臺灣博碩士論文加值系統

本論文是研究InGaAs/GaAs量子點分子於外加電場下之光學特性，利用該特性以外加電場操控分子態的排列，進而改變所表達的資訊，而達到量子資訊寫入目的。利用激子耦合光子與縱向光聲子，激子藉由縱向光聲子的吸收與放射，於基態與激發態之間來回振盪的特性。運用運動方程理論解析，得知基態與激發態之間的拉比振盪與激子起始分佈的關連。以該特性為基礎，藉由量測拉比振盪的特性而得到激子的分佈，進而達到量子資訊讀取的目的。此外，電場控制下激子躍遷率的劇烈變化的特性，亦提供場控制光放大倍率之光放大器，與場控制單光子源之應用。

This work presents the theory of exciton coupling to photons and LO phonons in quantum-dot molecules (QDMs). Resonant-round trips of the exciton between the ground (bright) and excited (dark or bright) states, mediated by the LO-phonon, alter the decay time and yield the Rabi oscillation. Novel schemes for a qubit reading/writing in an exciton-based quantum-dot-molecule (QDM) register are proposed. A bit of quantum information is coded into the superposition (molecule) states of the QDM, based on field-controllable combinations of these states. Population-dependent Rabi oscillation in QDMs provides a detectable signature for readout of quantum information that is stored in the register. Moreover, the field-convertibly optical transition rate of the molecule states promises the QDM system to be a field-controlled optical-gain switch or a field-controlled single-photon source.

摘 要 I
Abstract II
誌 謝 IV
目錄 VI
圖目錄 VII
第一章 緒論 1
1-1研究背景 1
1-2量子電腦 2
1-3量子計算與量子位元 4
1-4研究動機 8
第二章 量子資訊的寫入 10
2-1 基本架構 10
2-2 量子點分子中分子態的探討與量子資訊的寫入 15
第三章 量子資訊的讀取 21
3-1 運動方程理論(Theory of Equation of Motion) 21
3-2 漢彌頓量與運動方程的計算 22
3-3 量子資訊的讀取 30
第四章 結論 33
參考文獻 34

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