| Item type |
学位論文 / Thesis or Dissertation(1) |
| 公開日 |
2010-02-22 |
| タイトル |
|
|
タイトル |
Distributed Hybrid Quantum Computing |
| タイトル |
|
|
タイトル |
Distributed Hybrid Quantum Computing |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_46ec |
|
資源タイプ |
thesis |
| 著者名 |
LOUIS, Sebastien Gerald Roland
|
| フリガナ |
セバスチャン, ルイス
|
| 著者 |
LOUIS, Sebastien Gerald Roland
|
| 学位授与機関 |
|
|
|
学位授与機関名 |
総合研究大学院大学 |
| 学位名 |
|
|
学位名 |
博士（情報学） |
| 学位記番号 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
総研大甲第1201号 |
| 研究科 |
|
|
値 |
複合科学研究科 |
| 専攻 |
|
|
値 |
17 情報学専攻 |
| 学位授与年月日 |
|
|
学位授与年月日 |
2008-09-30 |
| 学位授与年度 |
|
|
値 |
2008 |
| 要旨 |
|
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内容記述タイプ |
Other |
|
内容記述 |
There are numerous proposals for the physical realization of a quantum<br />computer. However, distributed approaches, making use both of flying and<br />stationary qubits, seem to constitute the most promising route towards a<br />truly scalable device. Such systems guarantee extendibility, they incorpo-<br />rate the interface with communication applications and relax the physical<br />realization of the device, allowing for defect tolerance. Flying qubits are<br />included in the more general concept of a quantum bus, a mediating sys-<br />tem which can be of higher dimension. Such a quantum bus can be used<br />in the straightforward preparation of a standard multi-qubit resource en-<br />abling measurement based quantum computation, the cluster state. This<br />constitutes the framework for the results presented in this thesis.<br /> We begin by investigating the effects of dissipation in the continuous<br />variable bus scheme known as the qubus scheme. By considering loss in the<br />bus as it mediates interactions between the stationary qubits, we obtain an-<br/>alytical results for the effective action of the induced quantum gate. We find<br />that a particular two-qubit gate operates with high fidelity in the presence<br />of moderate loss and give a simple iteration scheme to simplify the effects<br />of loss on the qubits. We then attempt to reduce these effects by preparing<br />the bus in more elaborate state, however no improvements are observed.<br /> We then apply the qubus scheme to the probabilistic generation of cluster<br />states and develop an entangling gate working with high success probability.<br />This allows us to produce cluster states far more efficiently than other pro-<br />posals. Investigating new methods to analyze the performance of different<br />generation strategies constitutes the second part of this set of results. We<br />begin by making the large flow approximation, used in queuing theory, to<br />obtain the optimal strategy in a regime with large resources. After what<br />we take the other more familiar limit of single cluster growth and introduce<br />absorbing Markov chains as a key mathematical tool.<br /> Finally we look at the transmission of composite quantum systems via a<br />single higher dimensional bus. We provide generalized protocols and inter-<br />actions guaranteeing a full transfer of the information from one composite<br />system to another. These protocols can also serve information process-<br />ing tasks, as useful logical operations can be applied to the data as it is<br />transfered. We notice lastly that the qubus scheme constitutes a potential<br />physical realization. |
| 所蔵 |
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|
値 |
無 |
| フォーマット |
|
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内容記述タイプ |
Other |
|
内容記述 |
application/pdf |
要旨・審査要旨 (293.5 kB)
