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A first-pass learning sequence for new members studying superconducting digital circuits.

👤 new-member ⏱ 10 min🔧 draft🌐 public
#onboarding #reading #fundamentals
Owner: wiki-leadUpdated: 2026-04-24Review due: 2026-10

Reading Path

Use this path during your first two weeks. The goal is not to become an expert immediately; it is to build enough shared vocabulary that meetings, papers, and tool discussions start to make sense.

Phase 1: First Pass

Read these pages in order:

DayPageOutput
1Superconducting Logic OverviewOne paragraph: why superconducting logic is studied
2Superconductivity BasicsHand-drawn ring showing flux quantization
3Josephson Effect and JJDerive Vdt=Φ0 from the AC Josephson relation
4SQUID BasicsSketch a double-well potential and explain bias
5SFQ BasicsExplain how one SFQ pulse propagates between stages
6AQFP BasicsCompare SFQ and AQFP in a short table

Phase 2: Explain Back

After the first pass, prepare a 5-minute explanation for another new member:

  • Why does CMOS face an energy/interconnect problem?
  • What is a flux quantum?
  • What does a Josephson junction do?
  • Why does SFQ use pulses?
  • Why can AQFP reduce switching energy?

Keep the explanation simple. If you need more than one equation per concept, you probably have not simplified it enough yet.

Phase 3: Connect to Lab Work

Once the basics are comfortable, continue based on your project:

If Your Work Is AboutRead Next
Logic circuitsSFQ vs AQFP, Logic Design
LayoutDesign Constraints, Layout
SimulationSimulation, JoSIM Quick Start
MeasurementMeasurement Overview, IV Measurement
ToolsTools Overview, Git and Repositories

Self-Check

You are ready for project-specific reading when you can answer these without notes:

  • What physical quantity is quantized in SFQ circuits?
  • Why does a 2π phase change matter?
  • What role does bias current or bias flux play?
  • Why is damping important for Josephson junction switching?
  • What is the energy tradeoff between SFQ and AQFP?

If any answer feels fuzzy, go back to the corresponding fundamentals page and redo the training exercise.

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