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PGBO quantum geometric tensor product

Metric + Berry curvature on coupling space extracted from quantum ground states via ambient compute_pgbo_tensor. Small-system simulation only; fail- closed oscillator caps; no experimental geometry overclaim.

Module: scpn_quantum_control.pgbo_qgt_product

Rules

Rule Behaviour
Product schema pgbo_qgt_product.v2
Ambient pgbo.quantum_bridge.compute_pgbo_tensor
Max oscillators MAX_OSCILLATORS = 6 (fail closed)
Derivatives Central FD on K with phase alignment (not exact AD)
Experimental geometry Refuse invent-green
Live QPU Refuse under the hardware-safe no-submit policy

Quick start

from scpn_quantum_control.pgbo_qgt_product import (
    assert_pgbo_qgt_product_integrity,
    build_pgbo_qgt_product_registry,
    decide_qgt_path,
    materialise_demo_pgbo_tensor_probe,
)

reg = assert_pgbo_qgt_product_integrity(build_pgbo_qgt_product_registry())
assert reg["experimental_geometry_claim_policy"] is False

assert decide_qgt_path(
    "pgbo_tensor", invent_green_experimental_geometry=True
).allowed is False

probe = materialise_demo_pgbo_tensor_probe()
assert probe.n_parameters == 1
assert probe.invent_green_live_qpu is False

Registry integrity

Schema v2 accepts only the canonical registry keys, claim boundary, public surface map, policy note, capability rows, boundary rows, size cap, and default finite-difference epsilon. Schema v1 and drifted serialized content fail closed; no planning-code compatibility aliases are retained. The product schema remains part of each deterministic probe digest, while the QGT observables and numerical method are unchanged.

Residuals (honest)

  • Dashboard integration depth remains open
  • Metamorphic registration depth remains open
  • Ambient: scpn_quantum_control.pgbo.quantum_bridge
  • Geometric-control catalogue · hardware-safe no-submit policy

Authored by Anulum Fortis & Arcane Sapience (protoscience@anulum.li)