AI 中文总结
研究利用最小化Kitaev链作为自旋量子比特的鲁棒耦合模块，通过安德列夫束缚态介导长距离、各向异性交换耦合，利用化学势控制耦合强度，创造最佳点实现强耦合及电荷噪声免疫，使受保护量子比特退相干时间大幅提升。
AI 中文摘要
虽然最小化Kitaev链有望承载未受保护的马约拉纳零模，但其在自旋量子比特中的作用相对未得到充分重视。随着近期在传输行为精细控制方面的突破，我们提议将最小化Kitaev链用作自旋量子比特之间的鲁棒耦合模块。长距离、各向异性交换耦合可由混合段中的安德列夫束缚态介导。安德列夫束缚态的化学势提供了一种简单方法来选择性控制耦合强度及其对局部扰动的响应。此外，这种额外的控制自由度创造了一个独特的最佳点，允许强耦合和对电荷噪声的一阶免疫。在最佳点处编码在最小化Kitaev链上的受保护量子比特的退相干时间提高了200倍以上。
英文摘要
While a minimal Kitaev chain is promised to host unprotected Majorana zero modes, its role for spin qubits is relatively underappreciated. Following recent breakthroughs in the fine control of transport behaviors, we propose to use minimal Kitaev chain as a robust coupling module between spin qubits. Long-distance, anisotropic exchange coupling can be mediated by the Andreev bound states (ABSs) in the hybrid segment. The chemical potential of ABS gives a simple way to selectively control the coupling strength and its response to local perturbations. Moreover, this additional control degree of freedom creates a unique sweet spot, allowing both strong coupling and first-order immunity against charge noise. The protected qubit encoded on the minimal Kitaev chain at the sweet spot is shown to boast over 200 fold improvement in decoherence time.
