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aleebrahim dehkordi E, kheirandish F. Super operator technique in Investigation of the purity of atom-field system in a dissipative cavity via an external classical laser field. ICOP & ICPET _ INPC _ ICOFS 2014; 20 :185-188
URL: http://opsi.ir/article-1-118-en.html
URL: http://opsi.ir/article-1-118-en.html
Abstract: (5746 Views)
Many protocols in quantum information processing require pure, maximally entangled quantum states. For example, quantum teleportation often relies heavily on the purity and entanglement of the initial state. The process of decoherence is a subject of great importance in quantum mechanics, particularly in the fields of quantum information. The interaction of the quantum system with the reservoir leads to the decay of quantum coherences and suppression of quantum effects. To investigate the dynamics of the quantum dissipative systems, not much attention has been given to the use of superoperator techniques. Master equations in atom-field interaction are usually studied by using Fokker–Planck and Langevin equations. In this paper, based on superoperator techniques, we investigate the purity of an atom-field system, which is additionally driven by a classical field, in a dissipative cavity. It is shown that the purity of the system can be improved by applying the classical field. Our results also show the elimination of the laser's effect in the presence of thermal photons.
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