Dipartimento di Fisica e Astronomia, Università di Firenze, via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
European Laboratory for Non-Linear Spectroscopy (LENS), via Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
Phys Rev Lett. 2023 May 12;130(19):193601. doi: 10.1103/PhysRevLett.130.193601.
With a levitodynamics experiment in the strong and coherent quantum optomechanical coupling regime, we demonstrate that the oscillator acts as a broadband quantum spectrum analyzer. The asymmetry between positive and negative frequency branches in the displacement spectrum traces out the spectral features of the quantum fluctuations in the cavity field, which are thus explored over a wide spectral range. Moreover, in our two-dimensional mechanical system the quantum backaction, generated by such vacuum fluctuations, is strongly suppressed in a narrow spectral region due to a destructive interference in the overall susceptibility.
利用强相干量子光机械耦合系统中的悬浮动力学实验，我们证明了振荡器可以作为一个宽带量子频谱分析仪。位移谱中的正频支和负频支之间的不对称性，反映了腔场量子涨落的频谱特征，从而在很宽的频谱范围内进行了探索。此外，在我们的二维力学系统中，由于整体灵敏度中的相消干涉，由这种真空涨落产生的量子反作用在一个很窄的频谱区域内被强烈抑制。
