论文标题
半导体量子点电子旋转之间的长距离大量换
Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins
论文作者
论文摘要
由于它们的连贯性时间和可伸缩性的潜力很长，因此半导体量子点旋转Qpin Qpin Qubits对量子信息处理有很大的希望。但是，保持量子点旋转量子位之间的高连通性，该量子旋转量子位有利于与最近的邻居耦合的线性阵列，这对大规模量子计算提出了挑战。在这项工作中，我们提供了半导体量子点中电子自旋矩之间的长距离旋转链介导的超链介导的互冲耦合的证据。我们将两个电子旋转薄弱，到两个站点自旋链的末端。根据链的自旋状态，我们观察到遥远的端旋转之间的振荡。我们解决了末端旋转和链条本身的动态，我们的测量结果与模拟一致。 superexchange是一种有前途的技术，可以在量子点旋转Qubits之间创建长距离耦合。
Because of their long coherence times and potential for scalability, semiconductor quantum-dot spin qubits hold great promise for quantum information processing. However, maintaining high connectivity between quantum-dot spin qubits, which favor linear arrays with nearest neighbor coupling, presents a challenge for large-scale quantum computing. In this work, we present evidence for long-distance spin-chain-mediated superexchange coupling between electron spin qubits in semiconductor quantum dots. We weakly couple two electron spins to the ends of a two-site spin chain. Depending on the spin state of the chain, we observe oscillations between the distant end spins. We resolve the dynamics of both the end spins and the chain itself, and our measurements agree with simulations. Superexchange is a promising technique to create long-distance coupling between quantum-dot spin qubits.
