Rapid High-Fidelity Single-Shot Dispersive Readout of Superconducting Qubits
Walter T, Kurpiers P, Gasparinetti S, Magnard P, Potocnik A, Salathe Y, Pechal M, Mondal M, Oppliger M, Wallraff A, Eichler C (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 7
Article Number: 054020
Journal Issue: 5
DOI: 10.1103/PhysRevApplied.7.054020
Abstract
The speed of quantum gates and measurements is a decisive factor for the overall fidelity of quantum protocols when performed on physical qubits with a finite coherence time. Reducing the time required to distinguish qubit states with high fidelity is, therefore, a critical goal in quantum-information science. The state-of-the-art readout of superconducting qubits is based on the dispersive interaction with a readout resonator. Here, we bring this technique to its current limit and demonstrate how the careful design of system parameters leads to fast and high-fidelity measurements without affecting qubit coherence. We achieve this result by increasing the dispersive-interaction strength, by choosing an optimal linewidth of the readout resonator, by employing a Purcell filter, and by utilizing phase-sensitive parametric amplification. In our experiment, we measure 98.25% readout fidelity in only 48 ns, when minimizing readout time, and 99.2% in 88 ns, when maximizing the fidelity, limited predominantly by the qubit lifetime of 7.6 μs. The presented scheme is also expected to be suitable for integration into a multiplexed readout architecture.
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Switzerland (CH)How to cite
APA:
Walter, T., Kurpiers, P., Gasparinetti, S., Magnard, P., Potocnik, A., Salathe, Y.,... Eichler, C. (2017). Rapid High-Fidelity Single-Shot Dispersive Readout of Superconducting Qubits. Physical Review Applied, 7(5). https://doi.org/10.1103/PhysRevApplied.7.054020
MLA:
Walter, T., et al. "Rapid High-Fidelity Single-Shot Dispersive Readout of Superconducting Qubits." Physical Review Applied 7.5 (2017).
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