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Article Dans Une Revue Physical Review X Année : 2020

Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling

C. Naud
Nicolas Roch

Résumé

Qubit readout is an indispensable element of any quantum information processor. In this work, we experimentally demonstrate a nonperturbative cross-Kerr couplingbetween a transmon and polariton mode which enables an improved quantum nondemolition (QND) readout for superconducting qubits. The new mechanism uses the same experimental techniques as the standard QND qubit readout in the dispersive approximation, but due to its nonperturbative nature, it maximizes the speed, the single-shot fidelity, and the QND properties of the readout. In addition, it minimizes the effect of unwanted decay channels such as the Purcell effect. We observe a single-shot readout fidelity of 97.4% for short 50-ns pulses and we quantify a QND-ness of 99% for long measurement pulses with repeated single-shot readouts.
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Dates et versions

hal-03044554 , version 1 (07-12-2020)

Identifiants

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R. Dassonneville, T. Ramos, V. Milchakov, L. Planat, Étienne Dumur, et al.. Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling. Physical Review X, 2020, 10 (1), pp.011045. ⟨10.1103/physrevx.10.011045⟩. ⟨hal-03044554⟩

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