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العنوان
Optical Amplifier for Quantum Communication Systems /
المؤلف
Elemy,Hany.
هيئة الاعداد
باحث / Hany Elemy
مشرف / Mahmoud Hanafy Ahmed
مشرف / Tarek Abdel Azim Mohamed Ramadan
تاريخ النشر
2018
عدد الصفحات
114p.;
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة الكهربائية والالكترونية
تاريخ الإجازة
1/1/2018
مكان الإجازة
جامعة عين شمس - كلية الهندسة - هندسة الالكترونيات والاتصالات الكهربية
الفهرس
Only 14 pages are availabe for public view

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Abstract

The purpose of this thesis is to devise an innovative method to redeem one of the major challenges facing modern Quantum Communication networks, that is the problem of Quantum Amplification. We were primarily concerned with a specific type of Quantum Amplifiers, namely Noiseless Linear Amplifiers, where we think that these devices have more potential than the well-known nonlinear parametric amplifiers. However, Noiseless Linear Amplifiers suffer from some major drawbacks, the need for the highly sophisticated photon-number resolving detectors is a stumbling block in the face of realizing this technology, moreover, the impossibility of correcting the failed instances of the protocol is really crippling. In this thesis our main concern was to rectify these weaknesses, where we had been able to come up with a solution based on Cluster-State Quantum Computation that enhances the overall output of Noiseless Linear Amplifiers with less sophistication and the ability to correct errors.
This thesis is composed of five main chapters, in chapter 1, we began with a historical overview concerning the motivations behind Quantum Information Processing. In particular, the huge advantage promised over conventional classical information processing.
Active research topics like Quantum Key Distribution (QKD) and Noiseless Linear Amplifiers(NLA) were discussed briefly with the much paid attention to their advantages over their classical analogues.
In chapter 2 our main objective was to furnish the much needed background material to be able to conceive the subsequent chapters. At the beginning we gave a very short introduction to quantum optical communication systems, where the aim of this prelude is to prepare the unfamiliar reader for the next chapters.
Then we proceeded with motivating the need for a quantum theory of the electromagnetic field of radiation, subsequently we described the inner workings of the basic elements that will be used to manipulate these tiny pieces of matter, the single photons,. After that, we gave an axiomatic description of noisy communication channels that was general in nature to encompass any single-photon propagation problem. Finally we gave a brief overview of the idea of a cluster state that plays an important role when constructing our proposed model.
Chapter 3 began with describing the main ingredients of a quantum communication network. Firstly we started with discussing Quantum Amplifiers, by listing their different types, methodologies and the pros and cons concerning each type of them. After that, we did exactly the same thing with another equally important component of any Quantum Network, that is the Quantum Repeater.
Chapter 4 is the core heart of this thesis, where it expressed in great detail our novel approach to the problem of Noiseless Linear Amplification, then the culmination point of this chapter was when we introduced our constructed model that proved to be highly advantageous over the currently existing different approaches.
Chapter 5, the final chapter, involved our conclusion and our humble prediction for the possible future applications of our simple device. Furthermore, we introduced some interesting open problems, such as, state preparation and the effect of entanglement sudden-death on the success probability of any entanglement-based protocol.