Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays

• URL: http://arxiv.org/abs/1909.08037v3
• Date: Fri, 27 Oct 2023 13:24:25 GMT
• Title: Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays
• Authors: Patrick Winkel, Ivan Takmakov, Dennis Rieger, Luca Planat, Wiebke Hasch-Guichard, Lukas Gr\"unhaupt, Nataliya Maleeva, Farshad Foroughi, Fabio Henriques, Kiril Borisov, Julian Ferrero, Alexey V. Ustinov, Wolfgang Wernsdorfer, Nicolas Roch, Ioan M. Pop
• Abstract summary: We show the continuous detection of quantum jumps of a transmon qubit with 90% fidelity in state discrimination. A single amplifier device could potentially cover the entire frequency band between 1 and $10mathrmGHz$.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Determining the state of a qubit on a timescale much shorter than its relaxation time is an essential requirement for quantum information processing. With the aid of a new type of non-degenerate parametric amplifier, we demonstrate the continuous detection of quantum jumps of a transmon qubit with 90% fidelity in state discrimination. Entirely fabricated with 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 at multiple eigenmodes with frequencies below $10~\mathrm{GHz}$, which is the typical range for qubit readout. Moreover, by introducing a moderate flux tunability of each mode, employing superconducting quantum interference device (SQUID) junctions, a single amplifier device could potentially cover the entire frequency band between 1 and $10~\mathrm{GHz}$.

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