RSFQ Windowed Encoding Lab

Logic 1 = an SFQ pulse present in the agreed clock window. Logic 0 = absence in that same window. A physically fine pulse in the wrong window is a timing error — not a free 1.

Enable timing skew (pulse outside window)

Epochs

Decoded 1s

Decoded 0s

Timing errors

Error rate

Latest batch — clock windows (shaded) vs data pulses (dots)

Epoch	Intended bit	Pulse landing	Decoded bit	Status
Click “Generate 8 epochs” to run a short bitstream.

Without skew: every intended 1 lands in-window; every intended 0 stays empty → 0% timing errors. With skew: some pulses arrive early/late. The receiver still looks only inside the window, so the decoded bit can disagree with Alice’s intent — the RSFQ analogue of “wrong basis / wrong epoch.”