Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 21: Superconducting Qubits
QI 21.4: Talk
Wednesday, March 12, 2025, 15:30–15:45, HS II
Exploring the Fidelity of Flux Qubit Measurement in Different Bases via Quantum Flux Parametron — •Yanjun Ji1, Susanna Kirchhoff1,2, and Frank K. Wilhelm1,2 — 1Institute for Quantum Computing Analytics (PGI-12), Forschungszentrum Jülich, 52045 Jülich, Germany — 2Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany
High-fidelity qubit measurement is essential for building practical quantum computing systems. We investigate methods for maximizing the measurement fidelity of flux qubits using a quantum flux parametron (QFP) readout scheme. Theoretical modeling and numerical simulations are conducted to explore the impact of different measurement bases on the fidelity for single flux qubit and coupled two-qubit systems. Our simulations show that for single qubit systems dressed bases consistently outperform bare bases. For coupled qubit systems, two measurement schemes are compared: sequential and simultaneous. Both schemes focus on reading out a single target qubit within coupled qubit systems. The results indicate that the highest fidelity can be achieved through either sequential measurement in the dressed basis over a longer duration or simultaneous measurement in the bare basis over a shorter duration. However, sequential measurement schemes offer more robust readouts with higher fidelity than simultaneous schemes, which introduce complexity from interactions between QFPs. Our analysis quantifies achievable fidelities for various configurations, offering valuable insights for optimizing measurement processes in emerging quantum computing architectures.
Keywords: Superconducting qubits; Quantum flux parametron; Qubit readout schemes; Qubit measurement bases; Quantum computing architectures