Mao Z-C, Xu Y-Z, Mei Q-X, Zhao W-D, Jiang Y, Wang Y, Chang X-Y, He L, Yao L, Zhou Z-C, Wu Y-K, Duan L-M
Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China.
School of Physics, Peking University, Beijing 100871, People's Republic of China.
Phys Rev Lett. 2021 Oct 1;127(14):143201. doi: 10.1103/PhysRevLett.127.143201.
Trapped ions are one of the leading platforms in quantum information science. For quantum computing with large circuit depth and quantum simulation with long evolution time, it is of crucial importance to cool large ion crystals at runtime without affecting the internal states of the computational qubits, thus the necessity of sympathetic cooling. Here, we report multi-ion sympathetic cooling on a long ion chain using a narrow cooling beam focused on two adjacent ions, and optimize the choice of the cooling ions according to the collective oscillation modes of the chain. We show that, by cooling a small fraction of ions, cooling effects close to the global Doppler cooling limit can be achieved. This experiment therefore demonstrates an important enabling step for quantum information processing with large ion crystals.
囚禁离子是量子信息科学中的主要平台之一。对于具有大电路深度的量子计算和长时间演化的量子模拟，在运行时冷却大型离子晶体而不影响计算量子比特的内部状态至关重要，因此需要协同冷却。在此，我们报告了使用聚焦于两个相邻离子的窄冷却光束对长离子链进行多离子协同冷却，并根据链的集体振荡模式优化冷却离子的选择。我们表明，通过冷却一小部分离子，可以实现接近全局多普勒冷却极限的冷却效果。因此，该实验展示了使用大型离子晶体进行量子信息处理的重要一步。
