六方氮化硼中核自旋的任意操控
Arbitrary manipulation of nuclear spins in hexagonal boron nitride
AI总结：
提出利用电子自旋作为辅助，通过背景磁场和多音连续驱动，在六方氮化硼中实现核自旋的单比特和多比特门，保真度分别达99%和95%。
摘要：
由于其局域性和可控性，六方氮化硼（hBN）中的带负电硼空位中心（V$_\text{B}^-$）是一种有前景的自旋平台，可访问其邻近核自旋，并具有执行量子计算任务的潜力。然而，利用和操控核自旋的方法仍然缺乏。在这项工作中，我们提出了一种协议，用于在核自旋上制备单比特和多比特门，利用电子自旋作为辅助量子比特。通过施加背景磁场和多音连续驱动，我们展示了电子自旋与核的耦合可以被有效调控。这允许通过Hahn回波脉冲序列抑制不需要的电子-核相互作用。然后通过采用适当的射频驱动来实现目标门。我们在实际参数下的数值结果表明，单比特门的保真度高达99%，多比特门的保真度高达95%。由于门执行时间小于300纳秒，我们的协议避免了电子自旋退相干效应。因此，我们的方案为hBN中V$_\text{B}^-$在量子计算中的实际应用奠定了基础。
英文摘要：
Due to its localized nature and controllability, the negatively charged boron vacancy centers (V$_\text{B}^-$) in hexagonal boron nitride (hBN) are a promising spin platform for accessing its neighboring nuclei with potential for performing quantum computational tasks. However, the methods of utilizing and manipulating the nuclear spins are still lacking. In this work, we propose a protocol for the preparation of single- and multi-qubit gates on the nuclear spins, utilizing the electron spin as an auxiliary qubit. By applying a background magnetic field and a multi-tone continuous drive, we show that the electron spin coupling to the nuclei can be efficiently engineered. This allows for suppressing the undesired electron-nuclear interactions through the Hahn echo pulse sequence. The target gates are then implemented by employing proper RF drives. Our numerical results for realistic parameters show gate fidelities as high as $99\%$ for single-qubit and $95\%$ for multi-qubit gates. With the gate execution durations being less than $300$ ns, our protocol evades electron spin decoherence effects. Therefore, our scheme sets the stage for the practical application of V$_\text{B}^-$ in hBN for quantum computation purposes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
