Room-Temperature Mechanical Resonator with a Single Added or Subtracted Phonon,Physical Review Letters

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Room-Temperature Mechanical Resonator with a Single Added or Subtracted Phonon
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-09-20 , DOI: 10.1103/physrevlett.127.133602
Rishi N Patel ₁ , Timothy P McKenna ₁ , Zhaoyou Wang ₁ , Jeremy D Witmer ₁ , Wentao Jiang ₁ , Raphaël Van Laer ₁ , Christopher J Sarabalis ₁ , Amir H Safavi-Naeini ₁

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A room-temperature mechanical oscillator undergoes thermal Brownian motion with an amplitude much larger than the amplitude associated with a single phonon of excitation. This motion can be read out and manipulated using laser light using a cavity-optomechanical approach. By performing a strong quantum measurement (i.e., counting single photons in the sidebands imparted on a laser), we herald the addition and subtraction of single phonons on the 300 K thermal motional state of a 4 GHz mechanical oscillator. To understand the resulting mechanical state, we implement a tomography scheme and observe highly non-Gaussian phase-space distributions. Using a maximum likelihood method, we infer the density matrix of the oscillator, and we confirm the counterintuitive doubling of the mean phonon number resulting from phonon addition and subtraction.

中文翻译：

具有单个加减声子的室温机械谐振器

室温机械振荡器进行热布朗运动，其振幅远大于与单个激发声子相关的振幅。可以使用激光通过腔体光机械方法读出和操纵这种运动。通过执行强量子测量（即，对激光施加的边带中的单个光子进行计数），我们预示着 4 GHz 机械振荡器的 300 K 热运动状态上单个声子的加减。为了了解由此产生的机械状态，我们实施了断层扫描方案并观察了高度非高斯相空间分布。使用最大似然方法，我们推断了振荡器的密度矩阵，并确认了由声子加法和减法产生的平均声子数的反直觉加倍。

更新日期：2021-09-21

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