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Measuring small longitudinal phase shifts via weak measurement amplification

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Chinese Physics B 2024年第3期33卷 105-111页

作者：徐凯胡晓敏胡孟军王宁宁张超黄运锋柳必恒李传锋郭光灿张永生 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Beijing Academy of Quantum Information Sciences Beijing 100193China

Weak measurement amplification,which is considered as a very promising scheme in precision measurement,has been applied to various small physical quantities *** many physical quantities can be converted into phase signals,it is interesting and important to consider measuring small longitudinal phase shifts by using weak ***,we propose and experimentally demonstrate a novel weak measurement amplification-based small longitudinal phase estimation,which is suitable for polarization *** realize one order of magnitude amplification measurement of a small phase signal directly introduced by a liquid crystal variable retarder and show that it is robust to the imperfection of ***,we analyze the effect of magnification error which is never considered in the previous works,and find the constraint on the *** results may find important applications in high-precision measurements,e.g.,gravitational wave detection.

关键词： weak measurement phase estimation quantum optics

Simultaneous observation of quantum contextuality and quantum nonlocality

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Science Bulletin 2018年第17期63卷 1092-1095页

作者： Xiao-Min Hu bi-heng liu Jiang-Shan Chen Yu Guo Yu-Chun Wu Yun-Feng Huang Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of science and Technology of China Hefei 230026 China

Quantum nonlocality and quantum contextuality are the most curious properties that change our understanding of nature, and were observed independently in recent decades. One important question is whether both properties can be observed simultaneously. In this paper, we show that in a qutrit-qutrit system we can observe quantum nonlocality and quantum contextuality at the same time. From the perspective of quantum information, our experiment proves in principle that the two resources, quantum nonlocality and quantum contextuality, can be utilized simultaneously.

关键词： Quantum contextuality Quantum nonlocality Monogamy Qutrit-qutrit system

Experimental investigation of measurement incompatibility of mutually unbiased bases

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Chip 2023年第1期2卷 51-57页

作者： Yu Guo Shuming Cheng Xiao-Min Hu bi-heng liu Yun-Feng Huang Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Tech-nology of ChinaHefei 230026China CAS Center For Excellence in Quan-tum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China The Department of Control Science and Engineer-ing Tongji UniversityShanghai 201804China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 201804China Institute for Advanced Study Tongji UniversityShanghai 200092China

Incompatible measurements are of fundamental importance to re-vealing the peculiar features of quantum theory,and are also use-ful resources in various quantum information *** this work,we investigate the quantum incompatibility of mutually unbiased bases(MUBs)within the operational framework of quantum resource the-ory,and report an experimental validation via the task of state *** particular,we construct an experimentally friendly witness to detect incompatible MUBs,based on the probability of cor-rectly discriminating quantum ***,we prove that the noise robustness of MUBs can be retrieved from violating the above ***,we experimentally test the incompatibility of MUBs of dimensionality ranging from 2 to 4,and demonstrate that it is more robust to noise,as either the dimensionality of measurements or the number of MUBs *** results may aid the exploration of the essential roles of incompatible measurements in both theoretical and practical applications in quantum information.

关键词： Quantum incompatibility Mutually unbiased bases Robust-ness of incompatibility

Experimental observation of quantum nonlocality in general networks with different topologies

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Fundamental Research 2021年第1期1卷 22-26页

作者： Chao Zhang Huan Cao Yun-Feng Huang bi-heng liu Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026People’s Republic of China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026People’s Republic of China

Nonlocal correlation plays an important role in device independent quantum information *** stan-dard Bell nonlocality has been well studied with single local hidden variables,however the nonlocal correlations in general networks with several independent quantum sources and distant observers have been far less ***,by using three independent entangled photon sources and recently constructed nonlinear Bell inequalities,we experimentally test the nonlocal correlations in the network scenario with different *** violation of the inequalities can be obtained simply with separate measurements,which is much more favourable from the practical point of *** experiment results show a violation as 0.7779±0.0093 for the star network,and 0.7303±0.0024 for the chain ***,we demonstrate that more measurement settings for each observer can bound more information against an eavesdropper.

关键词： Quantum nonlocality Quantum network Polynomial Bell inequality

Experimental entanglement quantification for unknown quantum states in a semi-device-independent manner

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Science China(Information Sciences) 2023年第8期66卷 72-79页

作者： Yu GUO Lijinzhi LIN Huan CAO Chao ZHANG Xiaodie LIN Xiao-Min HU bi-heng liu Yun-Feng HUANG Zhaohui WEI Yong-Jian HAN Chuan-Feng LI Guang-Can GUO CAS Key Laboratory of Quantum Information University of Science and Technology of China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China School of Physics and Materials Engineering Hefei Normal University Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Vienna Center for Quantum Science and Technology Faculty of Physics University of Vienna Yau Mathematical Sciences Center Tsinghua University

Using the concept of non-degenerate Bell inequality, we show that quantum entanglement, the critical resource for various quantum information processing tasks, can be quantified for any unknown quantum state in a semi-device-independent manner, where the quantification is based on the experimentally obtained probability distributions and prior knowledge of the quantum dimension only. Specifically, as an application of our approach to multi-level systems, we experimentally quantify the entanglement of formation and the entanglement of distillation for qutrit-qutrit quantum systems. In addition, to demonstrate our approach for multi-partite systems, we further quantify the geometric measure of entanglement of three-qubit quantum systems. Our results supply a general way to reliably quantify entanglement in multi-level and multi-partite systems, thus paving the way to characterize many-body quantum systems by quantifying the involved entanglement.

关键词： entanglement quantification semi-device-independent bell nonlocality multi-partite system multi-level system

Experimental one-step deterministic polarization entanglement purification

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Science Bulletin 2022年第6期67卷 593-597,M0003页

作者： Cen-Xiao Huang Xiao-Min Hu bi-heng liu Lan Zhou Yu-Bo Sheng Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China

Entanglement purification is to distill high-quality entangled states from low-quality entangled *** is a key step in quantum repeaters,determines the efficiency and communication rates of quantum communication protocols,and is hence of central importance in long-distance communications and quantum *** this work,we report the first experimental demonstration of deterministic entanglement purification using polarization and spatial mode *** purification,the fidelity of polarization entanglement arises from 0.268±0.002 to 0.989±*** with robust spatial mode entanglement,the total purification efficiency can be estimated as 10^(9) times that of the entanglement purification protocols using two copies of entangled states when one uses the spontaneous parametric down-conversion *** work may have the potential to be implemented as a part of full repeater protocols.

关键词： Quantum entanglement Hyperentanglement Quantum communication Deterministic entanglement purification Quantum repeater

On-chip path encoded photonic quantum Toffoli gate

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Photonics Research 2022年第7期10卷 1533-1542页

作者： MENG LI CHU LI YANG CHEN LAN-TIAN FENG LINYU YAN QIAN ZHANG JUEMING BAO bi-heng liu XI-FENG REN JIANWEI WANG SHUFENG WANG YUNAN GAO XIAOYONG HU QIHUANG GONG YAN LI State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-Optoelectronics Peking UniversityBeijing 100871China Key Laboratory of Quantum Information CAS University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

The quantum Toffoli gate is one of the most important three-qubit gates,but it is challenging to construct a chip according to the complicated traditional *** the optimized 3D configuration with an overpass waveguide to reduce the circuit complexity,we successfully fabricate an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing(FLDW)for the first time to our knowledge,whose truth-table fidelity is higher than 85.5%.Furthermore,a path encoded four-qubit controlled-controlled-controlled NOT gate is written to confirm the scalability of this resource-saving *** work paves the way for the FLDW of more complex and powerful photonic quantum computation chips.

关键词： technique quantum configuration

PbrARF4 contributes to calyx shedding of fruitlets in ‘Dangshan Suli’ pear by partly regulating the expression of abscission genes

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Horticultural Plant Journal 2024年第2期10卷 341-354页

作者： Guoling Guo Pengfei Wei Tao Yu Haiyan Zhang Wei heng Lun liu Liwu Zhu bing Jia School of Horticulture Anhui Agricultural UniversityHefeiAnhui 230036China Huayuan Foreign Language School Zhejiang Normal UniversityJinhuaZhejiang 322100China Agricultural Experimental Center of Guiyang Guiyang Agriculture and Rural BureauGuiyangGuizhou 550018China

Fruitlet calyx shedding in pear plants is apparently regulated via numerous pathways that involve both environmental triggers and phytohormones cues such as auxin. In this study, we found at 10 days after full bloom (DAFB) higher levels of indoleacetic acid (IAA) and tryptophan (Trp) in calyx persistence fruitlet (CPF) than calyx shedding fruitlet (CSF) ofDanshan Suli’ pear (Pyrus bretschneideri Rhed.). Consisting with this, the activity of indolealdehyde oxidase (IAAIdO), which promotes IAA synthesis, was remarkably increased, and that of peroxidase(POD), which degrades IAA, dropped markedly in CPF but not in CSF. Further, qRT-PCR results revealed that most of 31 PbrARFs (encoding auxin response factors) in Pyrus bretschneideri were highly expressed in CPF, whereas PbrARF4, PbrARF24 and PbrARF26 were significantly downregulated in CPF vis-a-vis CSF. Phylogenetic analysis revealed that 6 PbrARFs clustered in the group III, where PbrARF4 showed the closest affinity with AtARF1 that promotes organ abscission, indicating a putative role of PbrARF4 in mediating the process of calyx shedding in pear. In fact, the ectopic overexpression of PbrARF4 in Solanum lycopersicum resulted in an earlier-formed and deeper abscission layer (AL) in the transgenic plants, whose calyxes were more prone to wilt at the mature red stage (MR) compared with the control plants (wild-type). More importantly, expression levels of the abscission genes SILS and Sl Cel2 in transgenic plants overexpressing PbrARF4 were significantly upregulated in comparation with the WT, whereas those of Sl bi and Sl TAPG2 were considerably inhibited. Further, PbrJOINTLESS and PbrIDA,the two genes related to calyx shedding in pear, were up-regulated more in CSF than CPF. The findings contribute to a better understanding of PbrARFs involved in fruitlet calyx shedding of pear, which could prove beneficial to improving the quality of pear fruit.

关键词： Pear Pyrus bretschneideri Rehd Calyx shedding IAA PbrARF4 Abscission genes

Beating the channel capacity limit for superdense coding with entangled ququarts

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Beating the channel capacity limit for superdense coding wit...