  Ultra low-loss microwave materials are crucial for enhancing quantum
coherence and scalability of superconducting qubits. Van der Waals (vdW)
heterostructure is an attractive platform for quantum devices due to the
single-crystal structure of the constituent two-dimensional (2D) layered
materials and the lack of dangling bonds at their atomically sharp interfaces.
However, new fabrication and characterization techniques are required to
determine whether these structures can achieve low loss in the microwave
regime. Here we report the fabrication of superconducting microwave resonators
using NbSe$_2$ that achieve a quality factor $Q > 10^5$. This value sets an
upper bound that corresponds to a resistance of $\leq 192 \mu\Omega$ when
considering the additional loss introduced by integrating NbSe$_2$ into a
standard transmon circuit. This work demonstrates the compatibility of 2D
layered materials with high-quality microwave quantum devices.
