Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays
| Autor: | Nicolas Roch, Julian Ferrero, Wiebke Hasch-Guichard, Fabio Henriques, Dennis Rieger, Ioan Pop, Alexey V. Ustinov, Ivan Takmakov, Nataliya Maleeva, Wolfgang Wernsdorfer, Lukas Grünhaupt, Patrick Winkel, Kiril Borisov, Farshad Foroughi, Luca Planat |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Josephson effect
Physics Quantum Physics Frequency band Amplifier Condensed Matter - Superconductivity FOS: Physical sciences General Physics and Astronomy 02 engineering and technology Transmon Type (model theory) 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Cover (topology) Quantum mechanics Qubit 0103 physical sciences Parametric oscillator Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology |
| Popis: | 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 $10~\mathrm{GHz}$. P.W. and I.T. contributed equally. 9 pages, 5 figures and appendices |
| Databáze: | OpenAIRE |
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