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Spin-orbit coupling fundamentally alters spin qubits, opening pathways toimprove the scalability of quantum computers via long distance couplingmediated by electric fields, photons, or phonons. It also allows for newengineered hybrid and topological quantum systems. However, spin qubits withintrinsic spin-orbit coupling are not yet viable for quantum technologies dueto their short ($\sim1~\mu$s) coherence times $T_2$, while qubits with long$T_2$ have weak spin-orbit coupling making qubit coupling short-ranged andchallenging for scale-up. Here we show that an intrinsic spin-orbit coupled"generalised spin" with total angular momentum $J=\tfrac{3}{2}$, which isdefined by holes bound to boron dopant atoms in strained $^{28}\mathrm{Si}$,has $T_2$ rivalling the electron spins of donors and quantum dots in$^{28}\mathrm{Si}$. Using pulsed electron paramagnetic resonance, we obtain$0.9~\mathrm{ms}$ Hahn-echo and $9~\mathrm{ms}$ dynamical decoupling $T_2$times, where strain plays a key role to reduce spin-lattice relaxation and thelongitudinal electric coupling responsible for decoherence induced by electricfield noise. Our analysis shows that transverse electric dipole can beexploited for electric manipulation and qubit coupling while maintaining a weaklongitudinal coupling, a feature of $J=\tfrac{3}{2}$ atomic systems with astrain engineered quadrupole degree of freedom. These results establishsingle-atom hole spins in silicon with quantised total angular momentum, notspin, as a highly coherent platform with tuneable intrinsic spin-orbit couplingadvantageous to build artificial quantum systems and couple qubits over longdistances.

Engineering long spin coherence times of spin-orbit systems