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学习周光召先生的科学精神

科技导报 2024年第17期42卷 157-160页

作者：孙昌璞中国工程物理研究院研究生院北京100193

周光召先生是中国著名的物理学家,“两弹一星功勋奖章”获得者。他不仅在物理学基础研究方面取得了卓越成就,在国防科技领域也作出了重要贡献。担任科技行政领导职务期间,他对中国科技事业的改革发展和国际地位的提升发挥了关键作用。... 详细信息

周光召先生是中国著名的物理学家,“两弹一星功勋奖章”获得者。他不仅在物理学基础研究方面取得了卓越成就,在国防科技领域也作出了重要贡献。担任科技行政领导职务期间,他对中国科技事业的改革发展和国际地位的提升发挥了关键作用。周光召先生倡导学术民主,鼓励学术批评,强调求真唯实的科学精神,这些理念对中国科技创新和发展具有深远的现实意义。我们应传承光召先生求真唯实的科学精神,营造学术民主的氛围,“百花齐放、百家争鸣”,在自由开放的环境中展开学术讨论与批评,促进中国和全球科学事业的繁荣发展。

关键词：周光召科学精神学术民主学术批评

Deflection of an Atomic Beam in a Large Period Quantized Standing Light Wave

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Chinese Physics Letters 1994年第12期11卷 727-729页

作者： WANG Xiaoguang sun changpu Institute of Theoretical Physics Northeastern Normal UniversityChangchun 130024

By using the Wei-Norman's method,the deflection of an atomic beam with a large period quantized standing light wave is analyzed for the case with two-level atom and single-mode cavity *** is concluded that after passing through the standing light wave in cavity,the atomic beam is split into infinite beams symmetrically,and each momentum shift for a split component is proportional to the interaction *** is also shown that the output momentum distribution of atoms is sensitive to the statistical properties of the cavity field.

关键词： field. momentum split

HIGH-ORDER QUANTUM BERRY’S ADIABATIC PHASE AND ITS OBSERVABLE EFFECT

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Chinese Physics Letters 1989年第3期6卷 97-100页

作者： sun changpu Department of Physics Northeast Normal UniversityChangchun

New high-order adiabatic approximate method is proposed for the study of non-adiabatic evolution of a quantum system with slowly-changing *** corresponding high-order Berry’s adiabatic phases are used to describe the... 详细信息

关键词： adiabatic quantum Berry

CLASSICAL ANALOGUES OF QUANTUM BERRYS PHASE

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Chinese Physics Letters 1989年第11期6卷 481-483页

作者： sun changpu Physics Department Northeast Normal UniversityChangchun

With the classical generalized harmonic oscillator as an example,we show that the analogues of the quantum Berry's phase can appear in the classical mechanic systems with adiabatically-changing parameters,which have t... 详细信息

关键词： equations CLASS analogues

Dynamic generation of entangling wave packets in XY spin system with decaying long-range couplings

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Science China(Physics,Mechanics & Astronomy) 2008年第1期51卷 45-55页

作者： YANG Shuo SONG Zhi sun changpu Department of Physics Nankai UniversityTianjin 300071China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080China

The dynamic generation of spin entanglement between two distant sites in a XY model with 1/r 2 decay long-range couplings was *** to the linear dispersion relationε(k)~|k|of magnons in such a model,a well-located spin state can be dynamically split into two moving entangled local wave packets without changing their ***,when such two wave packets meet at the diametrically opposite site after the fast periodτ=Nπ/J,the initial well-located state is completely *** calculation was performed to confirm the analytical result even if the ring system of sizes N up to several thousands is *** truncation approximation for the coupling strengths was also *** simulation shows that the above conclusions still hold even if the range of the coupling strength is truncated to a relatively short scale compared with the size of the spin system.

关键词： quantum information entanglement spin model

A quantum solution to Gibbs paradox with few particles

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1727-1733页

作者： DONG Hui CAI ChengYun sun changpu Department of Chemistry University of CaliforniaBerkeleyCA 94720USA Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

We present a fully quantum solution to the Gibbs paradox (GP) with an illustration based on a gedanken experiment with two particles trapped in an infinite potential well. The well is divided into two cells by a solid wall, which could be removed for mixing the particles. For the initial thermal state with correct two-particle wavefunction according to their quantum statistics, the exact calculations show the entropy changes are the same for boson, fermion and non-identical particles. With the observation that the initial unmixed state of identical particles in the conventional presentations actually is not of a thermal equilibrium, our analysis reveals the quantum origin of the paradox, and confirms Jaynes' observation that entropy increase in Gibbs mixing is only due to the including more observables. To further show up the subtle role of the quantum mechanism in the GP, we study the different finite size effect on the entropy change and show the work performed in the mixing process is different for various types of particles.

关键词： Gibbs paradox identical particles mixing entropy

Spontaneous decoherence of coupled harmonic oscillators confined in a ring

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Science China(Physics,Mechanics & Astronomy) 2018年第4期61卷 17-29页

作者： ZhiRui Gong ZhenWei Zhang DaZhi Xu Nan Zhao changpu sun College of Physics and Energy Shenzhen UniversityShenzhen 518060China Beijing Computational Science Research Center Beijing 100084China Center for Quantum Technology Research School of PhysicsBeijing Institute of TechnologyBeijing 100081China

We study the spontaneous decoherence of coupled harmonic oscillators confined in a ring container, where the nearest-neighbor harmonic potentials are taken into consideration. Without any external symmetry-breaking field or surrounding environment, the quantum superposition state prepared in the relative degrees of freedom gradually loses its quantum coherence *** spontaneous decoherence is interpreted by the gauge couplings between the center-of-mass and the relative degrees of freedoms, which actually originate from the symmetries of the ring geometry and the corresponding nontrivial boundary *** particular, such spontaneous decoherence does not occur at all at the thermodynamic limit because the nontrivial boundary conditions become the trivial Born-von Karman boundary conditions when the perimeter of the ring container tends to *** investigation shows that a thermal macroscopic object with certain symmetries has a chance for its quantum properties to degrade even without applying an external symmetry-breaking field or surrounding environment.

关键词： spontaneous quantum decoherence periodic boundary condition gauge interaction

Fermion System with Quantum Group Symmetry and Usual Fermion Realizations of S1_(q)(2)

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Chinese Physics Letters 1992年第12期9卷 633-636页

作者： sun changpu LI Jianming Department of Physics Northeast Normal UniversityChangchun 130024 Department of Physics Jilin UniversityChangchun 130023

The usual fermion realizations of quantum algebra S1_(q)(2) defining higher-dimensional representations are built in this *** them,we construct a usual fermion system with quantum group symmetry of S1_(q)(2) as a q-deformation of the pairing correlation model in many-body *** energy spectra are exactly solved out from the representation theory of S1_(q)(2).

关键词： Fermi quantum usual

Thermodynamic witness of quantum probing

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Chinese Science Bulletin 2010年第29期55卷 3256-3260页

作者： DONG Hui LIU XuFeng sun changpu Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China Department of Mathematics Peking University Beijing 100871 China

The thermodynamic influence of quantum probing on an object is ***,quantum probing is understood to be a pre-measurement based on a non-demolition interaction,which records some information of the probed object but does not change its energy state when both the probing apparatus and the probed object are isolated from the *** is argued that when the probing apparatus and the probed object are immersed in the same equilibrium environment,the probing can affect the effective temperature of the object or induce a quantum isothermal process for the object to transfer its *** thermodynamic feature can be regarded as a witness of quantum probing.

关键词：热力学特性探测仪器量子能量转移等温过程有效积温环境