论文标题
误差对量子信息通过遥远的量子点旋转QPIT的运输影响
Influence of errors on the transport of quantum information through distant quantum dot spin qubits
论文作者
论文摘要
连接遥远量子位的能力在量子计算中起着基本作用。因此，用于量子计算的量子系统候选者必须能够相互作用。在这里，我们通过与最接近邻骨相互作用的自旋链对量子点旋转量值进行建模。在此模型中，我们可以通过连续交换门的作用执行遥远量子位的相互作用。交换门交换了两个不同量子位的信息，并通过随着量子信息通过系统传播而开关和关闭的最接近邻居量子位的时间相关相互作用获得。通过使用此方案，我们还可以实现CNOT门，这是获得通用量子计算的基本门。这些门被探测到无熔点的系统中，该系统在遥远的Qubits之间提供了非常有效的连接。此外，我们分析存在耗散的情况。为了执行此类任务，我们考虑自旋链每个位点中的误差类型和振幅阻尼类型。我们发现，交换和cnot门的顺序很重要，当量子数较大时，它可能会导致忠诚度的相关差异。
The ability to connect distant qubits plays a fundamental role in quantum computing. Therefore, quantum systems candidates for quantum computation must be able to interact all their constituent qubits. Here, we model the quantum dot spin qubits by a spin chain with nearest-neighbors interaction. Within this model, we can perform the interaction of distant qubits by the action of consecutive SWAP gates. The SWAP gate exchange the information of two different qubits and it is obtained by a time-dependent interaction of nearest-neighbors qubits that is switched on and off as the quantum information is propagated through the system. By using this scheme, we also are able to implement the CNOT gate, which is a fundamental gate to obtain universal quantum computation. These gates are probed in a system free from decoherence, which provides a very efficient connection between distant qubits. Furthermore, we analyze the situation when the dissipation is present. To perform such a task, we consider dephasing and amplitude-damping types of errors in each site of the spin chain. We found that the order of the SWAP and CNOT gates is important and it can lead to a relevant difference in fidelity when the number of qubits is large.
