arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.09802quant-phphysics.atom-phphysics.optics
收藏

原子自旋纳米机械膜的相干反馈冷却

Coherent feedback cooling of a nanomechanical membrane with atomic spins

Gian-Luca Schmid, Chun Tat Ngai, Maryse Ernzer, Manel Bosch Aguilera, Thomas M. Karg, Philipp Treutlein

摘要:

相干反馈使系统稳定在目标状态,而不需要测量,从而避免了测量所固有的量子反作用。在这里,我们采用光学相干反馈远程冷却纳米机械膜使用原子自旋作为控制器。直接操纵原子使我们能够从强耦合调谐到过阻尼状态。利用我们的系统提供的全相干控制,我们进行自旋膜态交换结合频闪自旋泵冷却膜在室温环境中的${T}={216}\,\mathrm{mK}$($\bar{n}_{m} = 2.3\times 10^3$声子)在${200}\,\mathrm{μs}$。我们进一步观察和研究延迟反馈对冷却性能的影响。从低温预冷膜开始,这种方法将使机械振荡器冷却到接近其量子力学基态,并制备非经典态。

英文摘要:

Coherent feedback stabilises a system towards a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements. Here, we employ optical coherent feedback to remotely cool a nanomechanical membrane using atomic spins as a controller. Direct manipulation of the atoms allows us to tune from strong-coupling to an overdamped regime. Making use of the full coherent control offered by our system, we perform spin-membrane state swaps combined with stroboscopic spin pumping to cool the membrane in a room-temperature environment to ${T}={216}\,\mathrm{mK}$ ($\bar{n}_{m} = 2.3\times 10^3$ phonons) in ${200}\,\mathrm{μs}$. We furthermore observe and study the effects of delayed feedback on the cooling performance. Starting from a cryogenically pre-cooled membrane, this method would enable cooling of the mechanical oscillator close to its quantum mechanical ground state and the preparation of nonclassical states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑