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Oghbaei, Saeeid | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43232 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Sadighi Bonabi, Rasoul
Abstract:
Quantum interference and coherence could change the optical response of media and results several effect such as electromagnetically induced transparency (EIT), Lasing Without inversion (LWI) and optical nonlinearityenhancement.In Quantum Computing, by using Quantum coherence, one can producedecoherence free sub-space whichhasoutstandingapplications in this field.
In this work optical bistability behavior studied in two coupled quantum dots which resembles a three-level V type atomic system under influence of squeezed state reservoir. Spontaneously generated coherence (SGC) is responsible for Quantum interference. The squeezed state radiation could break the coherence in media and make the optical response of the systemto be phase dependent. Also the decaying coefficients due to dephasing process in quantum dots have been taken into account. Dephasing destructs the system’s coherence; however quantum interference could still enhance bistability behavior in several ways. Finally the population trapping into excited state has been considered for different magnitude of quantum interference. As a consequence,the coherent population trapping (CPT) could occur for maximum interference
Keywords:
Optical Bistability ; Quantum Dot ; Quantum Coherence ; Quantum Interference ; Squeezed State

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