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Optik

Quantum dynamics of a couple cavity opto-mechanical system: Three mode & four mode entanglement

Kousik Mukherjee, Paresh Chandra Jana

Published Nov 23, 2018• 4 citations
Publisher
DOI
10.1016/j.ijleo.2018.11.078

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Abstract This study is based on a theoretical proposal for the generation and enhancement of multipartite entanglements of indirectly coupled modes using the coherent feedback loop scheme. The coherent feedback‐control mechanism that is presented here significantly improves the bipartite and tripartite entanglements among the indirectly coupled modes. The numerical study shows that the entanglements can be sufficiently tuned by the effective couplings and the reflective parameter of the beam splitter. In addition, the robustness and survival of the generated entanglement in the proposed system have shown to be significantly dependent on the reflectivity parameter. The existence of a genuine tripartite entanglement state in the dynamical state of the system is proven. Finally, the effect of the reflective parameter on three different tripartite entanglements is observed. The findings pave the way for tuning and enhancing multipartite entanglements of indirectly coupled modes in current cavity Opto‐magnomechanical systems and may have various vital applications in quantum information.
The Properties of light generated by V-type three-level laser in a doubly resonant opto-mechanical cavity coupled to squeezed vacuum reservoir have been studied. The atoms injected into the laser cavity are initially prepared in a coherent superposition of the two upper levels. Employing the expectation values of the cavity mode variables at steady state , the variances of quadratures and EPR-like variables of the cavity light modes have been determined. The results show that the two-mode cavity light exhibits squeezing in the minus quadrature and entanglement for small values of linear gain coefficient of the atom. The opto-mechanical coupling strength and cavity size diminish the squeezing and entanglement properties, even though these quantities have no effect on the mean photon number of the cavity modes. Moreover, 87.8% of quadrature squeezing below the vacuum state is obtained.