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quant-ph2025

Superconducting Qubit Gates Robust to Parameter Fluctuations

Emily Wright, Leo Van Damme, Niklas J. Glaser +14

State-of-the-art single-qubit gates on superconducting transmon qubits can achieve the fidelities required for error-corrected computations. However, parameter fluctuations due to…

quant-ph2025

Theory of Multi-photon Processes for Applications in Quantum Control

Longxiang Huang, Jacquelin Luneau, Johannes Schirk +5

We present a general theoretical framework for evaluating multi-photon processes in periodically driven quantum systems, which have been identified as a versatile tool for engineer…

quant-ph2025

Scalable Fluxonium-Transmon Architecture for Error Corrected Quantum Processors

Lukas Heunisch, Longxiang Huang, Stephan Tasler +8

We propose a hybrid quantum computing architecture composed of alternating fluxonium and transmon qubits, that are coupled via transmon tunable couplers. We show that this system o…

quant-ph2025

Niobium Air Bridges as Low-Loss Components for Superconducting Quantum Hardware

N. Bruckmoser, L. Koch, I. Tsitsilin +12

Scaling up superconducting quantum processors requires a high routing density for readout and control lines, relying on low-loss interconnects to maintain design flexibility and de…

quant-ph2024

Sensitivity-Adapted Closed-Loop Optimization for High-Fidelity Controlled-Z Gates in Superconducting Qubits

Niklas J. Glaser, Federico A. Roy, Ivan Tsitsilin +13

Achieving fast and high-fidelity qubit operations is crucial for unlocking the potential of quantum computers. In particular, reaching low gate errors in two-qubit gates has been a…

quant-ph2024

Sub-Harmonic Control of a Fluxonium Qubit via a Purcell-Protected Flux Line

Johannes Schirk, Florian Wallner, Longxiang Huang +21

Protecting qubits from environmental noise while maintaining strong coupling for fast high-fidelity control is a central challenge for quantum information processing. Here, we demo…