Ground-state cooling of rotating mirror in double-Laguerre-Gaussian-cavity with atomic ensemble

Abstract

A scheme is proposed to cool a rotating mirror close to its ground state in a double-Laguerre-Gaussian-cavity optomechanical system, where an auxiliary cavity and a two-level atomic ensemble simultaneously couple to the original optomechanical cavity. By choosing parameters reasonably, we find that the cooling process of the rotating mirror can be strengthened greatly while the heating process can be suppressed effectively. We show that the proposed ground-state cooling scheme can work well no matter whether in the weak or strong coupling regime for the atomic ensemble and original cavity. Compared with previous related schemes, our scheme works in the unresolved sideband regime with fewer strict limitations for the auxiliary systems.

Modulation‐Based Atom‐Mirror Entanglement and Mechanical Squeezing in an Unresolved‐Sideband Optomechanical System

“…One can note that the lines in Figure a,b, which denote that the mechanical position is squeezed, just right correspond to the blue dashed line and red dashed line in Figure , respectively. As to the blue dashed line in Figure , due to the quantum interference cooling mechanism induced by atoms (one can also see Appendix), the mechanical oscillator can always be retained close to its ground state in the total evolution process even though . Accompanied by the periodic amplitude modulation with twice the mechanical frequency in this case, the dynamics of mechanical oscillator resembles the effect of parametric amplification and the spring constant is seems modulated at twice the mechanical resonance frequency due to the optical spring effect, hence the mechanical oscillator is squeezed.…”

“…Moreover, as we all know, in a standard optomechanical system, it is hard to realize ground‐state cooling in the unresolved‐sideband regime without the help of other auxiliary manipulation. The core idea to solve this problem is to introduce new auxiliary systems which are strongly coupled to the optical mode of the optomechanical system . Among them, the atomic ensemble is a potential candidate and the coupling between the atomic ensemble and the cavity mode has been realized in experiments …”

Optical nonreciprocal response and conversion in a Tavis‐Cummings coupling optomechanical system

“…) is the element in the vth row and the wth column of the matrix U(𝜔) in Equation (13). And 15) is the output spectrum caused by the input vacuum field and its elements are…”

“…In recent years, cavity optomechanics [1][2][3] (COM) has attracted a lot of attention due to its theoretical and experimental rapid development, which has produced many interesting phenomena, for example, the detection of gravitational waves, 4 mechanical squeezing, [5][6][7][8][9][10] quantum entanglement, 11,12 mechanical cooling, [13][14][15] nonclassical correlations between single photon and phonon, 16 photon blockade, 17 and coherent wavelength conversion. 18,19 The common optomechanical systems study the two-body interaction between the cavity field and mechanical resonator.…”

Simultaneous Cooling of Two Mechanical Resonators with Intracavity Squeezed Light

“…So far, various cooling schemes have been put forward in theory and successfully applied in experiments, for example, feedback cooling, [ 17–19 ] pure cryogenic cooling, [ 20 ] backaction cooling, [ 21 ] energy‐localization‐enhanced cooling, [ 22 ] dissipative cooling, [ 23,24 ] ground‐state cooling of magnomechanical resonator, [ 25 ] and the most widely applied resolved‐sideband cooling [ 26–35 ] and unresolved‐sideband cooling. [ 36–42 ]…”