Low-Loss Superconducting Integrated Circuits (LLSICs)

In recent years, the field of superconducting integrated circuits has witnessed significant advancements. These technologies are central to a variety of applications, including quantum computing. The need for these circuits is driven by the demand for high-performance, efficient, and low-loss devices that can support complex computations. However, the main problem with the current approaches lies in the quality and loss factors. Because resonators and qubits are often exposed to severe stresses during manufacture, current techniques end up producing components that suffer from high losses and subpar quality. This inefficiency reduces the overall performance of these superconducting devices.

Technology Description

The superconducting integrated circuit has at least one superconducting resonator composed of a substrate and a conductive layer placed over the surface of this substrate. This conductive layer incorporates at least one conductive element, specifically a polycrystalline titanium nitride (TiN) material that has a significantly low internal stress, less than around two hundred fifty MPa (magnitude). The device, a superconducting resonator and/or qubits, has a substantially high quality factor and is low loss. What differentiates this technology is the particular utilization of a low-stress TiN in the manufacturing process. This material's low internal stress (less than two hundred fifty MPa) not only delivers superconducting resonators and qubits of superior quality but also ensures they are low loss. Consequently, this technology yields superconducting devices that register better performance metrics in comparison to traditional alternatives.