We introduce an adiabatic transfer protocol for spin states in large quantum dot arrays that is based on time-dependent modulation of the Heisenberg exchange interaction in the presence of a magnetic field gradient. We refer to this protocol as spin-CTAP (coherent transport by adiabatic passage) in analogy to a related protocol developed for charge state transfer in quantum dot arrays. The insensitivity of this adiabatic protocol to pulse imperfections has potential advantages for reading out extended spin qubit arrays. When the static exchange interaction varies across the array, a quantum-controlled version of spin-CTAP is possible, where the transfer process is conditional on the spin states in the middle of the array. This conditional operation can be used to generate $N$-qubit entangled GHZ states. Using a realistic noise model, we analyze the robustness of the spin-CTAP operations and find that high-fidelity ($>$95$%$) spin eigenstate transfer and GHZ state preparation is feasible in current devices.

中文翻译：

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量子点阵列中绝热通道的自旋相干输运

我们针对大量子点阵列中的自旋态引入了绝热转移协议，该协议基于在磁场梯度存在下海森堡交换相互作用的时间依赖性调制。我们将此协议称为spin-CTAP（绝热通道的相干传输），类似于为量子点阵列中的电荷状态转移而开发的相关协议。该绝热协议对脉冲缺陷的不敏感性对于读出扩展的自旋量子比特阵列具有潜在的优势。当静态交换相互作用在整个阵列上变化时，自旋CTAP的量子控制形式是可能的，其中转移过程取决于阵列中间的自旋状态。此条件操作可用于生成$ñ$-qubit纠缠了GHZ状态。使用逼真的噪声模型，我们分析了自旋CTAP操作的鲁棒性，并发现高保真度（$>$95$％$）自旋本征态转移和GHZ状态准备在当前设备中是可行的。