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.

为了实现量子计算，已经对半导体量子点中的电子自旋进行了深入研究，并且最近已经实现了高保真单量子位和二量子位运算。量子隐形传态是一种利用量子纠缠的三比特协议，是更复杂的量子算法的基本原语。在这里，我们演示了一种基于Pauli排除原理的三倍量子点中单电子自旋量子位的直接Bell测量的量子隐形传态方案，该方案可创建和检测最大纠缠态。单自旋极化从输入量子位传送到输出量子位。我们发现，保真度主要受单重态-三重态混合的限制，可以通过优化设备参数来提高其保真度。