Exploration of potential multi-mode architectures for 3D SRF QPUs*

Decoherence is a key limiting parameter in quantum computing that determines the lifetime of quantum states. Multi-cell superconducting (SRF) cavities with long coherence are promising devices to achieve a large computational quantum volume for a prospective quantum processor based on bosonic qubits. We present preliminary architectural studies and solutions to determine optimal multi-mode devices as quantum processing units (QPUs) via 3D circuit Quantum Electrodynamics (cQED).

This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Superconducting Quantum Materials and Systems Center (SQMS) under contract number DE-AC02-07CH11359.