Strumento.jl

The Julia face of the strumento QICK tProc-v2 experiment framework — the standalone substrate layer (the soc registry: real/mock/twin boards).

Renamed from IntonatoQICK.jl on Jul 23, 2026 (the old repo is archived). The package's job narrowed to "hand a solved pulse to strumento, get measurements back," so the name follows: it is the Julia binding to strumento, not an Intonato-specific QICK translator. Since v0.2 (issue #14) the dependency edge is inverted: this package stands alone on Piccolo and no longer depends on or reexports Intonato — the closed-loop seam (StrumentoBackend / StrumentoExperiment) relocated to Intonato (≥ its next release, which depends on this package). Since the weakdeps split (issue #16), Piccolo and PythonCall are package extensions (weakdeps): the base package is the light contract surface (the soc abstraction, the channel map, readout conversion, the QickProgram translation record, the twin core) and carries neither the physics stack nor the Python bridge. Every function verb on today's surface stays base-declared and dispatches to the extension's typed methods when the trigger loads; the extension-defined types (MockSoc, StrumentoSoc) are reached through Base.get_extension (extension exports do not surface on the parent module). Consumers that never load the trigger deps get the light package by construction.

One source of truth (why a face, not a port)

The device model, the pulse IR, the compiler, and AveragerProgramV2 assembly all live in the Python strumento package. Strumento.jl is a binding, not a reimplementation — there is one authority for the pulse to program to acquire path, in Python, and two idiomatic front doors (Python and Julia) onto it. On a real board, Julia never assembles a program: it hands the solved pulse to strumento.from_solution over PythonCall and reads measurements back.

What it provides

• AbstractSoc and its verbs (execute!, dac_rate, adc_rate) — the board-controller abstraction every soc implements.
• MockSoc (the Piccolo extension — reached via Base.get_extension(Strumento, :StrumentoPiccoloExt)) — a pure-Julia "board" that translates the pulse in Julia and rolls it through a known QuantumSystem (Piccolo-native propagation), emitting synthetic IQ. The mock path runs and is tested with no Python and no hardware.
• StrumentoSoc (the PythonCall extension — reached via Base.get_extension(Strumento, :StrumentoPythonCallExt)) — the real board, reached by delegating to Python strumento over PythonCall (lazy import; only on a board). execute! hands the pulse to from_solution then StrumentoProgram then acquire then reduce; the exact device wiring / drive-map / reduce conventions are finalized with the QICK collaboration on hardware.
• QickChannelMap (device policy the mock uses: drive to gen-channel/carrier/IQ), pulse_to_envelopes (pulse → QICK-shaped envelopes, with the 16,384-sample envelope-memory cap — base-declared verb; the AbstractPulse method rides the Piccolo extension), and iq_to_measurements (IQ blob → Measurement via a caller-supplied discriminator) — the substrate-side translation and readout surface.
• Digital twins (absorbed from Sosia.jl, vault spec-20260803-043304) — the twin core: drift processes (OrnsteinUhlenbeck with the exact Gaussian transition, Ramp, RandomTelegraph, JumpSchedule, composed per parameter via DriftPlan), the vault twin-record loader (load_record → TwinRecord; records are vault documents — code loads records, it never owns parameters), and the DigitalTwin truth/belief/record contract (instantiate, believed, advance!, calibrate! — drift moves truth only, calibration moves belief only). Seeded replay is bit-exact: a calibration failure reproduces exactly.

using Strumento

twin = instantiate("model-of-lab/stanford-bosonic.md";
                   drift = DriftPlan(:chi_kHz => [OrnsteinUhlenbeck(theta = 0.07, sigma = 3.0, mu = -300.0)]),
                   seed = 0xC0FFEE)
advance!(twin, 1.0)     # drift the truth one day (belief untouched)
believed(twin)          # what calibration currently knows
calibrate!(twin, Dict("chi_kHz" => twin.truth[:chi_kHz]))   # write-back (truth untouched)

The division of labour

Intonato (Julia)   ->  QILC chassis + StrumentoBackend / StrumentoExperiment  (the loop)
  Strumento.jl     ->  AbstractSoc registry: MockSoc / StrumentoSoc           <- this package (the substrate)
    StrumentoSoc   ->  PythonCall -> Python strumento  (from_solution -> compile -> acquire -> reduce)
      strumento    ->  device model . pulse IR . compiler . program     (the authority)
        board

Intonato (the loop chassis) sits above this package and depends on it; the substrate is loadable without the control stack, the physics stack, or the Python bridge — the extensions attach exactly when their trigger deps (Piccolo, PythonCall) load, every base verb dispatches through, and the extension types are one Base.get_extension away, while a sysimage or a twin-light consumer loads only the light base. The pure-Julia MockSoc short-circuits the bottom rungs with a QuantumSystem rollout (Piccolo rollout), so the soc contract is exercised board-free.

Usage (mock)

using Strumento, Piccolo

# The mock type is extension-defined (extension exports do not surface on the
# parent module) — reach it through its canonical handle:
using Strumento: Strumento
MockSoc = Base.get_extension(Strumento, :StrumentoPiccoloExt).MockSoc

# True device dynamics the "board" has (here with a model mismatch):
sys_true = QuantumSystem(1.1 * σz, [σx], [1.0])
soc = MockSoc(sys_true, ψ_init, ψ_goal; dac_rate = 80.0)

map = QickChannelMap([QickGenChannel(0, 5e9; i_drive = 1)]; n_drives = 1)

# Translate + play + read: raw per-knot IQ blobs (default forward model:
# populations, packed complex — invert with `real`).
raw = execute!(soc, pulse, map, [N])

# Or convert to measurements with a discriminator:
ms = iq_to_measurements(raw, b -> real.(b), [N])

Closing the loop (upload/trigger/readout through StrumentoBackend, wrapping the soc as a HardwareExperiment for PulseTuningProblem) is the Intonato-side seam — see Intonato ≥ its next release.

On a real board, swap MockSoc for a StrumentoSoc pointed at a strumento device instance:

soc = StrumentoSoc("devices/multimode_demo/device.yaml";
                   drive_map = [(1, "qubit", "drive", 4000.0)],   # (drive index, line, role, carrier MHz)
                   dac_rate = 9.6e9, adc_rate = 2.4576e9, board = pyqicksoc)

Data-provenance note

StrumentoBackend's last_raw stash and the ExperimentRecord logging discussion moved with the seam to Intonato (its QILC chassis calls run_experiment with no logger today; full raw-IQ-into-record provenance during closed-loop runs is a planned Intonato enhancement).

Status

Interface-complete with a tested pure-Julia mock suite. The real-board StrumentoSoc delegation path is validated with the QICK collaboration on hardware (it needs the Python strumento package + a board and is not exercised in CI). The twin core (drift, records, truth/belief contract) is absorbed from Sosia.jl (issue #15); the twin's soc face (TwinSoc, issues #20/#23) and the bosonic family factory — the dispersive transmon-ancilla–cavity system with Lindblad decay, from the twin's current truth (issue #21) — ride the Piccolo extension, which also rolls OpenQuantumSystem family builders through the Lindblad master equation. Family physics factories for the other families (transmon, spin, atoms) and the wire server are later slices. Calibration routines and multi-board orchestration remain out of scope. The weakdeps/extensions split (issue #16) is done: Piccolo and PythonCall are package extensions — the base package (contract + twins) loads in an environment with neither, checked by test/configurations/load_config_check.jl; Pkg.test() still runs the full configuration (both triggers ride the test target).