We report implementation of a resonantly driven singlet-triplet spin qubit in silicon. The qubit is defined by the two-electron antiparallel spin states and universal quantum control is provided through a resonant drive of the exchange interaction at the qubit frequency. The qubit exhibits long $T_2^{*}$ exceeding $1\mu \mathrm{s}$ that is limited by dephasing due to the ${}^{29}\mathrm{Si}$ nuclei rather than charge noise thanks to the symmetric operation and a large micromagnet Zeeman field gradient. The randomized benchmarking shows 99.6% single gate fidelity which is the highest reported for singlet-triplet qubits.

中文翻译：

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硅中共振驱动的单重态-三重自旋量子位

我们报告了在硅中谐振驱动的单重态-三重态自旋量子位的实现。量子位由双电子反平行自旋态定义，并且通过以量子位频率共振交换相互作用来提供通用量子控制。量子比特展长${Ť}_2^{*}$ 超过 $\mathrm{1个}\mu \mathrm{s}$ 由于受到相移的限制 ${}^{29}硅$由于对称操作和大的微磁体塞曼磁场梯度，核而不是电荷噪声。随机基准测试显示99.6％的单门保真度，这是单线三重态qubit的最高记录。