feat(profiles): add IQMEmerald() — Crystal 54 full device profile by kateebonner · Pull Request #26 · harmoniqs/Legato.jl

kateebonner · 2026-06-09T20:04:29Z

Summary

Adds IQMEmerald(), a TransmonDevice profile for the full 54-qubit IQM Emerald Crystal 54 QPU
Includes all 83 connected pairs from the Crystal 54 topology with real CZ fidelities from IRB calibration
Coherence times (T1, T2 Ramsey) and PRX fidelities are real values from the 2026-06-09 calibration snapshot
Qubit frequencies and coupling strengths are estimated from arXiv:2603.11018 (to be updated from Pulla calibration stash once pulse-level access is available)
QB46 is flagged as non-functional (PRX error 11.4%, T2 missing) but included for index consistency
All 89 existing tests pass locally

🤖 Generated with Claude Code

kateebonner · 2026-06-10T14:21:54Z

I imagine it may be best to split this file up so we have: 1 file per device profile, all living in a "profiles" folder

jack-champagne

Looks good! The other data besides the TransmonQubit constructor I think we could have as a tabular file - maybe something like: iqm_emerald_2026-06-09.toml with a loader here that extracts the T1, T2, per-qubit PRX err, topology + per-edge CZ err`. That way we're updating that file instead of this one when recalibration data updates our numbers here (and we can backtest on old cal data easily).

Just a few nits otherwise!

jack-champagne · 2026-06-15T20:34:08Z

+        11.20,
+        32.53,
+        11.56,
+        0.00,


might be a bit dangerous to be setting t2 as 0.0 - let's set as NaN so that this blows up noisily!

jack-champagne · 2026-06-15T20:41:45Z

+    qubits = [
+        TransmonQubit(4.20, 0.180, 3),  # QB1   T1=46.4  T2=17.9  PRX_err=3.01e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB2   T1=24.9  T2=18.0  PRX_err=3.75e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB3   T1=42.4  T2=48.0  PRX_err=3.00e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB4   T1=39.8  T2=12.3  PRX_err=5.53e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB5   T1=37.5  T2=21.9  PRX_err=7.13e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB6   T1=56.5  T2=13.0  PRX_err=2.90e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB7   T1=66.0  T2=19.9  PRX_err=5.84e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB8   T1=36.9  T2=33.4  PRX_err=9.16e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB9   T1=47.2  T2=4.3   PRX_err=4.49e-03
+        TransmonQubit(4.40, 0.180, 3),  # QB10  T1=50.4  T2=52.1  PRX_err=3.56e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB11  T1=20.9  T2=12.2  PRX_err=5.51e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB12  T1=61.2  T2=18.1  PRX_err=2.06e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB13  T1=32.3  T2=11.7  PRX_err=1.09e-03
+        TransmonQubit(4.40, 0.180, 3),  # QB14  T1=45.3  T2=14.4  PRX_err=9.24e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB15  T1=32.3  T2=21.0  PRX_err=6.02e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB16  T1=55.7  T2=9.0   PRX_err=4.29e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB17  T1=46.8  T2=13.7  PRX_err=6.57e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB18  T1=57.1  T2=17.7  PRX_err=4.29e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB19  T1=54.1  T2=30.3  PRX_err=5.40e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB20  T1=66.1  T2=14.3  PRX_err=2.20e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB21  T1=50.5  T2=8.2   PRX_err=3.84e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB22  T1=56.0  T2=13.2  PRX_err=3.32e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB23  T1=60.4  T2=26.4  PRX_err=2.48e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB24  T1=62.1  T2=18.0  PRX_err=9.57e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB25  T1=46.3  T2=19.3  PRX_err=2.88e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB26  T1=49.4  T2=9.2   PRX_err=6.76e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB27  T1=49.0  T2=11.6  PRX_err=3.10e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB28  T1=50.0  T2=8.4   PRX_err=2.70e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB29  T1=48.0  T2=12.4  PRX_err=3.65e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB30  T1=58.1  T2=49.4  PRX_err=8.89e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB31  T1=48.9  T2=14.4  PRX_err=3.56e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB32  T1=33.6  T2=14.9  PRX_err=5.30e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB33  T1=50.0  T2=7.3   PRX_err=4.65e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB34  T1=64.5  T2=9.2   PRX_err=3.49e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB35  T1=39.0  T2=13.0  PRX_err=5.73e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB36  T1=55.7  T2=8.4   PRX_err=2.92e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB37  T1=54.8  T2=16.7  PRX_err=3.05e-03
+        TransmonQubit(4.40, 0.180, 3),  # QB38  T1=64.7  T2=10.2  PRX_err=3.51e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB39  T1=64.1  T2=33.3  PRX_err=3.05e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB40  T1=51.2  T2=15.0  PRX_err=3.59e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB41  T1=45.6  T2=2.5   PRX_err=3.86e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB42  T1=37.9  T2=15.3  PRX_err=9.51e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB43  T1=40.5  T2=11.2  PRX_err=3.44e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB44  T1=65.3  T2=32.5  PRX_err=1.13e-03
+        TransmonQubit(4.20, 0.180, 3),  # QB45  T1=43.5  T2=11.6  PRX_err=3.32e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB46  T1=51.9  T2=0.0   PRX_err=1.14e-01  ← broken
+        TransmonQubit(4.20, 0.180, 3),  # QB47  T1=19.5  T2=12.7  PRX_err=5.12e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB48  T1=65.3  T2=6.1   PRX_err=2.72e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB49  T1=75.4  T2=16.5  PRX_err=1.91e-03
+        TransmonQubit(4.40, 0.180, 3),  # QB50  T1=54.6  T2=50.5  PRX_err=2.58e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB51  T1=50.9  T2=27.6  PRX_err=6.58e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB52  T1=58.2  T2=21.7  PRX_err=3.57e-04
+        TransmonQubit(4.20, 0.180, 3),  # QB53  T1=55.7  T2=18.2  PRX_err=2.10e-04
+        TransmonQubit(4.40, 0.180, 3),  # QB54  T1=47.7  T2=14.5  PRX_err=3.40e-04
+    ]


We can replace most of this with a list comprehension (minus the comments, but those are duplicated down below).

Suggested change

qubits = [

TransmonQubit(4.20, 0.180, 3), # QB1 T1=46.4 T2=17.9 PRX_err=3.01e-04

TransmonQubit(4.40, 0.180, 3), # QB2 T1=24.9 T2=18.0 PRX_err=3.75e-04

TransmonQubit(4.20, 0.180, 3), # QB3 T1=42.4 T2=48.0 PRX_err=3.00e-04

TransmonQubit(4.40, 0.180, 3), # QB4 T1=39.8 T2=12.3 PRX_err=5.53e-04

TransmonQubit(4.20, 0.180, 3), # QB5 T1=37.5 T2=21.9 PRX_err=7.13e-04

TransmonQubit(4.40, 0.180, 3), # QB6 T1=56.5 T2=13.0 PRX_err=2.90e-04

TransmonQubit(4.20, 0.180, 3), # QB7 T1=66.0 T2=19.9 PRX_err=5.84e-04

TransmonQubit(4.40, 0.180, 3), # QB8 T1=36.9 T2=33.4 PRX_err=9.16e-04

TransmonQubit(4.20, 0.180, 3), # QB9 T1=47.2 T2=4.3 PRX_err=4.49e-03

TransmonQubit(4.40, 0.180, 3), # QB10 T1=50.4 T2=52.1 PRX_err=3.56e-04

TransmonQubit(4.20, 0.180, 3), # QB11 T1=20.9 T2=12.2 PRX_err=5.51e-04

TransmonQubit(4.40, 0.180, 3), # QB12 T1=61.2 T2=18.1 PRX_err=2.06e-04

TransmonQubit(4.20, 0.180, 3), # QB13 T1=32.3 T2=11.7 PRX_err=1.09e-03

TransmonQubit(4.40, 0.180, 3), # QB14 T1=45.3 T2=14.4 PRX_err=9.24e-04

TransmonQubit(4.20, 0.180, 3), # QB15 T1=32.3 T2=21.0 PRX_err=6.02e-04

TransmonQubit(4.40, 0.180, 3), # QB16 T1=55.7 T2=9.0 PRX_err=4.29e-04

TransmonQubit(4.20, 0.180, 3), # QB17 T1=46.8 T2=13.7 PRX_err=6.57e-04

TransmonQubit(4.40, 0.180, 3), # QB18 T1=57.1 T2=17.7 PRX_err=4.29e-04

TransmonQubit(4.20, 0.180, 3), # QB19 T1=54.1 T2=30.3 PRX_err=5.40e-04

TransmonQubit(4.40, 0.180, 3), # QB20 T1=66.1 T2=14.3 PRX_err=2.20e-04

TransmonQubit(4.20, 0.180, 3), # QB21 T1=50.5 T2=8.2 PRX_err=3.84e-04

TransmonQubit(4.40, 0.180, 3), # QB22 T1=56.0 T2=13.2 PRX_err=3.32e-04

TransmonQubit(4.20, 0.180, 3), # QB23 T1=60.4 T2=26.4 PRX_err=2.48e-04

TransmonQubit(4.40, 0.180, 3), # QB24 T1=62.1 T2=18.0 PRX_err=9.57e-04

TransmonQubit(4.20, 0.180, 3), # QB25 T1=46.3 T2=19.3 PRX_err=2.88e-04

TransmonQubit(4.40, 0.180, 3), # QB26 T1=49.4 T2=9.2 PRX_err=6.76e-04

TransmonQubit(4.20, 0.180, 3), # QB27 T1=49.0 T2=11.6 PRX_err=3.10e-04

TransmonQubit(4.40, 0.180, 3), # QB28 T1=50.0 T2=8.4 PRX_err=2.70e-04

TransmonQubit(4.20, 0.180, 3), # QB29 T1=48.0 T2=12.4 PRX_err=3.65e-04

TransmonQubit(4.40, 0.180, 3), # QB30 T1=58.1 T2=49.4 PRX_err=8.89e-04

TransmonQubit(4.20, 0.180, 3), # QB31 T1=48.9 T2=14.4 PRX_err=3.56e-04

TransmonQubit(4.40, 0.180, 3), # QB32 T1=33.6 T2=14.9 PRX_err=5.30e-04

TransmonQubit(4.20, 0.180, 3), # QB33 T1=50.0 T2=7.3 PRX_err=4.65e-04

TransmonQubit(4.40, 0.180, 3), # QB34 T1=64.5 T2=9.2 PRX_err=3.49e-04

TransmonQubit(4.20, 0.180, 3), # QB35 T1=39.0 T2=13.0 PRX_err=5.73e-04

TransmonQubit(4.40, 0.180, 3), # QB36 T1=55.7 T2=8.4 PRX_err=2.92e-04

TransmonQubit(4.20, 0.180, 3), # QB37 T1=54.8 T2=16.7 PRX_err=3.05e-03

TransmonQubit(4.40, 0.180, 3), # QB38 T1=64.7 T2=10.2 PRX_err=3.51e-04

TransmonQubit(4.20, 0.180, 3), # QB39 T1=64.1 T2=33.3 PRX_err=3.05e-04

TransmonQubit(4.40, 0.180, 3), # QB40 T1=51.2 T2=15.0 PRX_err=3.59e-04

TransmonQubit(4.20, 0.180, 3), # QB41 T1=45.6 T2=2.5 PRX_err=3.86e-04

TransmonQubit(4.40, 0.180, 3), # QB42 T1=37.9 T2=15.3 PRX_err=9.51e-04

TransmonQubit(4.20, 0.180, 3), # QB43 T1=40.5 T2=11.2 PRX_err=3.44e-04

TransmonQubit(4.40, 0.180, 3), # QB44 T1=65.3 T2=32.5 PRX_err=1.13e-03

TransmonQubit(4.20, 0.180, 3), # QB45 T1=43.5 T2=11.6 PRX_err=3.32e-04

TransmonQubit(4.40, 0.180, 3), # QB46 T1=51.9 T2=0.0 PRX_err=1.14e-01 ← broken

TransmonQubit(4.20, 0.180, 3), # QB47 T1=19.5 T2=12.7 PRX_err=5.12e-04

TransmonQubit(4.40, 0.180, 3), # QB48 T1=65.3 T2=6.1 PRX_err=2.72e-04

TransmonQubit(4.20, 0.180, 3), # QB49 T1=75.4 T2=16.5 PRX_err=1.91e-03

TransmonQubit(4.40, 0.180, 3), # QB50 T1=54.6 T2=50.5 PRX_err=2.58e-04

TransmonQubit(4.20, 0.180, 3), # QB51 T1=50.9 T2=27.6 PRX_err=6.58e-04

TransmonQubit(4.40, 0.180, 3), # QB52 T1=58.2 T2=21.7 PRX_err=3.57e-04

TransmonQubit(4.20, 0.180, 3), # QB53 T1=55.7 T2=18.2 PRX_err=2.10e-04

TransmonQubit(4.40, 0.180, 3), # QB54 T1=47.7 T2=14.5 PRX_err=3.40e-04

]

qubits = [TransmonQubit(isodd(i) ? 4.20 : 4.40, 0.180, 3) for i in 1:54]

The other data I think we could have as a tabular file - maybe something like: iqm_emerald_2026-06-09.toml with a loader here that extracts the T1, T2, per-qubit PRX err, topology + per-edge CZ err`

Adds IQMEmerald(), a TransmonDevice profile for the full 54-qubit IQM Emerald Crystal 54 QPU. All calibration data lives in src/data/iqm_emerald_2026-06-09.toml — IQMEmerald() is pure construction logic; recalibration = update the data file only. - All 83 connected pairs from Crystal 54 topology with CZ fidelities from IRB calibration - T1, T2 Ramsey, and PRX fidelities from 2026-06-09 calibration snapshot - Qubit frequencies and coupling strengths estimated from arXiv:2603.11018 - QB46 non-functional: T2 = NaN so arithmetic on this qubit fails loudly - Native gate specs (PRX 20 ns, CZ 40 ns) loaded from TOML Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

jack-champagne · 2026-06-17T03:51:07Z

Awesome! Thanks @kateebonner 🎉

kateebonner force-pushed the feat/iqm-emerald-profile branch 2 times, most recently from 0086cb2 to 3e10b32 Compare June 9, 2026 21:15

kateebonner requested review from aarontrowbridge and jack-champagne June 9, 2026 21:20

kateebonner force-pushed the feat/iqm-emerald-profile branch from f50c274 to 2b7c185 Compare June 10, 2026 15:41

jack-champagne reviewed Jun 15, 2026

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kateebonner force-pushed the feat/iqm-emerald-profile branch from 2125c9d to d838e5f Compare June 16, 2026 13:17

kateebonner requested review from jack-champagne and removed request for aarontrowbridge June 16, 2026 13:20

jack-champagne merged commit 40490ad into main Jun 17, 2026
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jack-champagne mentioned this pull request Jun 18, 2026

Add HeronR2 device profile #29

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feat(profiles): add IQMEmerald() — Crystal 54 full device profile#26

feat(profiles): add IQMEmerald() — Crystal 54 full device profile#26
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