近日，国防科技大学的陈平形与南方科技大学的林子栋合作并取得一项新进展。他们利用弗洛凯技术实现大失谐下的高保真度边带操纵，并应用于多模式冷却中。相关研究成果已于2024年11月11日在国际知名学术期刊《中国物理快报》上发表。

该研究团队采用弗洛凯技术这一强大的量子态操控手段，在大失谐条件下驱动边带跃迁。研究结果表明，通过在大失谐下优化合适的调制频率，可以实现超过99%的高保真度。研究人员通过使用单一调制频率，在高带宽内观察到了高保真度的跃迁，并揭示这一能力源于带宽范围内平带结构的出现。

在大失谐条件下实现高保真度边带操控的关键发现，已在核磁共振平台上得到了实验验证。最后，研究人员提出了一种新的并行边带冷却方案，能够同时冷却多个运动模式。与传统方案中固定的激光频率和功率相比，该方案提高了冷却速率，并且无需针对特定模式进行操作。这一弗洛凯并行方案适用于任何谐振子系统，并且在理论上不受带宽限制。

附：英文原文

Title: Manipulation of High-Fidelity Sidebands under Large Detuning by Floquet Technology: Application to Multi-Mode Cooling

Author:Xue-Ying Yang¹, Zi-Dong Lin², Shu-Ying Mu¹, Wei Wu¹, Chun-Wang Wu¹, Yi Xie¹, and Ping-Xing Chen^1*

Issue&Volume: 2024-11-11

Abstract: The Floquet technology, a powerful way to manipulate quantum states, is employed to drive sidebands transition under large detuning. Our results demonstrate that high fidelities over 99% can be achieved through optimizing suitable modulation frequencies under large detuning. We observe high-fidelity transitions within a high bandwidth by utilizing a single modulation frequency and reveal that this capability is due to the emergence of a flat-band structure in the bandwidth range. The key finding of high-fidelity sideband manipulation under large detuning is experimentally confirmed in nuclear magnetic resonance platform. Finally, we propose a new parallel sideband cooling scheme that enables simultaneous cooling of multiple motional modes. This approach improves the cooling rate compared to conventional schemes with fixed laser frequency and power, and eliminates the need for mode-specific addressing. Our Floquet parallel scheme is applicable to any harmonic oscillator system and is not limited by bandwidth in theory.

DOI: 10.1088/0256-307X/41/11/113702

Source: https://cpl.iphy.ac.cn/10.1088/0256-307X/41/11/113702