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quant-ph2026

Precise 2D electric field density simulations for superconducting quantum devices

Zydrunas Gimbutas, Wei-Ren Syong, Nhi Nguyen +5

Dielectric loss due to two-level systems is a limiting factor for superconducting qubit relaxation times. These losses arise mostly from nanometer-scale interfacial defect regions…

quant-ph2026

Multi-stage Quantum Amplifier Readout Chain

Logan Howe, Andrea Giachero, Michael Vissers +5

Multi-stage cryogenic readout chains with a wide bandwidth and added noise within a few quanta of the quantum limit are frequently constructed using traveling-wave parametric ampli…

quant-ph2025

Compact Superconducting Kinetic Inductance Traveling Wave Parametric Amplifiers with On-chip rf Components

Logan Howe, Andrea Giachero, Michael Vissers +4

Quantum computing systems and fundamental physics experiments using superconducting technologies frequently require signal amplification chains operating near the quantum limit of…

quant-ph2025

Measurable Improvement in Multi-Qubit Readout Using a Kinetic Inductance Traveling Wave Parametric Amplifier

M. A. Castellanos-Beltran, L. Howe, A. Giachero +4

Increasing the size and complexity of quantum information systems requires highly-multiplexed readout architectures, as well as amplifier chains operating near the quantum limit (Q…

quant-ph2024

Computed models of natural radiation backgrounds in qubits and superconducting detectors

Joseph Fowler, Ian Fogarty Florang, Nathan Nakamura +3

Naturally occurring radiation backgrounds cause correlated decoherence events in superconducting qubits. These backgrounds include both gamma rays produced by terrestrial radioisot…