Juq-378 Access

Key to this design is the exploitation of symmetry‑protected decoherence‑free subspaces . The BCC lattice provides a highly isotropic magnetic environment, while the Mn(^2+) ions (high‑spin d⁵ configuration) experience a near‑zero crystal‑field splitting, allowing their electron spin (S = 5/2) to act as a multi‑level qudit. By tuning the Mn concentration to 0.2 at % and employing isotopic purification of Cu (⁶³Cu, ⁶⁵Cu) to suppress nuclear spin noise, the team achieved —a record for a bulk metallic system.

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The relies on a combination of molecular‑beam epitaxy (for the ultra‑pure Cu‑Ag matrix) and ion‑implantation (for Mn placement), followed by rapid thermal annealing to heal implantation damage while preserving qubit coherence. The waveguide network is defined by electron‑beam lithography, and the entire stack can be saw‑ed, milled, or 3‑D printed into arbitrary mechanical components. Key to this design is the exploitation of