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The work shows optical initialisation, coherent manipulation, and readout of a single electron spin bound to an impurity in zinc selenide, a solid-state platform relevant to spin-based qubits and photonic quantum networks. The Rabi oscillations and hyperfine effects are meaningful characterisation steps, but this is a single-platform demonstration, and the reported spin relaxation figure (T1) is given without units or a clear error interpretation. Readers should watch for follow-up work on coherence times, fidelity, and scaling beyond one donor.

Sources coveringQuantum Zeitgeist, Trail of Bits Blog, arXiv, SiliconANGLE

Researchers Control Single Electron Spin with Light

Quantum ZeitgeistOctober 30, 20265 min read

A persistent barrier to scalable quantum networks, complete control over individual spins using only light, has now been overcome within zinc selenide. Establishing the first demonstration of its kind, researchers achieved experimentally determined spin relaxation (T1) of 18. 5 ±3.

Complete coherent control, initialisation, manipulation, and readout of a single electron spin bound to an impurity within zinc selenide has been achieved. This enables detailed investigation of the donor’s spin dynamics including relaxation times and Rabi oscillations; it also reveals coherent population trapping, a quantum state where excitation is suppressed, and hyperfine interactions between electrons and atomic nuclei. These findings establish isolated optical donors as promising building blocks for solid-state qubits with potential applications in scalable quantum technologies. Complete light-based control over an individual electron’s spin within zinc selenide was demonstrated by both initiating and…

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