A deterministic substrate for quantum–classical coordination.
QSCS enables predictable, secure and reproducible coordination between quantum processors and classical compute nodes — without vendor-specific integrations or opaque orchestration layers.
Architecture Overview
QSCS is a three-layer coordination stack. The Integration & API Layer exposes developer-ready interfaces. The QCCP protocol provides hardware-agnostic orchestration.
The State Substrate ensures deterministic, reproducible execution across distributed nodes.
Deterministic State Substrate
The state substrate is the core execution engine. It maintains a canonical state model, enforces deterministic transitions, and records all changes in an append-only register — ensuring reproducibility and auditability across distributed nodes.
QCCP Protocol Flow
The Quantum–Classical Coordination Protocol mediates all interactions between classical workflows and quantum hardware. The daemon validates, routes, and orchestrates every request through a deterministic pipeline.
Distributed Quantum–Classical Compute
QSCS enables coordinated workflows across multiple classical nodes and quantum processors through a shared, deterministic state model. Each daemon instance synchronises via an append-only register.
Security & Trust Boundaries
QSCS enforces strict trust boundaries through authenticated QCCP envelopes, deterministic state transitions and controlled access to quantum hardware. Classical nodes never interact directly with hardware.
Daemon Internal Architecture
The QSCS daemon provides a modular, deterministic pipeline for all quantum–classical interactions. Each module validates, enforces policy, manages state, plans execution, and interfaces with quantum hardware.
Testbed Deployment
QSCS integrates into the operational testbed as a lightweight coordination layer. Classical workflow nodes communicate through QCCP envelopes, the daemon maintains the canonical state model, and execution requests reach quantum processors through a secure, policy-governed interface.
Design Principles
Determinism — every transition is reproducible and auditable.
Minimalism — no hidden magic, no implicit behaviour.
Isolation — strict trust boundaries between classical nodes and quantum hardware.
Summary
QSCS delivers a deterministic, hardware-agnostic orchestration substrate for quantum–classical systems. It provides:
A three-layer architecture — API, coordination protocol and state substrate
Deterministic state transitions — reproducible, auditable and tamper-evident
Distributed synchronisation — shared state across classical nodes via append-only registers
Strict security boundaries — policy-governed envelopes and controlled quantum access
A modular daemon pipeline — validation, policy, state, planning and hardware interface
This is a substrate designed for systems that must be predictable, reproducible and secure by construction.
QSCS is designed for environments where correctness, reproducibility and trust are non-negotiable.