Effect of optomechanical coupling on squeezed-spin states

2nd International Symposium "Optics and its Applications"

Aggarwal, N.^1 ; Joshi, B.^2 ; Bhattacherjee, A.B.^3

Department of Physics and Astrophysics, University of Delhi, Delhi

110007, India^1

Department of Science and Technology, Technology Bhavan, New Mehrauli Road, New Delhi

110016, India^2

School of Physical Sciences, Jawaharlal Nehru University, New Delhi

110067, India^3

关键词: Atomic interactions;    Bose-Einstein condensates;    Coherent cavity field;    Coherent state;    Optomechanical cavities;    Pondermotive forces;    Radiation pressure;    Squeezed vacuum state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/672/1/012006/pdf
DOI  :  10.1088/1742-6596/672/1/012006

来源: IOP

【 摘 要 】

We investigate the effect of optomechanical coupling on the squeezed-spin states for a Bose-Einstein Condensate embedded within the lossless optomechanical cavity for the three special cases of initial states of cavity field, namely, a coherent state, a squeezed vacuum state and a squeezed state. We show that the radiation pressure or pondermotive force acting on the cavity end mirror plays a significant role in producing the atomic-squeezed states by producing squeezed states of the cavity field which is then transferred to the condensate. We further show that the maximum spin-squeezing along the x-direction is obtained in the presence of optomechanical coupling for the initial cavity field prepared in the amplitude squeezed state, whereas, squeezing along the y-direction reaches a maximum value in the absence of optomechanical coupling for the initial coherent cavity field. We also study the additional effect of nonlinear atomic interaction on spin-squeezing.