Quantum State Transfer in Germanium Hole Spin Qubits

Semiconductor spin qubits offer long coherence times and compatibility with existing industrial transistor fabrication techniques, positioning them as a leading platform for scalable quantum computing. However, achieving robust controllable and non-local two-qubit interactions remains a major challenge. A key obstacle in hole-based systems is the strong intrinsic spin–orbit coupling, which introduces anisotropy into the exchange interaction and renders the conventional Heisenberg-type Hamiltonian description inadequate. This anisotropy, in fact, impedes qubit control and hinders quantum state and entanglement transfer. In this work, we show how the state transfer fidelity depends on the anisotropic exchange parameters by explicitly constructing an effective Hamiltonian. Using our analytical understanding, we show that exchange anisotropy can be systematically tuned to design efficient quantum information transfer protocols. Extending this framework to multi-qubit chains, we identify experimentally accessible conditions for achieving high-fidelity, long-distance coherent state transfer with reduced control complexity, establishing design principles for hole-based quantum processors.