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Article Dans Une Revue Physical Review Applied Année : 2020

Nondegenerate Parametric Amplifiers Based on Dispersion-Engineered Josephson-Junction Arrays

Résumé

Determining the state of a qubit on a time scale much shorter than its relaxation time is an essential requirement for quantum information processing. With the aid of a nondegenerate parametric amplifier, we demonstrate the continuous detection of quantum jumps of a transmon qubit with 90% fidelity of state discrimination. Entirely fabricated by standard two-step optical-lithography techniques, this type of parametric amplifier consists of a dispersion-engineered Josephson-junction (JJ) array. By using long arrays, containing 10 3 JJs, we can obtain amplification in multiple eigenmodes with frequencies below 10 GHz, which is the typical range for qubit readout. Moreover, if a moderate flux tunability of each mode is introduced, employing superconducting-quantum-interference-device junctions, a single amplifier device could potentially cover the entire frequency band between 1 and 10 GHz.
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Dates et versions

hal-04137621 , version 1 (22-06-2023)

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Patrick Winkel, Ivan Takmakov, Dennis Rieger, Luca Planat, Wiebke Guichard, et al.. Nondegenerate Parametric Amplifiers Based on Dispersion-Engineered Josephson-Junction Arrays. Physical Review Applied, 2020, 13 (2), pp.024015. ⟨10.1103/physrevapplied.13.024015⟩. ⟨hal-04137621⟩

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