qdsv-bridge 0.1.4

Lightweight Python client for QDSV Bridge, a controlled semantic-to-circuit compiler with family-based export modes.

QDSV Bridge Developer Preview

Current package version: 0.1.4.

QDSV Bridge is a lightweight Python client SDK for a controlled semantic-to-circuit bridge built on QDSV - Quantum Declarative Semantic Value.

It turns supported problem-family specifications into problem-derived circuit materializations, QDSV IR, oracle specs, QASM/Qiskit artifacts or expert construction inputs.

QDSV Bridge is not a template selector and not a free arbitrary circuit generator. Its core rule is:

do not force the problem into a prefabricated circuit;
derive the circuit or construction inputs from the semantic problem specification.

5 Minute Quickstart

Install the SDK:

pip install qdsv-bridge

Build a circuit-oriented artifact from a compact semantic spec:

from qdsv_bridge import QDSVBridgeClient

client = QDSVBridgeClient(api_key="YOUR_QDSV_API_KEY")

spec = {
    "family": "semantic_signal_classification",
    "state_space": {
        "kind": "finite_candidates",
        "candidate_count": 300,
        "candidate_id": "eeg_window",
    },
    "signals": [
        "dwt_cD3_std_score",
        "std_score",
        "activity_score",
        "energy_score",
        "dwt_cD2_std_score",
        "complexity_score",
    ],
    "goal": {
        "kind": "binary_marking",
        "positive_state": "ictal",
    },
    "materialization_policy": {
        "preserve_signal_geometry": True,
        "avoid_fixed_ansatz": True,
        "avoid_forced_dimensionality_reduction": True,
        "report_information_loss": True,
    },
    "target": {
        "format": "qasm3",
        "backend_family": "qiskit",
    },
    "limits": {
        "max_qubits": 10,
        "max_depth": 300,
    },
}

result = client.build(spec)

print(result["status"])
print(result["bridge_mode"])
print(result["circuit_origin"])
print(result["artifact"]["format"])

Default cloud endpoint:

https://api.qdsv.cloud/api

Private/local Docker endpoint:

client = QDSVBridgeClient.local()

What This Is

• A client SDK for QDSV Bridge.
• A controlled semantic-to-circuit export interface.
• A way to request QDSV IR, oracle specs, QASM/Qiskit artifacts or expert construction inputs.
• A bridge for users who need circuit ecosystems but do not want to start from prebuilt templates.

What This Is Not

• It is not the private QDSV Runtime.
• It is not a bulk data processing SDK.
• It is not a hardware execution SDK.
• It is not an arbitrary circuit generator.
• It is not a selector of prefabricated circuit templates.
• It does not expose CAP, backend selection heuristics, private lowering internals, QuEST/Aer/IBM adapters, secrets or production configuration.

Why This Exists

Traditional quantum workflows often start by asking users to choose a circuit, encoding, ansatz or measurement pattern. That can force the data to adapt to a circuit.

QDSV Bridge starts from a controlled semantic family. The family defines what kind of problem is allowed, what concepts belong to it, what patterns are excluded and what evidence must be produced.

problem family spec
-> family ontology validation
-> semantic ProblemSpec / IR
-> oracle specification
-> materialization policy
-> generated circuit artifact or expert construction inputs

For users who need circuit ecosystems, Bridge derives a new circuit artifact from that semantic specification instead of asking the user to adapt the problem to a ready-made template.

For expert constructors, Bridge can also return the key semantic inputs needed to design a custom circuit without forcing a final circuit.

Bridge Modes

QDSV Bridge is one SDK with multiple output depths. The modes do not change the core principle: the circuit, when delivered, is derived from the semantic problem specification.

API	Commercial name	Intended user	What Bridge returns
generate() / use	Bridge Use	Basic user who wants to solve without designing circuits.	A new problem-derived circuit artifact, simple explanation, information-loss risk, usage recommendation and ready-to-run example.
build() / build	Bridge Build	Intermediate user who understands Qiskit, QASM or quantum workflows.	A new problem-derived circuit artifact plus QASM/Qiskit, oracle spec, IR summary, preservation report, estimated qubits/depth and digests.
prepare() / expert_prepare	Bridge Expert Prepare	Expert constructor who wants to design a custom circuit.	Validated family, ProblemSpec/IR, oracle spec, predicates, target state/goal, constraints, variables, information-loss risk, encoding/measurement suggestions, estimated limits and evidence. It does not force a final circuit.
evaluate() / expert_evaluate	Bridge Expert Evaluate	Expert evaluator who wants to compare QDSV materializations.	Suggested QDSV circuit artifact, materialization variants, comparison and preservation report.

Python helpers:

client.generate(spec)  # mode="use"
client.build(spec)     # mode="build"
client.prepare(spec)   # mode="expert_prepare"
client.evaluate(spec)  # mode="expert_evaluate"

Explicit mode:

client.export(spec, mode="build")
client.explain(spec, mode="expert_prepare")

CLI:

qdsv-bridge export spec.json --mode use --api-key YOUR_QDSV_API_KEY
qdsv-bridge export spec.json --mode build --api-key YOUR_QDSV_API_KEY
qdsv-bridge export spec.json --mode expert_prepare --api-key YOUR_QDSV_API_KEY
qdsv-bridge export spec.json --mode expert_evaluate --api-key YOUR_QDSV_API_KEY

Every export response should include traceability metadata:

{
  "mode": "use | build | expert_prepare | expert_evaluate",
  "artifact_type": "qasm3",
  "circuit_origin": "qdsv_derived",
  "semantic_preservation": {"status": "accepted", "score": 1.0},
  "warnings": [],
  "digests": {}
}

Examples By User Type

Basic user:

result = client.generate(spec)
print(result["circuit_origin"])          # qdsv_derived
print(result["circuit"]["status"])       # generated_from_semantic_spec
print(result["ready_to_run_example"])

Intermediate developer:

result = client.build(spec)
print(result["artifact"]["format"])
print(result["editable_artifacts"]["oracle_spec"])
print(result["editable_artifacts"]["ir_summary"])
print(result["digests"])

Expert constructor:

inputs = client.prepare(spec)
print(inputs["expert_inputs"]["encoding_suggestions"])
print(inputs["expert_inputs"]["measurement_suggestions"])

Expert evaluator:

comparison = client.evaluate(spec)
print(comparison["materialization_variants"])
print(comparison["comparison"])

Supported Families

Developer Preview families:

• bounded_semantic_marking
• semantic_signal_classification
• predicate_marking
• state_similarity
• combinatorial_relation
• distribution_sampling

bounded_semantic_marking is the controlled fallback family. Use it when the problem is finite, bounded and semantic, but no specialized Bridge family exists yet.

It is not a universal free-form mode: it still requires a bounded state space, declared goal, limits, excluded patterns and preservation reporting.

Each family has:

• ontology boundary;
• allowed state-space kinds;
• allowed goal kinds;
• allowed semantic operations;
• excluded patterns;
• public limits;
• export targets;
• evidence / digest contract.

Fallback example:

spec = {
    "family": "bounded_semantic_marking",
    "state_space": {
        "kind": "finite_candidates",
        "candidate_count": 128,
        "candidate_id": "candidate",
    },
    "signals": ["risk_score", "value_score", "eligibility_score"],
    "goal": {
        "kind": "marking",
        "predicate": "eligible_candidate",
    },
    "target": {
        "format": "qasm3",
        "backend_family": "qiskit",
    },
    "limits": {
        "max_qubits": 8,
        "max_depth": 250,
    },
}

result = client.build(spec)
print(result["family"])
print(result["circuit_origin"])
print(result["warnings"])

What It Exports

Depending on target.format, QDSV Bridge can export:

• problem_spec
• ir
• oracle_spec
• qasm2
• qasm3
• qiskit_blueprint

For use and build, circuit-oriented targets return a circuit artifact derived from the semantic spec, with explicit QDSV oracle/digest information and preservation metadata.

In Developer Preview, some targets are returned as integration blueprints with semantic oracle insertion points so external platforms can inspect, execute, optimize or complete the materialization safely.

For expert_prepare, Bridge may intentionally return construction inputs instead of forcing a final circuit. This is useful when an expert wants to design a custom circuit with the correct semantic ingredients.

Public Endpoints

The SDK calls the QDSV API:

• GET /api/bridge/families
• POST /api/bridge/validate
• POST /api/bridge/compile
• POST /api/bridge/explain
• POST /api/bridge/export

Default cloud endpoint:

client = QDSVBridgeClient(api_url="https://api.qdsv.cloud/api")

Local/private Docker endpoint:

client = QDSVBridgeClient.local()

Public informational endpoints such as families() are open. Value-producing compilation/export operations require an SDK API key.

Resource And Multi-User Limits

QDSV Bridge accepts compact semantic problem specifications, not raw datasets.

Do not send:

• full CSV files;
• raw datasets;
• thousands of rows;
• sensitive records;
• training data;
• hardware execution requests.

Send:

• problem family;
• finite state-space size;
• prepared signal or variable names;
• goal / predicate / ranking intent;
• target format;
• qubit/depth limits;
• materialization policy.

Public API minimum limits:

Limit	Default
Max spec payload	64 KB
Max QASM / circuit artifact payload	256 KB
Max compile time	5 seconds
Max export time	10 seconds
API key required for	compile, export, generate, build, prepare, evaluate
Monthly demo quota	5 compilations/exports per API key
Raw data payloads	Not allowed
Hardware execution	Not available from Bridge SDK
bounded_semantic_marking	1024 candidates / 24 signals
semantic_signal_classification	1024 candidates / 32 signals
predicate_marking	2048 candidates / 8 signals
state_similarity	1024 candidates / 64 signals
combinatorial_relation	4096 candidates / 16 signals
distribution_sampling	2048 candidates / 16 signals

Default API rate limits may be configured by the QDSV deployment:

• families: 60/minute
• validate: 30/minute
• compile: 20/minute
• explain: 20/minute
• export: 10/minute

Rate limits use Authorization, x-api-key or x-license-key when present. Otherwise they fall back to IP plus SDK name.

In the current public deployment, rate limiting is in-memory per API instance. If Cloud Run scales to multiple instances, the effective limit may multiply until a distributed rate-limit store is enabled.

The SDK itself is stateless and does not block multiple users. Multi-user control, quotas, API keys, license checks and history belong to the QDSV/Qruba API deployment, not to the local Python package.

Raw dataset payloads are rejected:

{
  "detail": {
    "error_code": "E_BRIDGE_RAW_DATA_NOT_ALLOWED",
    "message": "Raw datasets are not allowed in Bridge specs. Provide semantic signals, predicates, candidates, or summarized problem structure instead.",
    "detail": {
      "forbidden_fields": ["rows"]
    }
  }
}

Examples And Roadmap

• Examples
• Roadmap
• QDSV model site
• Qruba Cloud
• PyPI

Important Boundaries

QDSV Bridge does not expose:

• QDSV Runtime internals;
• CAP internals;
• backend selection heuristics;
• private QuEST/Aer/IBM adapters;
• native lowering internals;
• unrestricted circuit generation;
• arbitrary Python execution;
• prefabricated circuit selection as the main product;
• user-supplied free circuits as family contracts.

Product principle:

controlled semantic family
-> problem-derived circuit materialization or expert inputs
-> auditable export

Not:

any input -> arbitrary circuit

Open SDK, Private Runtime

This repository is open-core:

• Open under MIT: Python client SDK, examples, docs and tests.
• Not included: QDSV Runtime, ontology compiler internals, CAP, lowering, advanced materialization, backend adapters, private endpoints, secrets or production configuration.

QDSV, QIntent and Qruba names and marks are project marks of their respective owners. The MIT License for this repository does not grant trademark rights.