Quantum amplifiers are critical for achieving high-fidelity, multiplexed, single-shot readout in scalable quantum computing systems. This project develops superconducting parametric amplifiers (PAs) for a home-built quantum computer in Taiwan, organized into four focused subprojects to address diverse qubit technologies and readout requirements.The first two subprojects target traveling-wave parametric amplifiers (TWPAs), which offer broad bandwidth and high dynamic range. One approach employs series-connected Josephson junctions (JJs) made of niobium (Nb) or aluminum (Al) embedded in transmission lines, leveraging their nonlinear inductance. The other explores nonlinear kinetic inductance in ultrathin niobium nitride (NbN) lines, aiming to

Achievements / Technical Highlights
Sub-project 1: Niobium-Based Josephson Junction Array Amplifier
We have successfully realized a niobium-based Josephson junction array quantum parametric oscillator, achieving frequency-tunable amplification with gains up to 7 dB. The junction parameters are carefully engineered to support full photolithographic fabrication, enabling scalable production suitable for quantum sensing, qubit readout, and quantum communication systems. This approach ensures compatibility with standard microfabrication workflows and supports integration into larger quantum hardware platforms.
Sub-project 2: Kinetic Inductance Traveling-Wave Parametric Amplifiers (KITWPAs)
We fabricated KITWPAs using ultra-thin superconducting 

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