Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH, United Kingdom.
QOLS, Blackett Laboratory, Imperial College London, London, SW7 2BW, United Kingdom.
Phys Rev Lett. 2018 Nov 2;121(18):180501. doi: 10.1103/PhysRevLett.121.180501.
Constructing a large-scale ion trap quantum processor will require entangling gate operations that are robust in the presence of noise and experimental imperfection. We experimentally demonstrate how a new type of Mølmer-Sørensen gate protects against infidelity caused by heating of the motional mode used during the gate. Furthermore, we show how the same technique simultaneously provides significant protection against slow fluctuations and mis-sets in the secular frequency. Since this parameter sensitivity is worsened in cases where the ions are not ground-state cooled, our method provides a path towards relaxing ion cooling requirements in practical realizations of quantum computing and simulation.
构建大规模离子阱量子处理器需要在噪声和实验不完美的情况下具有鲁棒性的纠缠门操作。我们通过实验证明了一种新型的莫尔-索尔森门如何防止由于门期间运动模式的加热而导致的不准确性。此外，我们还展示了相同的技术如何同时为慢波动和非周期性频率的错误设置提供显著的保护。由于在离子未处于基态冷却的情况下，这种参数敏感性会恶化，因此我们的方法为在量子计算和模拟的实际实现中放宽离子冷却要求提供了一条途径。
