請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85392完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林俊達 | zh_TW |
| dc.contributor.advisor | Guin-Dar Lin | en |
| dc.contributor.author | 吳鈞季 | zh_TW |
| dc.contributor.author | Chun-Chi Wu | en |
| dc.date.accessioned | 2023-03-19T23:16:04Z | - |
| dc.date.available | 2023-11-10 | - |
| dc.date.copyright | 2022-08-15 | - |
| dc.date.issued | 2022 | - |
| dc.date.submitted | 2002-01-01 | - |
| dc.identifier.citation | [1] M. Saffman and T. G. Walker. Analysis of a quantum logic device based on dipole-dipole interactions of optically trapped rydberg atoms. Physical Review A, 72(2):022347, aug 2005.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85392 | - |
| dc.description.abstract | 中性原子是易於發展可擴展的量子訊息處理平台的物理系統之一。本論文主要提出一個新穎的方案:用於量子訊息處理系統的原子被由一維光學晶格(optical lattice)和拉蓋爾-高斯光束(Laguerre-Gaussian beam)組成的光阱(opticaltrap)傳輸。此研究成果展示了在中性原子平台的量子訊息處理系統實現連結性(connectivity)的潛能。我們首先研究此新穎光阱的性質，並展示雙量子位元糾纏閘（two-qubit entangling gate）作用於一顆靜止的原子和另一顆被此傳輸的原子(被稱為Drive-Through方法)。在雙量子位元糾纏閘中，其中一顆移動的原子被藍頻失諧(blue-detuned)一維光學晶格和拉蓋爾-高斯光束捕捉和傳輸，另一顆靜止的原子僅被光鑷捕捉。此Drive-Through方法被應用於兩個雙量子位元糾纏方案：雷德堡阻礙（Rydberg blockade）方案和全耦合（global coupling）方案。當原子溫度達到10 微開爾文(microkelvin)時，兩種方案的保真度階分別可以達到0 .99和
0 .999。主要的誤差來源如原子溫度，都卜勒效應(Doppler effect)和雷射強度誤差也在此論文中被分析。本論文亦研究策畫移動原子的行徑以避免加熱原子。伴隨著適當的傳輸軌跡，此過程僅激發少於0.001個聲子(phonon)。 | zh_TW |
| dc.description.abstract | In this work, we theoretically investigate a novel scheme of quantum information processing via atom transportation. The scheme is based on a one-dimensional blue-detuned optical lattice and a blue-detuned Laguerre-Gaussian beam. We first studied the property of the relevant optical trap architecture. The implementation of two-qubit entangling gates on one stationary atom and one flying atom transported by a moving optical lattice, called as Drive-Through (DT) method, is also demonstrated. The DT method is implemented with two two-qubit entangling gate schemes, the Rydberg blockade scheme and the global coupling scheme, with gate fidelity 0. 99 and 0. 999, respectively, when the atomic temperature is about 10 microkelvin. Error sources like finite temperature, the Doppler effect, and laser intensity deviation are analyzed. Movement manipulation of the flying atom to avoid heating while accelerating is also studied. After atomic movement are optimized, <0.001 phonons are excited. | en |
| dc.description.provenance | Made available in DSpace on 2023-03-19T23:16:04Z (GMT). No. of bitstreams: 1 U0001-1907202216120700.pdf: 2846963 bytes, checksum: 5363cd4ed1d1c81525252e0701606b8d (MD5) Previous issue date: 2022 | en |
| dc.description.tableofcontents | Certificate of thesis approval from the oral defense committee i
Acknowledgments iii Abstract (Mandarin) v Abstract (English) vii 1 Introduction 1 1.1 Atomic qubits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Rydberg atom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Mechanism of optical traps and laser beams . . . . . . . . . . . . . . . . 6 1.3.1 Optical tweezers and gradient force . . . . . . . . . . . . . . . . 6 1.3.2 Ponderomotive potential . . . . . . . . . . . . . . . . . . . . . . 7 1.3.3 Lauguerre-Gaussian beam . . . . . . . . . . . . . . . . . . . . . 8 1.4 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2 Quantum computation with neutral atoms 11 2.1 Interaction between atoms . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1.1 Dipole-dipole inteaction . . . . . . . . . . . . . . . . . . . . . . 12 2.1.2 Van der Waals interaction . . . . . . . . . . . . . . . . . . . . . 12 2.1.3 Rydberg blockade . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2 Quantum computing with Rydberg atoms . . . . . . . . . . . . . . . . . 15 2.2.1 Rydberg blockade scheme . . . . . . . . . . . . . . . . . . . . . 15 2.2.2 Global coupling scheme . . . . . . . . . . . . . . . . . . . . . . 18 2.3 Experimental progress in neutral atom quantum information processing . 20 3 Two-qubit gate implementation with the drive-through method 23 3.1 Blue-detuned optical traps . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.1.1 Blue-detune one-dimensional optical lattice . . . . . . . . . . . . 24 3.1.2 Additional Laguerre-Gaussian beam on optical lattice . . . . . . . 25 3.2 Optical trap properties . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.2.1 Trap properties for ground state atoms . . . . . . . . . . . . . . . 26 3.2.2 Trap properties for Rydberg-state atoms . . . . . . . . . . . . . . 27 3.3 Quantum gate scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.3.1 Rydberg blockade scheme . . . . . . . . . . . . . . . . . . . . . 30 3.3.2 Global coupling scheme . . . . . . . . . . . . . . . . . . . . . . 31 3.4 Error analysis and gate fidelity . . . . . . . . . . . . . . . . . . . . . . . 32 3.4.1 Position fluctuation of atoms in optical traps . . . . . . . . . . . . 32 3.4.2 Doppler dephasing error . . . . . . . . . . . . . . . . . . . . . . 34 3.4.3 Spontaneous emission and lifetime factors . . . . . . . . . . . . . 35 3.4.4 Laser intensity error . . . . . . . . . . . . . . . . . . . . . . . . 36 4 Heating effect from acceleration 37 4.1 Phonon generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.2 Acceleration process optimaization . . . . . . . . . . . . . . . . . . . . . 38 5 Conclusion 41 A Derivation 45 A.1 Average fidelity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 A.1.1 Fidelity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 A.1.2 Average fidelity over atomic positions . . . . . . . . . . . . . . . 45 A.1.3 Average fidelity over atomic doppler velocity . . . . . . . . . . . 46 Bibliography 47 | - |
| dc.language.iso | en | - |
| dc.subject | 擴充的架構 | zh_TW |
| dc.subject | 原子傳輸 | zh_TW |
| dc.subject | 雷德堡原子 | zh_TW |
| dc.subject | 量子電腦 | zh_TW |
| dc.subject | atom transport | en |
| dc.subject | quantum computer | en |
| dc.subject | scalable architecture | en |
| dc.subject | Rydebrg atoms | en |
| dc.title | 固定原子與傳輸原子量子位元的雙量子位元糾纏閘 | zh_TW |
| dc.title | Bypass entangling gate between a stationary and a flying neutral atom qubits | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 110-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 張銘顯;任祥華 | zh_TW |
| dc.contributor.oralexamcommittee | Ming-Shien Chang;Hsiang-Hua Jen | en |
| dc.subject.keyword | 擴充的架構,量子電腦,雷德堡原子,原子傳輸, | zh_TW |
| dc.subject.keyword | scalable architecture,quantum computer,Rydebrg atoms,atom transport, | en |
| dc.relation.page | 52 | - |
| dc.identifier.doi | 10.6342/NTU202201550 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2022-07-25 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 物理學系 | - |
| dc.date.embargo-lift | 2023-07-31 | - |
| 顯示於系所單位： | 物理學系 | |
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