In our latest work, we make use of our high-quality quantum dot single photon sources to entangle a single spin with successively emitted photons. We achieve full control over the spin by using fast optical pulses, enabling us to reconfigure the state we generate — on demand. With this new approach, we generate “caterpillar” graph states, the most general type of graph state that can be produced with a single emitter. This simple optical scheme is compatible with commercially available plug-and-play quantum dot-based single photon sources, marking an exciting leap towards scalable and fault-tolerant quantum computing powered by spins and photons.
Deterministic and reconfigurable graph state generation with a single solid-state quantum emitter
H. Huet, P.R. Ramesh, S.C. Wein, N. Coste, P. Hilaire, N. Somaschi, et al.
arXiv preprint, arXiv:2410.23518, 2024. https://arxiv.org/pdf/2410.23518
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Near-future example of all-photonic arbitrary caterpillar graph state generation. Pulse sequence combining excitation pulses (LA) and OSRP (φ = π, equivalent to a Z spin gate) for the generation of all-photonic arbitrary caterpillar graph state that can be generated with our protocol.
Each photon emitted following a Ry(π/2) gate will be encoded in a new node of the caterpillar graph state, whereas photons emitted after a Z gate will be redundantly encoded with the previous one, within the same node. The simulated fidelity of this state is estimated to be 0.80 ± 0.01 using a realistic near-term positive trion source.