958 lines
80 KiB
Text
958 lines
80 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<h1 class="nist-page__title">VHF Josephson Arbitrary Waveform Synthesizer</h1>
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<div class="nist-field__label">Published</div>
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<div class="nist-field__item"><time datetime="2024-10-01T12:00:00Z">October 1, 2024</time>
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<div class="nist-field__item"><span class="nist-author">Jeremy Thomas</span>, <span class="nist-author">Nathan Flowers-Jacobs</span>, <span class="nist-author">Anna Fox</span>, Akim Babenko, <span class="nist-author">Samuel Benz</span>, <span class="nist-author">Paul Dresselhaus</span></div>
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<h3>Abstract</h3>
|
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We report on the design, fabrication, and measurement of a Very High Frequency band Josephson Arbitrary Waveform Synthesizer (VHF-JAWS) at frequencies up to 50.05 MHz. The VHF-JAWS chip is composed of a series array of 12810 Josephson junctions (JJs) embedded in a superconducting coplanar waveguide. Each JJ responds to a pattern of current pulses by creating a corresponding pattern of voltage pulses each with a time-integrated area h/2e. The pulse patterns are chosen to produce quantum-based single-tone voltage waveforms with an open-circuit voltage of 50 mV rms (-19.03 dBm output power into 50 Ω load impedances) at frequencies up to 50.05 MHz, which is more than twice the voltage that has been generated by previous RF-JAWS designs at 1 GHz. The VHF-JAWS is "quantum-locked", that is, it generates one quantized output voltage pulse per input current pulse per JJ, while varying the dc-current through the JJ array by at least 0.7 mA and the amplitude of the bias pulses by at least 10%. We use the large bias pulse quantum-locked range to investigate in detail one source of error: the direct feedthrough of the current bias pulses into the DUT at VHF frequencies. We reduce this error by high-pass filtering the current bias pulses and measure the error as a function of input pulse-amplitude in two regimes: over the quantum-locked range and after passively attenuating the input pulse-amplitude so that the JJs no longer generate voltage pulses.
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<div class="nist-field__item">IEEE Transactions on Applied Superconductivity</div>
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<div class="nist-field__label">Volume</div>
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<div class="nist-field__item">34</div>
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<div class="nist-field__item"><a href="https://doi.org/10.1109/TASC.2024.3418332" target="_blank">https://doi.org/10.1109/TASC.2024.3418332</a></div>
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<h3 class="nist-field__label">Keywords</h3>
|
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<div class="nist-field__item">Josephson junction arrays, digital-analog conversion, signal synthesis, superconducting integrated circuits, superconducting microwave devices, power measurement standards</div>
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<article class="bibcite-reference">
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<div class="bibcite-citation">
|
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Thomas, J.
|
||
, Flowers-Jacobs, N.
|
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, Fox, A.
|
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, Babenko, A.
|
||
, Benz, S.
|
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and Dresselhaus, P.
|
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|
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(2024),
|
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VHF Josephson Arbitrary Waveform Synthesizer, IEEE Transactions on Applied Superconductivity, [online], https://doi.org/10.1109/TASC.2024.3418332, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957323
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Created October 1, 2024, Updated October 31, 2024
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