Probabilistic teleportation of a quantum dot spin qubit
Probabilistic teleportation of a quantum dot spin qubit
复制标题
量子点自旋量子位的概率隐形传态
DOI：
10.1038/s41534-021-00403-4
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发表时间：
2021
影响因子：
7.6
通讯作者：
A. D. Wieck and S. Tarucha
中科院分区：
文献类型：
--
作者：
Y. Kojima;T. Nakajima;A. Noiri;J. Yoneda;T. Otsuka;K. Takeda;S. Li;S. D. Bartlett;A. Ludwig;A. D. Wieck and S. Tarucha
为了实现量子计算，半导体量子点中的电子自旋得到了深入的研究，最近实现了高保真的单量子比特和双量子比特操作。量子隐形传态是一种利用量子纠缠的三量子比特协议，它是更复杂的量子算法的基本基础。在这里，我们展示了一种基于直接贝尔测量的量子隐形传态方案，该方案利用泡利不相容原理对三重量子点中的单电子自旋量子比特进行直接贝尔测量，以创建和检测最大纠缠态。将单自旋极化从输入量子比特传送到输出量子比特。我们发现这种保真度主要受到单重态-三重态混合的限制，可以通过优化器件参数来提高保真度。我们的结果可以扩展到具有更大数量半导体自旋量子比特的量子算法。
Electron spins in semiconductor quantum dots have been intensively studied for implementing quantum computation and high-fidelity single- and two-qubit operations have recently been achieved. Quantum teleportation is a three-qubit protocol exploiting quantum entanglement and it serves as an essential primitive for more sophisticated quantum algorithms. Here we demonstrate a scheme for quantum teleportation based on direct Bell measurement for a single-electron spin qubit in a triple quantum dot utilizing the Pauli exclusion principle to create and detect maximally entangled states. The single spin polarization is teleported from the input qubit to the output qubit. We find this fidelity is primarily limited by singlet–triplet mixing, which can be improved by optimizing the device parameters. Our results may be extended to quantum algorithms with a larger number of semiconductor spin qubits.