Engineering two-qubit gates by way of anisotropic change in germanium spin qubits

arXiv:2608.16716v1 Announce Sort: cross
Summary: Germanium gap spin qubits are a promising and versatile platform for quantum computation and simulation. On this system, sturdy spin-orbit interplay (SOI) renders the single-qubit $g$-tensor anisotropic and electrically tunable, enabling operational candy spots with lowered noise sensitivity. SOI additionally transforms the isotropic two-qubit change coupling into an anisotropic tensor whose geometry is inherited from the single-qubit $g$-tensors and spin-flip tunnelling. Right here, utilizing two gap spin qubits in a strained-germanium quantum effectively and full vector management of the magnetic subject, we map this change tensor, separate it into longitudinal and transverse parts, and present that they govern controlled-phase and SWAP-like dynamics, respectively. We discover that the longitudinal change could be tuned by way of the magnetic subject orientation from a traditional constructive worth, via zero, to an successfully destructive one, as measured by inverted exchange-split spin transitions. The magnetic subject route thus gives steady management over the interplay Hamiltonian: at a degree of purely transverse change, we engineer a single-pulse baseband iSWAP, unattainable below isotropic change. Linking $g$-tensor geometry to change anisotropy establishes native Hamiltonian engineering, enabling spin-based quantum simulation and gate units chosen by the worldwide subject orientation alone.



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