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We introduce an adiabatic transfer protocol for spin states in large quantumdot arrays that is based on time-dependent modulation of the Heisenbergexchange interaction in the presence of a magnetic field gradient. We refer tothis protocol as spin-CTAP (coherent transport by adiabatic passage) in analogyto a related protocol developed for charge state transfer in quantum dotarrays. The insensitivity of this adiabatic protocol to pulse imperfections haspotential advantages for reading out extended spin qubit arrays. When thestatic exchange interaction varies across the array, a quantum-controlledversion of spin-CTAP is possible, where the transfer process is conditional onthe spin states in the middle of the array. This conditional operation can beused to generate N-qubit entangled GHZ states. Using a realistic noise model,we analyze the robustness of the spin-CTAP operations and find thathigh-fidelity (>95%) spin eigenstate transfer and GHZ state preparation isfeasible in current devices.

Coherent transport of spin by adiabatic passage in quantum dot arrays