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Improving the optomechanical entanglement and cooling by photothermal force

Abdi, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.85.063839
  3. Publisher: 2012
  4. Abstract:
  5. Cooling and entanglement in optomechanical systems coupled through radiation pressure and photothermal force are studied. To develop the photothermal model, we derive an expression for deformation constant of the force. By exploiting linearized quantum Langevin equations, we investigate the dynamics of such systems. According to our analysis, in addition to separate action of radiation pressure and photothermal force, their cross-correlation effect plays an important role in the dynamics of the system. We also achieve an exact relation for the phonon number of the mechanical resonator in such systems, and then we derive an analytical expression for it at the weak-coupling limit. At the strong-coupling regime, we show that utilizing the photothermal pressure makes the ground-state cooling more approachable. The effect of photothermal force on the optomechanical entanglement is investigated in detail. According to our exact numerical and approximate analytical studies, even though the photothermal force is naturally a dissipative force, it can improve the optomechanical entanglement both quantitatively and qualitatively
  6. Keywords:
  7. Analytical expressions ; Cross correlations ; Dissipative forces ; Exact relations ; Mechanical resonators ; Optomechanical ; Optomechanical systems ; Phonon numbers ; Photo-thermal ; Photothermal pressure ; Quantum Langevin equations ; Radiation pressure ; Strong-coupling regime ; Weak-coupling limits ; Cooling ; Differential equations ; Dynamics ; Pressure ; Cooling systems
  8. Source: Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 85, Issue 6 , 2012 ; 10502947 (ISSN)
  9. URL: http://journals.aps.org/pra/abstract/10.1103/PhysRevA.85.063839