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انجمن اپتیک و فوتونیک ایران

The entanglement production between optical modes in optomechanical cavities

azadeh zare, Fardin Kheirandish, Najmeh Etehadi Abari

Published Feb 15, 2014• 0 citations
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Abstract

In this paper we put a suspended membrane inside a cavity, in such a way that this membrane play the role of a moveable mirror for each subcavity. We demonstrate that, the output modes of two subcavities are entangled and we analyze this entanglement by the steady-state covariance matrix of the system. We also study the effect of quality factor on this entanglement.

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In this paper we put a suspended membrane inside a cavity, in such a way that this membrane play the role of a moveable mirror for each subcavity. We demonstrate that, the output modes of two subcavities are entangled and we analyze this entanglement by the steady-state covariance matrix of the system. We also study the effect of quality factor on this entanglement.
The effective Hamiltonian of the optmechanical systems is similar to one that describes the interaction between a classical driving field and a single trapped cold ion. In this paper, by using this idea, generation and transfer of the entanglement state is investigated. In optomechanical systems with one and two membranes inside the cavity and in the Lamb-Dick approximation, with selecting mode the state transfer and the generation of two mode squeezed state between two membranes is considered. Also, the measure of entanglement in interaction to the thermal phonons and damping rate of cavity is computed.In this paper we try to describe our experimental or theoretical results. This abstract should be about 100 words.
We theoretically investigate the possibility to generate nonclassical states of optical and mechanical modes of optical cavities, distant from each other. A setup comprised of two identical cavities, each with one fixed and one movable mirror and coupled by an optical fiber, is studied in detail. We show that with such a setup there is potential to generate entanglement between the distant cavities, involving both optical and mechanical modes. The scheme is robust with respect to dissipation, and nonlocal correlations are found to exist in the steady state at finite temperatures.
In this paper, we show how continuous-variable dense coding can be implemented using entangled light generated from a membrane-in-the-middle geometry. The mechanical resonator is assumed to be a high reflectivity membrane hung inside a high quality factor cavity. We show that the mechanical resonator is able to generate an amount of entanglement between the optical modes at the output of the cavity, which is strong enough to approach the capacity of quantum dense coding at small photon numbers. The suboptimal rate reachable by our optomechanical protocol is high enough to outperform the classical capacity of the noiseless quantum channel.