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第十八届全国量子光学学术会议

作者：刘奎 Jie Zhao Syed Assad ping koy lam 山西大学 Australian National University Centre for Quantum Computation and Communication Technology Department of Quantum ScienceResearch School of Physics and EngineeringThe Australian National University

Measurement-based quantum computation offers a particularly promising avenue for engineering a universal quantum computer. Intrinsic restriction arises from the in principle finite squeezing used to generate cluster states which induces noise during repeated application and reduces the fidelity of quantum operations. In this work, we construct and experimentally demonstrate a high fidelity quantum squeezing gate（SG） which is a prototype example of a measurement based quantum computer. A squeezing gate works by using an ancillary squeezed state to produce an output state that is a squeezed version of the input, and a filter function with an inverse Gaussian profile[1,2] is incorporated into the feedforward line. A significantly higher fidelity is therefore obtainable, at an expense of a finite success probability. We observed a squeezing fidelity of 98.49 for a target squeezing of-2.3 dB with only modest amount of ancilla squeezing, which would otherwise require 20.5 dB initial squeezing using a conventional deterministic SG. We emphasize that our SG scheme can be extended to realize other Gaussian operations with significantly higher fidelity than that is achievable using a conventional deterministic setup. We thus envisage this new SG diagram to be of great interest in continuous-variable fault-tolerant quantum computation as well as other protocols involving measurement and feedforward or feedback controls.

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Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit

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Light(Science & Applications) 2020年第1期9卷 907-919页

作者： Ankur Sharma Linglong Zhang Jonathan O.Tollerud Miheng Dong Yi Zhu Robert Halbich Tobias Vogl Kun Liang Hieu T.Nguyen Fan Wang Shilpa Sanwlani Stuart K.Earl Daniel Macdonald ping koy lam Jeffrey A.Davis Yuerui Lu Research School of Electrical Energy and Materials EngineeringCollege of Engineering and Computer ScienceThe Australian National UniversityCanberraACT 2601Australia Optical Sciences Centre Swinburne University of TechnologyHawthornVIC 3122Australia ARC Centre of Excellence for Future Low-Energy Electronics Technology Australia Centre for Quantum Computation and Communication Technology Department of Quantum ScienceResearch School of Physics and EngineeringThe Australian National UniversityActonACT 2601Australia School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Institute for Biomedical Materials and Devices(IBMD) Faculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia

Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing ***,most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities,as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in ***,by confining coherent excitons at the 2D quantum limit,we first observed molecular aggregation-enabled‘supertransport’of excitons in atomically thin two-dimensional(2D)organic semiconductors between coherent states,with a measured high effective exciton diffusion coefficient of ~346.9 cm^(2)/s at room *** value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic *** coupling to any optical cavities,the monolayer pentacene sample,a very clean 2D quantum system(~1.2 nm thick)with high crystallinity(J-type aggregation)and minimal interfacial states,showed superradiant emission from Frenkel excitons,which was experimentally confirmed by the temperature-dependent photoluminescence(PL)emission,highly enhanced radiative decay rate,significantly narrowed PL peak width and strongly directional in-plane *** coherence in monolayer pentacene samples was observed to be delocalised over~135 molecules,which is significantly larger than the values(a few molecules)observed for other organic thin *** addition,the supertransport of excitons in monolayer pentacene samples showed highly anisotropic *** results pave the way for the development of future high-speed excitonic circuits,fast OLEDs,and other optoelectronic devices.

关键词： transport quantum coherent

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极化空时自适应匹配滤波检测器

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电子学报 2013年第4期41卷 744-750页

作者：吴迪军徐振海张亮熊子源肖顺平国防科技大学电子科学与工程学院解放军95107部队

针对极化空时自适应处理时目标极化状态和杂波协方差矩阵未知等实际瓶颈问题,提出了一种适应于机载极化阵列雷达的极化空时自适应匹配滤波(PST-AMF)检测算法.该检测算法先利用回波数据估计目标的极化状态,然后再将估值代入似然比得到了... 详细信息

针对极化空时自适应处理时目标极化状态和杂波协方差矩阵未知等实际瓶颈问题,提出了一种适应于机载极化阵列雷达的极化空时自适应匹配滤波(PST-AMF)检测算法.该检测算法先利用回波数据估计目标的极化状态,然后再将估值代入似然比得到了新的检验统计量,进一步推导了检测器虚警概率和检测概率的解析表达式,从理论上证明了该检测方法具备恒虚警(CFAR)特性.该检测器计算量比极化空时广义似然比检测器(PST-GLRT)少,易于工程实现.最后,仿真验证了在检测慢速运动目标时,其性能优于单个通道的空时自适应匹配滤波检测器(ST-AMF),具备较强的稳健性.

关键词：极化阵列空时自适应处理极化空时自适应处理滤波检测

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我国城镇污水处理厂节能降耗研究现状及发展趋势

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水处理技术 2017年第6期43卷 1-4,10页

作者：郭昉吴毅晖李波李志平周平吴光学昆明滇池水务股份有限公司云南昆明650228 清华大学深圳研究生院深圳市环境微生物利用与安全控制重点实验室广东深圳518055

污水处理是一个能耗密集型行业,我国污水处理能耗约占社会用电能耗的0.3%,探究污水处理工艺的节能措施具有重要意义。随着我国污水处理厂建设的完善,未来对污水处理厂运行节能降耗需构建基于精细化管理和全程优化技术体系。现有工艺运... 详细信息

污水处理是一个能耗密集型行业,我国污水处理能耗约占社会用电能耗的0.3%,探究污水处理工艺的节能措施具有重要意义。随着我国污水处理厂建设的完善,未来对污水处理厂运行节能降耗需构建基于精细化管理和全程优化技术体系。现有工艺运行节能需立足全流程对关键工艺单元进行节能优化提升。开发新型污水处理工艺也是节能降耗的重要技术途径,尤其是基于厌氧生物处理的技术。污水处理数学模型与精确控制是精细化管理和节能实现的重要保障。构建节能降耗效能的综合评价方法与体系,有利于推动污水处理厂可持续发展。

关键词：节能全流程调控精细化管理可持续发展综合评价

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