量子相干控制在纠缠态甄别中的应用及其它相关问题的理论研究
文献类型：学位论文
| 作者 | 钱军 |
| 学位类别 | 博士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 龚尚庆 |
| 关键词 | 量子相干控制 克尔非线性 偶极感应透明 纠缠态甄别 |
| 其他题名 | Theoretical investigation on the applications of quantum coherent control in entangled states discrimination and other related problems |
| 中文摘要 | 在迅速发展的量子信息与量子计算科学中，量子纠缠的产生、识别和应用始终是非常活跃的研究课题。寻找有效制备和分析量子纠缠态的方法对进一步的应用十分必要。此外，特殊环境噪声下的纠缠演化、非相干过程诱导相干以及微结构中的光与物质相互作用等问题的研究对深刻理解量子信息过程也非常重要。另一方面，量子相干控制已经在化学反应动力学、原子的光学特性控制和量子信息存储等方面得到广泛的应用。 因此，本论文细致讨论了量子相干控制在量子信息中应用及其它相关问题，主要研究成果如下： 1. 利用弱克尔非线性的量子非破坏测量原理提出了多光子广义Greenberger-HorneZeilinger (GHZ)态的甄别方案，所需要的弱非线性可以在目前实验水平下实现。 2. 提出利用偶极感应透明实现多粒子GHZ态制备和识别的方案。初始纠缠态在识别之后依然不受破坏，可用于后续其它任务。另外利用偶极感应透明还提出一个反复测量直至成功的量子计算方案。 3．针对压缩真空环境下无相互作用纠缠原子的纠缠动力学特性进行了研究，发现压缩真空的存在加速了纠缠的消失。同时分析了不同初始原子态的纠缠演化。 4．研究了近等间距阶梯型三能级原子系统的增益特性，发现自发辐射诱导相干使无反转增益显著增强。 5．研究了通过缺陷波导耦合的级联量子点-纳米微腔体系的光学透射性质，发现了复杂的多透射峰结构，利用简化的透射谱公式可得到不同参数条件下的透射峰的位置。 |
| 英文摘要 | In the rapidly developing field of quantum information and quantum computation, the generation, discrimination and applications of quantum entanglement are always active research topics. The investigation of new methods in which entanglement can be more effectively generated and analyzed is absolutely necessary for further applications. Moreover, the study of entanglement evolution under special environment noises, quantum coherence induced by decoherence and light-matter interaction in microstructures are also important for profound understanding of quantum information processing. On the other hand, quantum coherence control has led to applications ranging from chemistry reaction control to optical control of atoms and quantum memory. Therefore, in the thesis, some topics related to the applications of quantum coherent control in quantum information and some related problems are studied in detail. The main results are listed as follow: 1. A scheme is presented to discriminate an arbitrary universal multi-photon Greenberger-Horne-Zeilinger (GHZ) state using weak-Kerr-nonlinearity quantum nondemolition measurement (QND). The required weak nonlinearity is feasible at the present state of the art experimentally. 2. An efficient scheme to build and discriminate an arbitrary multi-particle GHZ state is proposed in the regime of dipole induced transparency (DIT) in a cavity-waveguide system. The initial entangled states are not destroyed after the measurement and can be used for successive tasks. Moreover, a repeat-until-success (RUS) measurement-based scheme for the implementation of quantum computation using DIT is also proposed. 3. Entanglement dynamics of non-interacting entangled atoms in squeezed vacuum is studied. It is found that entanglement sudden death is speeded up due to the existence of squeezed vacuum. Entanglement evolutions of different initial atomic states are also analyzed. 4. The effect of spontaneous generated coherence (SGC) on the property of the gain of the probe field in an equispaced three-level ladder atomic system is investigated. It is found that lasing without inversion (LWI) is remarkably enhanced and this results from atomic coherence generated by spontaneous emission. 5. The transmission property of the optical field in a cascade quantum-dot-nanocavity system side coupled to a defect waveguide in photonic crystals is studied and multi-peak structure under different parameters is found which can be explained by our simple formula. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15379]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 钱军. 量子相干控制在纠缠态甄别中的应用及其它相关问题的理论研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
入库方式： OAI收割
来源：上海光学精密机械研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。