Quantum amplifiers are vital for high-fidelity, multiplexed, single-shot qubit readout. This Taiwan-based project develops superconducting parametric amplifiers (PAs) across four subprojects: two focus on traveling-wave designs using Josephson junctions (Nb/Al) or ultrathin NbN for junction-free fabrication; one targets wafer-scale aluminum JPAs with quantum-limited noise; and one designs amplifiers for semiconductor-spin qubits. Co-developed with qubit teams, these amplifiers enhance scalability, control precision, and readout performance.

We developed three quantum amplifier types: (1) Nb-based Josephson junction arrays with tunable gain up to 7 dB, compatible with full photolithography; (2) junction-free KITWPAs using ultrathin NbN films for robust, broadband amplification; (3) Al-based LJPAs with >15 dB gain, >50 MHz bandwidth, and tunable 2–6 GHz operation, advancing toward multilayer integration.

Superconducting quantum amplifiers offer ultra-low noise and high sensitivity, enabling precise qubit readout and microwave signal detection. They are vital in quantum computing, sensing, and secure communication. With growing demand in aerospace, metrology, and quantum hardware, their industrial value and commercial potential are rapidly rising.