Niobium Titanium Nitride (NbTiN)

Superconducting Materials

Optimised Alloy for Low-Loss Microwave Circuits

Tc ≈ 15 K

Niobium Titanium Nitride (NbTiN)

Optimised Alloy for Low-Loss Microwave Circuits

Role in quantum circuits

High-Q microwave resonators, MKID arrays, qubit coupling elements, SQUIDs

Why it matters

NbTiN combines the high Tc of NbN with improved thin-film uniformity and magnetic field

resilience. It is widely used for microwave resonators requiring both high quality factor (Q) and resilience to in-plane magnetic fields, making it superior for large-scale qubit arrays and flux-tunable designs.

Key facts

• Higher Q resonators compared to plain Nb films

• Resilient to in-plane magnetic fields — ideal for fluxonium qubits

• Excellent film uniformity over large (4-inch+) wafers

• Critical for SQUIDs and superconducting interference devices

• Useful for scalable quantum-platform fabrication flows