Niobium Titanium Nitride (NbTiN)
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**Superconducting Materials**

 

Optimised Alloy for Low-Loss Microwave Circuits

**Tc ≈ 15 K**

 

Niobium Titanium Nitride (NbTiN)
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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