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Block-coherence measures and coherence measures based on positive-operator-valued measures

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Communications in Theoretical Physics 2022年第2期74卷 51-59页

作者： Liangxue Fu fengli yan Ting Gao College of Physics Hebei Key Laboratory of Photophysics Research and ApplicationHebei Normal UniversityShijiazhuang 050024China School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China

We study block-coherence measures based on the resource theory of block-coherence and coherence measures based on positive-operator-valued measures(POVM).Several blockcoherence measures are presented,including the block-coherence measure based on maximum relative entropy,the one-shot block-coherence cost under maximally block-incoherent operations,and the coherence measure based on coherent rank.Their relationships are obtained.Moreover,we describe the deterministic coherence dilution process by constructing blockincoherent operations.Based on the POVM coherence resource theory,we also propose two coherence measures and analyze their relationship.

关键词： coherence measure block-coherence measure positive-operator-valued measure

Transformations of multilevel coherent states under coherence-preserving operations

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 35-40页

作者： LiMei Zhang Ting Gao fengli yan School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China Department of Mathematics and Computer Science Hengshui UniversityHengshui 053000China College of Physics Hebei Key Laboratory of Photophysics Research and ApplicationHebei Normal UniversitsShijiazhuang 050024China

Quantum coherence,emerging from the"superposition"of quantum states,is widely used in various information processing tasks.Recently,the resource theory of multilevel quantum coherence is attracting substantial attention.In this paper,we mainly study the transformations of resource pure states via free operations in the theoretical framework for multilevel coherence.We prove that any two multilevel coherent resource pure states can be interconverted with a nonzero probability via a completely positive and trace non-increasing k-coherence-preserving map.Meanwhile,we present the condition of the interconversions of two multilevel coherent resource pure states under k-coherence-preserving operations.In addition,we obtain that in the resource-theoretic framework of multilevel coherence,no resource state is isolated,that is,given a multilevel coherent pure state|ψ>,there exists another multilevel coherent pure state|Φ>and a k-coherence-preserving operation∧k,such that∧k(|Φ>)=|ψ>.

关键词： multilevel coherent state k-coherence-preserving operation interconversion of two multilevel coherent resource pure states

Separability criteria via some classes of measurements

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 1-6页

作者： Lu Liu Ting Gao fengli yan College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050024 China College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang 050024 China

Mutually unbiased bases (MUBs) and symmetric informationally complete (SIC) positive operator-valued measurements (POVMs) are two related topics in quantum information theory. They are generalized to mutually unbiased measurements (MUMs) and general symmetric informationally complete (GSIC) measurements, respectively, that are both not necessarily rank 1. We study the quantum separability problem by using these measurements and present separability criteria for bipartite systems with arbitrary dimensions and multipartite systems of multi-level subsystems. These criteria are proved to be more effective than previous criteria especially when the dimensions of the subsystems are different. Furthermore, full quantum state tomography is not needed when these criteria are implemented in experiment.

关键词：可分性判据测量量子信息理论多体系统层析成像全对称子系统正算子

Remote preparation for single-photon state in two degrees of freedom with hyper-entangled states

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Frontiers of physics 2021年第4期16卷 65-73页

作者： Mei-Yu Wang fengli yan Ting Gao College of Physics Hebei Normal UniversityShijiazhuang 050024China School of Mathematics Science Hebei Normal UniversityShijiazhuang 050024China Hebei Key Laboratory of Photophysics Research and Application Shijiazhuang 050024China

Remote state preparation(RSP)provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement.In this paper,we study RSP of an arbitrary single-photon state in two degrees of freedom(DoFs).Using hyper-entanglement as a shared resource,our first goal is to remotely prepare the single-photon state in polarization and frequency DoFs and the second one is to reconstruct the single-photon state in polarization and time-bin DoFs.In the RSP process,the sender will rotate the quantum state in each DoF of the photon according to the knowledge of the state to be communicated.By performing a projective measurement on the polarization of the sender’s photon,the original single-photon state in two DoFs can be remotely reconstructed at the receiver’s quantum systems.This work demonstrates a novel capability for longdistance quantum communication.

关键词： remote state preparation hyper-entanglement

Experimental research on spray and combustion characteristics of the third generation conical spray

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Journal of Marine Science and Application 2005年第1期4卷 44-49页

作者： fengli-yan LONGWu-qiang DUBao-guo TIANhua OBOKATATomio DepartmentofPowerEngineering DalianUniversityofTechnologyChinaDalian116023China DepartmentofMechanicalSystemEngineering GunmaUniversityKiryu376-8515Japan

A new generation conical spray system for conventional diesel engines or premixed combustion diesel engines is introduced. By means of oriented impingement method, flexible spray penetration in design is realized. High-speed photograph was used to investigate the spatial distribution characteristics of the new spray for cases of different impingement angles and needle valve opening pressures. The results show that, by applying spray impingement orientation, fuel jets spread along the cone surface as shape of sectors, so the dispersion of jets is increased obviously. Changing on impingement angle leads to variation of penetration, which is critical in homogeneous mixture preparation. Due to the flexibility of spray penetration in design, the spray impingement on liner is avoided in a great extent. The results also indicate that higher needle valve opening pressure results in longer penetration and larger spray angle after impingement. Combustion characteristics of the impinged conical spray were studied in the 1135 type diesel engine. The new impinged conical spray system work smoothly in full load range with better fuel economy and lower emissions of NOx and soot than the original test engine.

关键词：冲击溅射高速摄影柴油机压缩点火

Quantum key distribution using four-level particles

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Chinese Science Bulletin 2011年第1期56卷 24-28页

作者： yan Tao yan fengli College of Physics Science and Information Engineering Hebei Normal UniversityShijiazhuang 050016China Hebei Advanced Thin Films Laboratory Shijiazhuang 050016China

We present a quantum key distribution protocol based on four-level particle entanglement.Furthermore,a controlled quantum key distribution protocol is proposed using three four-level particles.We show that the two pro... 详细信息

关键词： quantum key distribution four-level particles entanglement

Entangler and analyzer for multiphoton Greenberger-Horne-Zeilinger states using weak nonlinearities

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2098-2103页

作者： DING Dong yan fengli GAO Ting College of Physics Science and Information Engineering Hebei Normal University Department of Basic Curriculum North China Institute of Science and Technology College of Mathematics and Information Science Hebei Normal University

In the regime of weak nonlinearity we present two general,feasible schemes for manipulating photon states.One is an entangler for generating any one of the n-photon Greenberger-Horne-Zeilinger(GHZ)states.Interactions of the incoming photons with crossKerr media followed by a phase shift gate and a measurement on a probe beam plus appropriate local operations using classical feed-forward of the measurement results allow one to obtain the desired states in a nearly deterministic manner.The second scheme discussed is an analyzer for multiphoton maximally entangled states,which is derived from the above entangler.In this scheme,all of the 2nn-photon GHZ states can,nearly deterministically,be discriminated.

关键词：弱非线性多光子分析仪格林测定结果 GHZ态最大纠缠态状态

A measure of multipartite entanglement with computable lower bounds

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A measure of multipartite entanglement with computable lower...

Permutationally Invariant Part of a Density Matrix and Nonseparability of N-Qubit States

第十六届全国量子光学学术报告会

作者： yan Hong Ting Gao fengli yan College of Mathematics and Information Science Hebei Normal University College of Physics Science and Information Engineering Hebei Normal University

＜正＞In this paper,we present a measure of multipartite entanglement（k-nonseparable）,k-ME concurrence Ck-ME（ρ）that unambiguously detects all k-nonseparable states in arbitrary dimensions,where the special case,2-ME concurrence C2-ME（ρ）,is a measure of genuine multipartite entanglement.The new measure k-ME concurrence satisfies

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Permutationally Invariant Part of a Density Matrix and Nonse...