论文标题
通用逻辑，带有硅的编码自旋吨位
Universal logic with encoded spin qubits in silicon
论文作者
论文摘要
在无腐蚀子系统中编码并在交换耦合硅量子点中实现的量子位是易耐故障量子计算的有希望的候选者。这种方法的好处包括出色的连贯性，低控制串扰以及对某些错误源的不敏感性。主要困难是编码的纠缠大门需要大量的控制脉冲和高收益的量子点阵列。在这里，我们显示了使用单层蚀刻定义的门电极体系结构制造的设备，该设备既实现了完全控制所需的所需功能收益率，又可以实现数以千计的校准交换脉冲所需的相干性。通过随机基准制定，我们的平均两倍克利福德保真度为$ 97.1 \ pm 0.2 \％$。我们还使用交织的随机基准测量，以$ 96.3 \ pm 0.7 \％$ fidelity，与$ 99.3 \ pm 0.5 \％$ fidelity交换，并以$ 93.8 \ pm 0.7 \ pm 0.7 \％$ 0.7 \％$ fidelity限制泄漏的特殊纠缠门。
Qubits encoded in a decoherence-free subsystem and realized in exchange-coupled silicon quantum dots are promising candidates for fault-tolerant quantum computing. Benefits of this approach include excellent coherence, low control crosstalk, and configurable insensitivity to certain error sources. Key difficulties are that encoded entangling gates require a large number of control pulses and high-yielding quantum dot arrays. Here we show a device made using the single-layer etch-defined gate electrode architecture that achieves both the required functional yield needed for full control and the coherence necessary for thousands of calibrated exchange pulses to be applied. We measure an average two-qubit Clifford fidelity of $97.1 \pm 0.2\%$ with randomized benchmarking. We also use interleaved randomized benchmarking to demonstrate the controlled-NOT gate with $96.3 \pm 0.7\%$ fidelity, SWAP with $99.3 \pm 0.5\%$ fidelity, and a specialized entangling gate that limits spreading of leakage with $93.8 \pm 0.7\%$ fidelity.
