论文标题
通过绝热通道在量子点阵列中旋转的连贯运输
Coherent transport of spin by adiabatic passage in quantum dot arrays
论文作者
论文摘要
我们在大量子点阵列中引入了一种旋转状态的绝热转移方案，该方案基于在存在磁场梯度的情况下基于海森堡交换相互作用的时间依赖性调制。我们将此方案称为旋转ctap（通过绝热通道的连贯运输），类似于与量子点阵列中的电荷状态传递开发的相关协议。这种对脉冲缺陷的绝热方案的不敏感性具有读取扩展的自旋量子阵列的潜在优势。当静态交换的交互在整个数组中变化时，可以使用量子对照版本的自旋ctap，其中传输过程是在阵列中间的旋转状态下的条件。该条件操作可用于生成N Qubit的纠缠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，并发现在当前设备中可行的高保真性（> 95％）自旋特征态转移和GHz状态制备是可行的。
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.
