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Rapid single flux quantum — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Rapid_single_flux_quantum
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T18:21:18.998Z
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Rapid single flux quantum — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Rapid_single_flux_quantum (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_c49aaa41422d (Metraipolis archive dc_c49aaa41422d, sha256 524f57e4dcdd58f0e7af3d5a3f4241c39c37691540a9cdec5b3a0c973c6e395a)

BibTeX

@misc{dcc49aaa41422d,
  title = {Rapid single flux quantum — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Rapid_single_flux_quantum},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_c49aaa41422d; sha256 524f57e4dcdd58f0e7af3d5a3f4241c39c37691540a9cdec5b3a0c973c6e395a},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Rapid_single_flux_quantum. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In electronics, rapid single flux quantum (RSFQ) is a digital electronic device that uses superconducting devices, namely Josephson junctions, to process digital signals. In RSFQ logic, information is stored in the form of magnetic flux quanta and transferred in the form of single flux quantum (SFQ) voltage pulses. RSFQ is one family of superconducting or SFQ logic. Others include reciprocal quantum logic (RQL), ERSFQ – energy-efficient RSFQ version that does not use bias resistors, etc. Josephson junctions are the active elements for RSFQ electronics, just as transistors are the active elements for semiconductor electronics. RSFQ is a classical digital, not quantum computing, technology. RSFQ is very different from the CMOS transistor technology used in conventional computers: Superconducting devices require cryogenic temperatures. picosecond-duration SFQ voltage pulses produced by Josephson junctions are used to encode, process, and transport digital information instead of the voltage levels produced by transistors in semiconductor electronics. SFQ voltage pulses travel on superconducting transmission lines which have very small, and usually negligible, dispersion if no spectral component of the pulse is above the frequency of the energy gap of the superconductor. In the case of SFQ pulses of 1 ps, it is possible to clock the circuits at frequencies of the order of 100 GHz (one pulse every 10 picoseconds). An SFQ pulse is produced when magnetic flux through a superconducting loop containing a Josephson junction changes by one flux quantum, Φ0 as a result of the junction switching. SFQ pulses have a quantized area ʃV(t)dt = Φ0 ≈ 2.07×10−15 Wb = 2.07 mV⋅ps = 2.07 mA⋅pH due to magnetic flux quantization, a fundamental property of superconductors. Depending on the parameters of the Josephson junctions, the pulses can be as narrow as 1 ps with an amplitude of about 2 mV, or broader (e.g., 5–10 ps) with correspondingly lower amplitude. The typical value of the pulse amplitude is approximately 2IcRn, where IcRn is the product of the junction critical current, Ic, and the junction damping resistor, Rn. For Nb-based junction technology IcRn is on the order of 1 mV.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «quantum computing»).
Fonte: Wikipedia in inglese, voce «Rapid single flux quantum» — https://en.wikipedia.org/wiki/Rapid_single_flux_quantum
Wikidata Q7294230: «digital electronic device that uses superconducting devices» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q7294230
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Rapid_single_flux_quantum?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1355173504, consultata il 2026-11-07T18:14:12.545Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 83391a7151a10700ac737ae221984399b7ca0f6c0fce3113060f0e8476bc1d2c