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Measures of imaginarity and quantum state order

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Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 26-35页

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

Complex numbers are widely used in classical and quantum ***,they play an important role in describing quantum systems and their dynamical ***,we propose several measures of the imaginarity of quantum states based on l1 norm and convex functions in the framework of resource ***,we investigate the quantum state order after a quantum system passes through a real *** proof shows that these proposed measures possess all the desirable properties for a measure of *** connection between the measure of imaginarity based on the l1 norm and the measure of imaginarity based on relative entropy is ***,we demonstrate that the l1 norm-based and the relative entropy-based measures of imaginarity are of the same order for qubit quantum *** we discuss the influences of the bit flip channel,phase damping channel,and amplitude flip channel on single qubit state order.

关键词： measure imaginarity quantum state order

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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： entangled states mutually unbiased measurements mutually unbiased bases general symmetric informationally complete POVMs

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 ***,a controlled quantum key distribution protocol is proposed using three four-level *** show that the two protocols are secure.

关键词： quantum key distribution four-level particles entanglement

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 *** relationships are ***,we describe the deterministic coherence dilution process by constructing blockincoherent *** 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

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 *** is an entangler for generating any one of the n-photon Greenberger-Horne-Zeilinger(GHZ)*** 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 *** second scheme discussed is an analyzer for multiphoton maximally entangled states,which is derived from the above *** this scheme,all of the 2nn-photon GHZ states can,nearly deterministically,be discriminated.

关键词： entangled photon entanglement generating coherent operations deterministic desired superposition optics

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 *** 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 *** 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 *** 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 *** work demonstrates a novel capability for longdistance quantum communication.

关键词： remote state preparation hyper-entanglement

Exact Results for the Low-Energy Excitations and the Phase Transition in Slot-Janssen 1D Modulated Crystals

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Chinese Physics Letters 1994年第4期11卷 223-226页

作者： ZHANG Degang yan fengli LI Bozang Institute of Solid State Physics Sichuan Normal UniversityChengdu 610066 Department of Physics Hebei Normal UniversityShijiazhuang 050016 Institute of Physics Academia SinicaBeijing 100080

The static low-energy excitations,their stability and the undistorted-incommensurate phase transition in Slot-Janssen one-dimensional(1D)modulated crystals are studied anew in *** exact results are obtained.

关键词： Transition distorted excitation

Detection of the quantum states containing at most k−1 unentangled particles

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Chinese Physics B 2021年第10期30卷 149-153页

作者： yan Hong Xianfei Qi Ting Gao fengli yan School of Mathematics and Science Hebei GEO UniversityShijiazhuang 050031China School of Mathematics and Statistics Shangqiu Normal UniversityShangqiu 476000China School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China College of Physics Hebei Normal UniversityShijiazhuang 050024China

There are many different classifications of entanglement for multipartite quantum systems,one of which is based on the number of the unentangled *** this paper,we mainly study the quantum states containing at most k−1 unentangled particles and provide several entanglement criteria based on the different forms of inequalities,which can both identify quantum states containing at most k−1 unentangled *** show that these criteria are more effective for some states by concrete examples.

关键词： multipartite entanglement k−1 unentangled particles Cauchy-Schwarz inequality

TUMOR NECROSIS FACTOR-ALPHA POLYMORPHISM AND SECRETION IN MYASTHENIA GRAVIS

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Chinese Medical Sciences Journal 2005年第2期20卷 104-107,页

作者： Yu-zhouGuan Li-yingCui yan-fengli Jun-baoZhang DepartmentofNeurology PekingUnionMedicalCollegeHospitalChineseAcademyofMedicalSciences＆PekingUnionMedicalCollegeBeijing100730

Objective To analyze the relationship between tumor necrosis factor-alpha (TNFα) gene promoter -308 polymorphism and myasthenia gravis (MG) in Chinese and analyze secretion of TNFα in peripheral blood mononuclear cells (PBMC) in MG patients. Methods A biallelic polymorphism at position -308 in the promoter of TNFα gene was screened by PCR amplification and NcoI recognition site. One hundred and twenty-three MG cases and 115 healthy controls were included in this study. MG patients were classified to different groups according to clinical type, age at onset, and sex respectively. PBMC were isolated from 20 patients and 20 healthy controls, and then cultured in the presence or absence of phytohemag- glutinin (PHA) and acetycholine receptors (AchR). The supernatants were harvested after incubation and stored until TNFα was assayed by enzyme-linked immunosorbent assay. Results The frequency of TNFα-308 allele 2 (A) was found significantly increase in MG patients and showed a trend especially in late onset (≥ 40 years) and male patients (P < 0.05). The allele A had no relationship with thymic pathogenesis in MG patients. But frequency of allele A was significantly higher in general type than in ocular type (P < 0.05). MG patients had a higher inducible level of TNFα by PHA and AchR, and could be down regulated after treatment. Conclusion Polymorphism in TNFα gene promoter -308 is associated with onset of MG. The microsatellite allele TNFα2 confer risk for the development of MG in Chinese patients. MG patients have a higher inducible level of TNFα.

关键词： myasthenia gravis tumor necrosis factor allele polymorphism