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Semiconductor quantum-dot spin qubits are a promising platform for quantumcomputation, because they are scalable and possess long coherence times. Inorder to realize this full potential, however, high-fidelity informationtransfer mechanisms are required for quantum error correction and efficientalgorithms. Here, we present evidence of adiabatic quantum-state transfer in achain of semiconductor quantum-dot electron spins. By adiabatically modifyingexchange couplings, we transfer single- and two-spin states between distantelectrons in less than 127 ns. We also show that this method can be cascadedfor spin-state transfer in long spin chains. Based on simulations, we estimatethat the probability to correctly transfer single-spin eigenstates and two-spinsinglet states can exceed 0.95 for the experimental parameters studied here. Inthe future, state and process tomography will be required to verify thetransfer of arbitrary single qubit states with a fidelity exceeding theclassical bound. Adiabatic quantum-state transfer is robust to noise andpulse-timing errors. This method will be useful for initialization, statedistribution, and readout in large spin-qubit arrays for gate-based quantumcomputing. It also opens up the possibility of universal adiabatic quantumcomputing in semiconductor quantum-dot spin qubits.

Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain