Decoherence metrology and mitigation for novel superconducting qubits*

Further improvements to the performance of superconducting qubits are required in order to ease the burden of quantum error correction algorithms as quantum processors grow in scale and complexity. Recent advances in materials quality and processing techniques combined with informed device design to reduce sensitivity to dominant sources of decoherence have resulted in steadily improving control fidelities. Another approach is to engineer protection against errors at the Hamiltonian level by encoding information in a basis that is intrinsically protected against certain noise channels. These noise-protected superconducting qubits can be comprised of new circuit elements or be susceptible to new mechanisms of decoherence, all of which need to be characterized. This talk will discuss recent efforts from our team across the aforementioned research areas to enhance superconducting qubit performance.