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中国科学:物理学 力学 天文学（英文版）
中国科学:物理学 力学 天文学（英文版）

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中国科学:物理学 力学 天文学（英文版）/Journal Science China(Physics, Mechanics&Astronomy)CSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Experimental quantum state compression from two identical qubits to a qutrit

    Qiao XuLin-Xiang ZhouTian-Feng FengShang-Feng Qiu...
    1-5页
    查看更多>>摘要：In the realm of modern information technology,data compression technology occupies a pivotal position.With advancements in quantum information technology,the need to compress large-scale qubits ensembles has become urgent,aiming to reduce the demand on quantum storage resources.However,existing quantum state compression schemes generally face a limitation:the particles before and after compression must reside in the same dimensional space.In specific scenarios,compressing qubits into particles of higher dimensions not only enhances the efficiency of quantum state compression but also further reduces the usage of quantum storage resources.Here we experimentally demonstrated a quantum state compression between particles of different dimensions,successfully compressing two qubits into a single qutrit.The average fidelity of the resulting qutrit with the ideal quantum state is 0.8835.Our study may have potential applications in future quantum information,such as increasing quantum communication bandwidth and reducing storage resource consumption in quantum computing.
      原文链接:
    • 万方数据
    • 维普

    Implementation of integrated nonlocal sensing for object shape and rotational speed

    Zhenyu GuoYunlong WangZehong ChangJiawei Wang...
    6-12页
    查看更多>>摘要：The expeditious acquisition of information pertaining to objects through the utilization of quantum technology has been a peren-nial issue of concern.So far,the efficient utilization of information from dynamic objects with limited resources remains a significant challenge.Here,we realize a nonlocal integrated sensing of the object's amplitude and phase information by combin-ing digital spiral imaging with the correlated orbital angular momentum states.The amplitude information is utilized for object identification,while the phase information enables us to determine the rotational speed.We demonstrate the nonlocal identifi-cation of a rotating object's shape,irrespective of its rotational symmetry,and introduce the concept of the correlated rotational Doppler effect,establishing a fundamental connection between this effect and the classical rotational Doppler effect,i.e.,that both rely on extracting crucial information from the spiral spectrum of objects.The present study highlights a promising pathway towards the realization of quantum remote sensing and imaging.
      原文链接:
    • 万方数据
    • 维普

    Security of quantum key distribution with virtual mutually unbiased bases

    Hong-Wei LiChen-Peng HaoZhi-Jiang ChenLi Gong...
    13-21页
    查看更多>>摘要：In a perfect quantum key distribution(QKD)protocol,quantum states should be prepared and measured with mutually unbiased bases(MUBs).However,in a practical QKD system,quantum states are generally prepared and measured with imperfect MUBs using imperfect devices,possibly reducing the secret key rate and transmission distance.To analyze the security of a QKD system with imperfect MUBs,we propose virtual MUBs to characterize the quantum channel against collective attack,and analyze the corresponding secret key rate under imperfect state preparation and measurement conditions.More generally,we apply the ad-vantage distillation method for analyzing the security of QKD with imperfect MUBs,where the error tolerance and transmission distance can be sharply improved.Our analysis method can be applied to benchmark and standardize a practical QKD system,elucidating the security analysis of different QKD protocols with imperfect devices.
      原文链接:
    • 万方数据
    • 维普

    General formalism for dirty extreme-mass-ratio inspirals

    Ye JiangWen-Biao Han
    22-29页
    查看更多>>摘要：Detecting the environment around the supermassive black holes and tests of general relativity are important applications of extreme-mass-ratio inspirals(EMRIs).There is still a challenge to efficiently describe various"dirty"impacts on the inspirals,such as dark matter,gas,dipole radiation,and electromagnetic interaction.In this study,we find the inherent linearity of the asymptotic solution of the inhomogeneous Teukolsky equation.On the basis of this property,we completely decouple the factors of the perturber and the background spacetime in the energy fluxes and waveforms.With the new decoupling form,the waveforms of EMRIs with non-geodesic motion in Kerr spacetime can be conveniently calculated.This will help to resolve the environment(including gas,field,dark matter,electromagnetic interaction)around supermassive black holes and test general relativity.
      原文链接:
    • 万方数据
    • 维普

    New black-to-white hole solutions with improved geometry and energy conditions

    Zhongwen FengYi LingXiaoning WuQingquan Jiang...
    30-43页
    查看更多>>摘要：We construct new black-to-white hole solutions which connect the geometry of spacetime at some gluing surface inside the hori-zon.The continuity of the metric can be guaranteed up to the arbitrary order which is controlled by the power factor n.This sort of black-to-white holes is characterized by the sub-Planckian scalar curvature,independent of the mass of black-to-white holes.More importantly,we show that the energy condition is only violated within a small region near the gluing surface.The geodesics of particles within the region from black hole to white hole is also analyzed.It turns out that the matter falling into the black hole may pass through the center without singularity and come out from the white hole.This scenario provides novel ideas for understanding the information loss paradox in traditional black hole physics.
      原文链接:
    • 万方数据
    • 维普

    Quasi-2D weak lensing cosmological constraints using the PDF-SYM method

    Zhenjie LiuJun ZhangHekun LiZhi Shen...
    44-58页
    查看更多>>摘要：Cosmic shear statistics,such as the two-point correlation function(2PCF),can be evaluated with the PDF-SYM method instead of the traditional weighted-sum approach.It makes use of the full PDF information of the shear estimators,and does not require weightings on the shear estimators,which can in principle introduce additional systematic biases.This work presents our con-straints on S8 and Ωm from the shear-shear correlations using the PDF-SYM method.The data we use is from the z-band images of the Dark Energy Camera Legacy Survey(DECaLS),which covers about 10000 deg2 with more than 100 million galaxies.The shear catalog is produced by the Fourier_Quad method,and well tested on the real data itself with the field-distortion effect.Our main approach is called quasi-2D as we do use the photo-z information of each individual galaxy,but without dividing the galaxies into redshift bins.We mainly use galaxy pairs within the redshift interval between 0.2 and 1.3,and the angular range from 4.7 to 180 arcmin.Our analysis yields S8=0.762±0.026 and Ωm=0.234±0.075,with the baryon effects and the intrinsic alignments included.The results are robust against redshift uncertainties.We check the consistency of our results by deriving the cosmological constraints from auto-correlations of γ1 and γ2 separately,and find that they are consistent with each other,but the constraints from the γ1 component are much weaker than that from γ2 It implies a much worse data quality of γ1,which is likely due to additional shear uncertainties caused by CCD electronics(according to the survey strategy of DECaLS).We also perform a pure 2D analysis,which gives S8=0.81+0.03-0.04 and Ωm=0.25+0.06-0.05.Our findings demonstrate the potential of the PDF-SYM method for precision cosmology.
      原文链接:
    • 万方数据
    • 维普

    Is Yang-Mills theory unitary in fractional spacetime dimensions?

    Qingjun JinKe RenGang YangRui Yu...
    59-64页
    查看更多>>摘要：We present concrete evidence that Yang-Mills theory exhibits non-unitarity in non-integer spacetime dimensions.This violation of unitarity stems from evanescent operators that,while vanishing in four dimensions,are non-zero in general d dimensions.We demonstrate that these evanescent operators lead to the emergence of both negative-norm states and complex anomalous dimensions.
      原文链接:
    • 万方数据
    • 维普

    Principal components of nuclear mass models

    Xin-Hui WuPengwei Zhao
    65-71页
    查看更多>>摘要：Principal component analysis(PCA)is employed to extract the principal components(PCs)present in nuclear mass models for the first time.The effects from different nuclear mass models are reintegrated and reorganized in the extracted PCs.These PCs are recombined to build new mass models,which achieve better accuracy than the original theoretical mass models.This comparison indicates that using the PCA approach,the effects contained in different mass models can be collaborated to improve nuclear mass predictions.
      原文链接:
    • 万方数据
    • 维普

    A polarized 3He system based on metastability-exchange optical pumping

    Yuting WangLiangyong WuKaiyuan ZhangMei Peng...
    72-81页
    查看更多>>摘要：Hyperpolarized 3He nuclei have emerged as a significantly important approach in quantum precision measurement techniques,with extensive applications in fundamental physics,magnetometry,metrology,and beyond.In this study,we report on the design and implementation of a 3He polarization system at the China Mianyang Research Reactor(CMRR),utilizing the metastability-exchange optical pumping(MEOP)method.We employed a Merritt coil system consisting of four square coils to furnish a uniform holding field.We deployed a 2 W fiber laser to pump the metastable 3He atoms and conducted free induction decay(FID)detection of the polarized 3He nuclei using both pickup coil and optical methods.For the optical method,we used a 50 mW linearly polarized distributed Bragg reflector(DBR)laser as the probe.We applied transverse light absorption polarime-try to measure the absolute nuclear polarization of the ground-state 3He.We have developed cell fabrication capabilities at the CMRR,and cells at various pressures ranging from 100 to 1000 Pa have been fabricated and evaluated.For a typical borosilicate cell with 100 Pa pressure,the absolute polarization is measured as Pn ≈ 70％,and the transverse relaxation time is estimated as T2 ≈ 0.5 s.Moreover,we constructed a few aluminosilicate cells,each carefully filled with pure 3He at a pressure of 100 Pa.Subsequently,we conducted a comprehensive evaluation of their performance in the context of MEOP.
      原文链接:
    • 万方数据

    Switching,explosion,and chaos of multi-wavelength soliton states in ultrafast fiber lasers

    Zhi-Zeng SiYue-Yue WangChao-Qing Dai
    82-90页
    查看更多>>摘要：Because of the complexity and difficulty of realizing a multi-wavelength soliton state,reports on its internal dynamic char-acteristics are scarce.In this study,the switching and periodic soliton explosion processes of the multi-wavelength soliton state in a negative dispersion passively mode-locked fiber laser are realized.The generation of the multi-wavelength soliton state undergoes the process of noise,oscillation,and stable mode-locking,and the splitting and annihilation of solitons with different group velocities directly impact the generation and disappearance of three wavelengths.Positive and negative dispersion lead to different group velocities of solitons.The presence and displacement of solitons with different group velocities cause soliton collisions,which lead to soliton explosions.A soliton experiences relative phase oscillation,chaos,and oscillation,as well as convergence and separation before and after an explosion.With an increase in parameters related to pump power,single-soliton oscillation,multi-wavelength solitons,and chaos are found in experiments and simulations,proving the relevance and reliability between simulation and experimental results.This work promotes the dynamical study of multi-soliton collisions in nonlinear science and the development of chaos theory in multi-comb lasers.
      原文链接:
    • 万方数据
    • 维普