Theoretical scheme for the realization of the sphere-coherent motional states in an atom-assisted optomechanical cavity

Abstract

A theoretical scheme for the realization of the sphere-coherent motional states in an optomechanical cavity in the presence of a two-level atom is proposed. To this end, the analogy between an atom-assisted optomechanical cavity and a laser-driven trapped-ion system is used. This analogy provides us with a theoretical tool to show how sphere-coherent states (SCSs) can be generated for the motional degree of freedom of the macroscopic mechanical oscillator (MO) from atom-field-mirror interactions in a multimode optomechanical cavity. Some nonclassical properties of the generated state of the MO, including the degree of quadrature squeezing and the negativity of the Wigner distribution, are studied. We also examine the effects of the dissipation mechanisms involved in the system under consideration, including the atomic spontaneous emission and the damping of the motion of the MO, on the generated motional SCSs. © 2015 Optical Society of America.