QQLink coordinates quantum workflows, with networked hardware still ahead
A programming study tests workflow dependencies and states its hardware boundaries.
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QQLink aims to make it easier to express a quantum workflow in which a measurement at one node controls an operation at another. A new preprint describes a programming layer that builds the required dependency graph automatically from a single program.[1]
The authors test seven protocol workflows. Simulator checks validate the tested feedforward paths, and compiled circuits match equivalent hand-written constructions in two- gate and conditional-block counts. Separate executor processes also coordinate through delayed messages while a central simulation service holds the joint quantum state.[1]
Hardware experiments use two IBM Heron processors in separate runs, each divided into virtual quantum-processing units on the same chip. They do not demonstrate execution between physically networked processors.[1]
The paper also reports session-to-session variation and states that its coherence-sensitive checks do not establish coherent Toffoli operation or preservation of the intended repetition-code superposition.[1]
Submitted October 25, the work supports the tested workflow semantics while making the limits of the hardware realization explicit.[1]