Measured operating envelope on IBM Fez. Public job IDs. Raw Sampler counts.
Result. QPC ran a width-and-depth ladder on ibm_fez from 16 to 128 qubits. Under the standard envelope every published point is Exec PASS and Quality PASS, including 128 qubits, nine cycles, compiled depth 1922, job d724aj9amkec73a0ob60.
Quality line we enforce. A second, stricter compiled-depth line sits at 1000 layers. At 128 qubits, Cyc=1–5 sit inside that line. Cyc=6–9 sit above it (depths 1036–1922). Those jobs still returned full bitstring counts. The line marks the IBM depth regime we use for structured readout.
Where this sits now. This page is the Fez envelope campaign. Later QPC desks run at 156 qubits on ibm_kingston and ibm_marrakesh. See Real-World Desks.
Each point is a QPC-style job on Fez, labelled by four numbers:
Exec PASS means IBM returned usable measurement counts. Quality PASS means those counts clear the standard envelope: mean pairwise correlation, outcome diversity, top-outcome share, and compiled depth (standard cap 2200).
Backend: IBM Quantum ibm_fez (Heron r2). Typically 1024 shots per point. Metrics on this page are raw Sampler counts.
Full ladder: 16Q–128Q, contexture and transjunction sweeps, 128Q cycle ladder to Cyc=9, 128Q transjunction T=2–4. Every published point on that ladder is Exec PASS and Quality PASS under the standard envelope. The table shows the width steps plus the deep 128Q end.
| Q | K | T | Cyc | Exec | Quality | Depth | 2Q gates | Job ID |
|---|---|---|---|---|---|---|---|---|
| 16 | 2 | 1 | 1 | PASS | PASS | 20 | 16 | d71v53mqdfbc73d1fafg |
| 32 | 8 | 1 | 1 | PASS | PASS | 108 | 98 | d723gspamkec73a0ndtg |
| 64 | 2 | 1 | 1 | PASS | PASS | 40 | 64 | d72325eqdfbc73d1krj0 |
| 96 | 2 | 1 | 1 | PASS | PASS | 56 | 96 | d723m1hamkec73a0njbg |
| 128 | 2 | 1 | 1 | PASS | PASS | 527 | 476 | d723ntev3u3c73ei4260 |
| 128 | 2 | 1 | 5 | PASS | PASS | 715 | 2386 | d723qppamkec73a0noa0 |
| 128 | 2 | 1 | 9 | PASS | PASS | 1922 | 4503 | d724aj9amkec73a0ob60 |
| 128 | 2 | 4 | 1 | PASS | PASS | 450 | 452 | d72456ev3u3c73ei4gk0 |
We also score the same 128Q cycle jobs against a stricter compiled-depth line of 1000 layers. That is an engineering gate on IBM transpiled depth. The jobs below are the same Fez runs as the envelope table. Exec stays PASS on every row.
| Q | K | T | Cyc | Exec | Depth | 1000-layer line |
|---|---|---|---|---|---|---|
| 128 | 2 | 1 | 1 | PASS | 527 | inside |
| 128 | 2 | 1 | 5 | PASS | 715 | inside |
| 128 | 2 | 1 | 6 | PASS | 1283 | above |
| 128 | 2 | 1 | 9 | PASS | 1922 | above |
Cyc=2–4 and Cyc=7–8 follow the same split: Cyc=2–5 inside the line, Cyc=6–9 above it. Standard-envelope Quality PASS holds on all of these rows (depth cap 2200).
QPC delivered a full Fez operating range, 16 to 128 qubits, with auditable IBM job IDs and a quality line we publish in advance. The 1000-layer gate tells a reader when compiled depth has entered the IBM noise-and-depth regime we flag for structured interpretation. Later architecture desks on Heron r2 at 156 qubits are the current width of the QPC record: mask synthesis on ibm_kingston, ADMET on ibm_marrakesh.