Nondegenerate Parametric Amplifiers Based on Dispersion-Engineered Josephson-Junction Arrays
Patrick Winkel, Ivan Takmakov, Dennis Rieger, Luca Planat, Wiebke Hasch-Guichard, Lukas Grünhaupt, Nataliya Maleeva, Farshad Foroughi, Fabio Henriques, Kiril Borisov, Julian Ferrero, Alexey V. Ustinov, Wolfgang Wernsdorfer, Nicolas Roch, Ioan M. Pop
DOI 10.1103/PhysRevApplied.13.024015 · Physical Review Applied
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Abstract
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 103JJs, we can obtain amplification in multiple eigenmodes with frequencies below 10GHz, 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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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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