper “Pillbox” cavities designed in the W-band (75-110 GHz). Eventually, this cavity will host a Sapphire chip with a patterned nonlinearity and a readout resonator to demonstrate a bosonic cQED system with universal control over the memory state.