--- title: Will Superconducting Transistors Help Quantum Computers? description: A startup called S-Transistors is developing superconducting transistors based on Josephson junctions that can operate at near-absolute-zero temperatures,... canonical: https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Will Superconducting Transistors Help Quantum Computers? | daily.dev og:description: A startup called S-Transistors is developing superconducting transistors based on Josephson junctions that can operate at near-absolute-zero temperatures,... og:url: https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y og:image: https://api.daily.dev/og/posts/7DYYIYC3y.png og:image:alt: Will Superconducting Transistors Help Quantum Computers? og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Will Superconducting Transistors Help Quantum Computers? **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A startup called S-Transistors is developing superconducting transistors based on Josephson junctions that can operate at near-absolute-zero temperatures, aiming to place control circuitry inside the same cryostat as qubits, eliminating failure-prone wiring that must penetrate cryogenic chambers. Their JJ-based field effect transistors (JJFETs), described in a 2025 paper, are claimed to now be manufacturable at scale. This approach would compete with cryogenic CMOS (Cry-CMOS), which uses existing semiconductor fabrication lines but cannot reach the same near-zero Kelvin performance. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What are superconducting transistors and how could they help quantum computers? Superconducting transistors, developed by a startup called S-Transistors, use Josephson junctions driven with enough current to briefly become non-superconducting, producing a detectable voltage pulse that acts as a transistor signal. Because they work at near-absolute-zero temperatures, they could sit inside the same cryostat as qubits, removing the dense wiring that must otherwise penetrate the cryostat to reach room-temperature control electronics. _Developers tracking quantum hardware progress can follow deep dives like this on daily.dev._ ### How do superconducting JJFETs compare to cryogenic CMOS for quantum computer control electronics? JJFETs (Josephson junction field effect transistors) can operate at near-zero Kelvin, colder than cryogenic CMOS (Cry-CMOS) can tolerate, making them better suited to sit alongside qubits inside the cryostat. Cry-CMOS has the advantage of using existing standard semiconductor production lines, while JJFETs require new manufacturing approaches that a 2025 paper by Yusheng Xiong et al. claims can now be scaled. _Anyone weighing emerging quantum hardware approaches can compare notes on daily.dev._ ## Similar posts on daily.dev - [Wafer-Scale Superconducting Transistors Cut Cryo Cables](https://daily.dev/posts/wafer-scale-superconducting-transistors-cut-cryo-cables-s2dofrndm) · IEEE Spectrum · 0 upvotes · 0 comments - [S-Transistors Raises €2.6 Million Pre-Seed Round to Introduce Superconducting Transistor Platform](https://daily.dev/posts/s-transistors-raises-2-6-million-pre-seed-round-to-introduce-superconducting-transistor-platform-d0thf3ahe) · The Quantum Insider · 0 upvotes · 0 comments - [A Quantum Components Industry Is Emerging](https://daily.dev/posts/a-quantum-components-industry-is-emerging-0b5tgehgk) · IEEE Spectrum · 2 upvotes · 0 comments - [From Cryo to Cryoless: The Evolution of Quantum Computing](https://daily.dev/posts/from-cryo-to-cryoless-the-evolution-of-quantum-computing-0w1ycbm6c) · Medium · 0 upvotes · 0 comments - [How quantum computers can aid the search for room-temperature superconductors](https://daily.dev/posts/how-quantum-computers-can-aid-the-search-for-room-temperature-superconductors-yvchbh2xg) · Phys.org · 0 upvotes · 0 comments --- Tags: [#quantum-computing](https://daily.dev/tags/quantum-computing) [View this post on daily.dev](https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Will Superconducting Transistors Help Quantum Computers?","url":"https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y"},"datePublished":"2026-10-01T02:29:27.884Z","dateModified":"2026-10-01T02:29:48.842Z","description":"A startup called S-Transistors is developing superconducting transistors based on Josephson junctions that can operate at near-absolute-zero temperatures,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/981438e19cdbfd24c5013f239737fe69?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/981438e19cdbfd24c5013f239737fe69?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"quantum-computing","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"Will Superconducting Transistors Help Quantum Computers?"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/will-superconducting-transistors-help-quantum-computers--7dyyiyc3y#faq","mainEntity":[{"@type":"Question","name":"What are superconducting transistors and how could they help quantum computers?","acceptedAnswer":{"@type":"Answer","text":"Superconducting transistors, developed by a startup called S-Transistors, use Josephson junctions driven with enough current to briefly become non-superconducting, producing a detectable voltage pulse that acts as a transistor signal. Because they work at near-absolute-zero temperatures, they could sit inside the same cryostat as qubits, removing the dense wiring that must otherwise penetrate the cryostat to reach room-temperature control electronics. Developers tracking quantum hardware progress can follow deep dives like this on daily.dev."}},{"@type":"Question","name":"How do superconducting JJFETs compare to cryogenic CMOS for quantum computer control electronics?","acceptedAnswer":{"@type":"Answer","text":"JJFETs (Josephson junction field effect transistors) can operate at near-zero Kelvin, colder than cryogenic CMOS (Cry-CMOS) can tolerate, making them better suited to sit alongside qubits inside the cryostat. Cry-CMOS has the advantage of using existing standard semiconductor production lines, while JJFETs require new manufacturing approaches that a 2025 paper by Yusheng Xiong et al. claims can now be scaled. Anyone weighing emerging quantum hardware approaches can compare notes on daily.dev."}}]} ```