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High-speed silicon photonic electro-optic Kerr modulation

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Photonics Research 2024年第1期12卷 51-60页

作者： JONATHAN PELTIER WEIWEI ZHANg LEOPOLD VIROT CHRISTIAN LAFFORgUE LUCAS DENIEL DELPHINE MARRIS-MORINI gUY AUBIN FARAH AMAR DENH TRAN XINgZHAO YAN callum g.littlejohns CARLOS ALONSO-RAMOS KE LI DAVID J.THOMSON gRAHAM REED LAURENT VIVIEN University Paris-Saclay CNRSCentre for Nanoscience and Nanotechnology(C2N)Palaiseau 91120France University grenoble Alpes CEALETIGrenoble 38000France Optoelectronics Research Centre Zepler Institute for Photonics and NanoelectronicsFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Silicon-based electro-optic modulators contribute to easing the integration of high-speed and low-power consumption circuits for classical optical communications and data *** the plasma dispersion modulation,an alternative solution in silicon is to exploit the DC Kerr effect,which generates an equivalent linear electro-optical effect enabled by applying a large DC electric *** some theoretical and experimental studies have shown its existence in silicon,limited contributions relative to plasma dispersion have been achieved in high-speed modulation so *** paper presents high-speed optical modulation based on the DC Kerr effect in silicon PIN *** contributions of both plasma dispersion and Kerr effects have been analyzed in different waveguide configurations,and we demonstrated that the Kerr induced modulation is dominant when a high external DC electric field is applied in PIN ***-speed optical modulation response is analyzed,and eye diagrams up to 80 gbit/s in NRZ format are obtained under a *** of 30 *** work paves the way to exploit the Kerr effect to generate high-speed Pockels-like optical modulation.

关键词： waveguide dispersion effect

Photoionisation detection of a single Er3+ ion with sub-100-ns time resolution

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National Science Review 2024年第4期11卷 38-45页

作者： Yangbo Zhang Wenda Fan Jiliang Yang Hao guan Qi Zhang Xi Qin Changkui Duan gabriele g.de Boo Brett C.Johnson Jeffrey C.Mc callum Matthew J.Sellars Sven Rogge Chunming Yin Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics and Engineering Australian National University

Efficient detection of single optical centres in solids is essential for quantum information processing, sensing and single-photon generation *** this work,we use radio-frequency（RF） reflectometry to electrically detect the photoionisation induced by a single Er3+ion in *** high bandwidth and sensitivity of the RF reflectometry provide sub-100-ns time resolution for the photoionisation *** this technique,the optically excited state lifetime of a single Er3+ion in a Si nano-transistor is measured for the first time to be 0.49±0.04μ*** results demonstrate an efficient approach for detecting a charge state change induced by Er excitation and *** approach could be used for fast readout of other single optical centres in solids and is attractive for large-scale integrated optical quantum systems thanks to the multi-channel RF reflectometry demonstrated with frequency multiplexing techniques.

关键词： single optical centres erbium ions RF reflectometry photoionisation detection

Addressing Frequency Control Challenges in Future Low-Inertia Power Systems:A great Britain Perspective

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Engineering 2021年第8期7卷 1057-1063页

作者： Qiteng Hong Md Asif Uddin Khan callum Henderson AgustíEgea-Àlvarez Dimitrios Tzelepis Campbell Booth Department of Electronic and Electrical Engineering University of StrathclydeGlasgow G11XWUK

The ambitious global targets on decarbonization present the need for massive integration of renewable generation in power systems,resulting in a significant decrease in the system *** addition to the reduction in system inertia,the transmission system in great Britain(gB)faces some unique challenges owing to its relatively small capacity,while being decoupled from other transmission systems and with the renewable resources largely non-uniformly distributed across the *** paper presents opinions and insights on the challenges associated with frequency control in a low-inertia system and the potential solutions from a gB *** this paper,we focus on three main techniques that act over different time scales:synchronous condensers,inertia emulation,and fast frequency *** evaluate their relative advantages and limitations with learnings from recent research and development projects in gB,along with the opinions on their roles in addressing the frequency control challenges in future low-inertia systems.

关键词： Fast frequency control Inertia emulation Synchronous compensation Low-inertia systems

All-silicon carrier accumulation modulator based on a lateral metal-oxide-semiconductor capacitor

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Photonics Research 2018年第5期6卷 373-379页

作者： KAPIL DEBNATH DAVID J.THOMSON WEIWEI ZHANg ALI Z.KHOKHAR callum littlejohns JAMES BYERS LORENZO MASTRONARDI MUHAMMAD K.HUSAIN KOUTA IBUKURO FREOERIC Y.gARDES gRAHAM T,REED SHINICHI SAITO Optoelectronics Research Centre University of SouthamptonSouthampton S017 1B JUK Faculty of Physical Sciences and Engineering University of SouthamptonSouthampton SO17 1BJUK

In silicon photonics, the carrier depletion scheme has been the most commonly used mechanism for demonstrat- ing high-speed electro-optic modulation. However, in terms of phase modulation efficiency, carrier- accumnlation-based devices potentially offer almost an order of carrier depletion. Previously reported accumulation modulator magnitude improvement over those based on designs only considered vertical metal-oxide- semiconductor （MOS） capacitors, which imposes serious restrictions on the design flexibility and integratability with other photonic components. In this work, for the first time to our knowledge, we report experimental demonstration of an all-silicon accumulation phase modulator based on a lateral MOS capacitor. Using a Mach-Zehnder interferometer modulator with a 500-μm-long phase shifter, we demonstrate high-speed modulation up to 25 gbit/s with a modulation efficiency （V πLπ） of 1.53 V·cm.

关键词： All-silicon carrier accumulation modulator a lateral metal-oxide-semiconductor capacitor

中国农户经营风险与借贷选择的关系研究--基于陕西的案例

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世界经济文汇 2009年第1期 70-79页

作者：孔荣 callum g.Turvey 西北农林科技大学经管学院 Department of Applied Economics and Management Cornell university

本文建立风险平衡模型,以陕西农户为例,研究农户经营风险与农户借贷选择间的关系。gLM模型回归结果显示,农户普遍使用非正规借贷方式获取资金;农户生产风险与农户使用借款之间存在显著的负相关关系;农户承担风险的态度和风险厌恶倾向以... 详细信息

本文建立风险平衡模型,以陕西农户为例,研究农户经营风险与农户借贷选择间的关系。gLM模型回归结果显示,农户普遍使用非正规借贷方式获取资金;农户生产风险与农户使用借款之间存在显著的负相关关系;农户承担风险的态度和风险厌恶倾向以及家庭收益对农户借贷选择的影响不显著。

关键词：经营风险借贷选择农户

Universal two-qubit quantum processing via large-scale silicon quantum photonics

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Universal two-qubit quantum processing via large-scale silic...

改善肌营养不良临床实验中快速脂肪分数的测量:起源和R2*改变的定量影响

第十八届全国量子光学学术会议

作者：强晓刚 Xiaoqi Zhou Jianwei Wang callum M.Wilkes Thomas Loke Sean O'gara Laurent Kling graham Marshall Raffaele Santagati Timothy C.Ralph Jingbo.B.Wang Jeremy.L.O'Brien Mark.g.Thompson Jonathan.C.F.Matthews 国防科技大学 National Innovation Institute of Defense Technology AMS Quantum Engineering Technology Labs H.H.Wills Physics Laboratory and Department of Electrical and Electronic EngineeringUniversity of Bristol School of Physics The University of Western Australia Centre for Quantum Computation and Communication Technology Department of Mathematical and PhysicsThe University of Queensland

Quantum computing generates much interest for its potential ability to outperform classical computing at many tasks. Photons have been considered as a promising candidate for implementing quantum computation owing to their properties of long coherence time, ease of manipulation and light-speed transmission. The integrated quantum photonic platform is an engineering solution proposed for robust and exquisite control of photonic quantum information by allowing generation, manipulation and detection of photons on a single chip. Here we use integrated silicon photonics and the linear combination of quantum operators scheme to realise a fully programmable two-qubit quantum processor, which enables universal two-qubit quantum information processing in optics for the first time. The device is fabricated with readily available CMOS based processing and comprises more than 200 photonic components, including 4 nonlinear photon-sources, 4 filters, 82 beam splitters and 58 individually addressable phase shifters. It allows to generate entangled photons and to initialise, operate and analyze arbitrary two-qubit states and processes on chip. To demonstrate performance, we programmed the device to implement 98 different two-qubit unitary operations（with average quantum process fidelity of 93.2±4.5%）, a two-qubit quantum approximate optimization algorithm and efficient simulation of Szegedy directed quantum walks. All results presented require about 100,000 experiment configurations. The chip performs with high fidelity, it is inherently stable and repeatable under continuous operation and it can be reprogrammed at k Hz rate, showing an ideal platform for quantum information processing applications. This fosters further use of the linear combination architecture with silicon photonics for future photonic quantum processors.

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国际医学放射学杂志 2015年第4期 377-377页

作者： T.Loughran D.M.Higgins M.Mc callum A.Coombs V.Straub K.g.Hollingsworth 孙超 Contract address:Newcastle Magnetic Resonance Centre Institute of Cellular Medicine Campus for Ageing and Vitality Newcastle University

摘要目的探讨R2*模型对正常个体及肌营养不良病人常规及快速骨骼肌脂肪分数测定的影响。材料与方法经纽卡斯尔和北泰恩赛德第2研究伦理委员会批准并签署知

关键词：脂肪分数营养不良 R2