Purification of photonic graph states
A preprint on arXiv describes a purification procedure for photonic graph states, targeting noise introduced by deterministic generation from quantum emitters with a hosted spin. The authors note that such emitter-based sources reduce the multiplexing overhead of probabilistic linear-optics approaches but are subject to several noise sources. The proposed method aims to improve the quality of graph states used as building blocks for measurement-based photonic quantum computing.
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What this could mean
- 0–2 yearsPlausible
Within two years, this purification approach could be tested on existing deterministic single-photon emitters to assess whether emitter-generated photonic graph states can reach fidelities required for fault-tolerant measurement-based quantum computing.
Several labs already operate quantum emitters with hosted spins and can generate small graph states; if the proposed protocol is experimentally viable and compatible with current control, it would provide a practical route to raising state fidelity before full error correction is available.
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