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Simple Procedure for Entanglement Transformation of Bipartite Pure States

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Communications in Theoretical Physics 2008年第3期49卷 652-654页

作者： WU Chun-Wang chen ping-xing LI cheng-Zu Department of Applied Physics National University of Defense Technology Changsha 410073 China

An explicit procedure for transforming one bipartite entangled state into another via local operations and classical communication （LOCC） is presented. Our procedure is much simper than the previous ones in the sense that, it only involves two steps and the explicit expression of local general measurement used in the procedure can be obtained by solving a set of linear equations. Furthermore, this procedure is still applicable in high dimensional case.

关键词： procedure entanglement transformation bipartite pure states linear equations

A New Approach to the Quantum Adiabatic Condition

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Chinese Physics Letters 2012年第10期29卷 5-8页

作者： GUO Chu DUAN Qian-Heng chen ping-xing Department of Physics National University of Defense TechnologyChangsha 410073 State Key Laboratory of High Performance Computing National University of Defense TechnologyChangsha 410073

The quantum adiabatic theorem is the basis of adiabatic quantum ***,the exact necessary and sufficient conditions for adiabatic evolution are still under *** discuss the adiabatic condition of a system undergoing a special evolution route,and obtain an explicit formula that is necessary and sufficient for the adiabatic evolution in this *** on this formula,we find that the traditional adiabatic condition is neither sufficient nor ***,we show that no adiabatic process can occur even the evolution speed goes to 0 in some examples,which is surprising since the adiabatic theorem states that if the evolution of a system is slow enough,the adiabatic process could occur.

关键词： computation adiabatic quantum

A Configurable Surface-Electrode Ion Trap Design for Quantum Information Processing

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Chinese Physics Letters 2013年第12期30卷 33-36页

作者： LIU Wei chen Shu-Ming chen ping-xing WU Wei College of Computer National University of Defense TechnologyChangsha 410073 Science and Technology on PDL National University of Defense TechnologyChangsha 410073 College of Science National University of Defense TechnologyChangsha 410073

We propose a configurable surface-electrode ion trap design to alleviate the poor reusability of the existing *** can architecturally and electrically support 5 mainstream modes by design reuse,thus enhancing the trap reusability and reducing the experiment setup *** also develop a corresponding simulation suite which can optimize trap geometries and calculate trap parameters to control the trapped ion's classic *** to our analytical and simulated results,the configurable design can serve as a unified platform for basic research of large-scale quantum information processing.

关键词： architectural Quantum unified

An Alternative Approach to Construct the Initial Hamiltonian of the Adiabatic Quantum Computation

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Chinese Physics Letters 2013年第1期30卷 9-12页

作者： DUAN Qian-Heng ZHANG Shuo WU Wei chen ping-xing Department of Physics National University of Defense TechnologyChangsha 410073 State Key Laboratory of High Performance Computing National University of Defence TechnologyChangsha 410073

The adiabatic quantum computation(AQC)has been proven to be equivalent to the standard circuit ***,AQC evolves from the initial Hamiltonian which has a uniform equal superposition of the computational basis to the final Hamiltonian whose ground state encodes the solution to a computation *** propose an alternative approach to construct the initial Hamiltonian of the AQC which has an unequal superposition of the possible solutions to the problem and show that an educated guess can improve the performance of AQC.

关键词： problem. Hamiltonian superposition

Generation of Atomic Cluster State via Adiabatic Evolution of Dark Eigenstates

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Communications in Theoretical Physics 2008年第10期50卷 974-978页

作者： chen Ju-Mei LI cheng-Zu LIANG Lin-Mei chen ping-xing DAI Hong-Yi Department of Physics National University of Defense Technology Changsha 410073 China

We propose a scheme to generate atomic cluster states of arbitrary configuration in the cavity quantumelectrodynamics (QED) *** process is achieved via adiabatic evolution of dark states,which only requiresadiabatically increasing or decreasing Rabi frequencies of *** it allows the robust implementation of entanglementagainst certain types of *** scheme is relatively decoherence-free in the sense that excited atomic states are neverpopulated and excited cavity photon states can be made negligible in certain conditions.

关键词： cluster state cavity QED dark state decoherence-free static phase difference

Relative Entropy of Entanglement of One Class of Two-Qubit system

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Chinese Physics Letters 2001年第3期18卷 325-327页

作者： LIANG Lin-Mei chen ping-xing LI cheng-Zu HUANG Ming-Qiu Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of ChinaHefei 230026 Department of Applied Physics National University of Defense TechnologyChangsha 410073 CCAST(World Laboratory)P.O.Box 8730 Beijing 100080

The relative entropy of entanglement of a mixed stateσfor a bipartite quantum system can be defined as the minimum of the quantum relative entropy over the set of completely disentangled *** et al.[***.A 57(1998)1619]have recently proposed a numerical method to get the relative entropy of entanglement Ere for two-qubit *** paper shows that the convex programming method can be applied to calculate Ere of two-qubit systems analytically,and discusses the conditions under which the method can be adopted.

关键词： entropy system quantum

The Second Law of Thermodynamics in a Quantum Heat Engine Model

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Communications in Theoretical Physics 2006年第3期45卷 417-420页

作者： ZHANG Ting CAI Li-Feng chen ping-xing LI cheng-Zu Department of Applied Physics,National University of Defence Technology,Changsha 410073,Chinachen ping-xing Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China Department of Applied Physics National University of Defence Technology Changsha 410073 China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China

The second law of thermodynamics has been proven by many facts in classical *** there any newproperty of it in quantum world?In this paper,we calculate the change of entropy in ***’s model for quantumheat engine(QHE)and prove the broad validity of the second law of *** is shown that the entropy ofthe quantum heat engine neither decreases in a whole cycle,nor decreases in either stage of the *** second lawof thermodynamics still holds in this QHE ***,although the modified quantum heat engine is capable ofextracting more work,its efficiency does not improve at *** is neither beyond the efficiency of ***’s initialmodel,nor greater than the reversible Carnot efficiency.

关键词： second law of thermodynamics entropy quantum heat engine

Change of Accessory Genital Glands Markers in the Patients with Oligoasthenospermia

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Journal of Reproduction and Contraception 2009年第4期20卷 217-221页

作者： Shun-mei DENG Ren-qian WEN Mei-yi LIU Yan-jia JIANG Shun-jie MA Ai-ping chen Li-xing TANG Guangdong Family Planning Institute Guangzhou 510600 China

Objective To evaluate the effect of the accessory gential gland on the male fertility. Methods The relevant seminal parameters of 32 normal donors and 35 patients with olioasthenospermia were measured by seminal routine analysis, sperm morphology and accessory, gentital glands markers.Results The percentage of normal spermatozoa, the function of sperm penetration through cervical mucus and the enzyme activity of neutral α-1,4-glucosidase significantly declined as compared with the control. There was a significant negative relationship between the semen volume and the sperm motility for the oligoasthenospermia （r= -0.415, P〈0.05）, and a significant positive relationship between the sperm count and the percentage of normal sperm （r=0.393, P〈0.05）.Conclusion The abnormal function of epididymis exists in patients with oligoasthenospermia. Sperm function,for the oligoasthenospermia declines with an increase of the percentage of the abnormal sperm. The poorer the spermatogenises function of the testis is, the higher the percentage of the abnormal sperm appears.

关键词： oligoasthenospermia fructose neutral α-1,4-glucosidase acid phosphatase sperm morphology

Exploring the potential of extrachromosomal DNA as a novel oncogenic driver

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Science China Life Sciences 2025年第1期68卷 144-157页

作者： Huanbo Zhu Longtao Huangfu Junbing chen Jiafu Ji Xiaofang xing Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Division of Gastrointestinal Cancer Translational Research LaboratoryPeking University Cancer Hospital & Institute Department of Gastrointestinal Cancer Center Peking University Cancer Hospital & Institute Department of Liver Surgery & Transplantation Liver Cancer InstituteZhongshan HospitalFudan University Key Laboratory of Carcinogenesis and Cancer Invasion Ministry of Education State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers Beijing Key Laboratory of Carcinogenesis and Translational ResearchDivision of Gastrointestinal Cancer Translational Research LaboratoryPeking University Cancer Hospital & Institute

Extrachromosomal DNA(ecDNA) is a form of circular DNA mostly found in tumor cells. Unlike the typical chromosomal DNA, ecDNA is circular, self-replicating, and carries complete or partial gene fragments. Although ecDNA occurrence remains a rare event in cancer, recent studies have shown that oncogene amplification on ecDNA is widespread throughout many types of cancer, implying that ecDNA plays a central role in accelerating tumor evolution. ecDNA has also been associated with increased tumor mutation burden, chromosomal instability, and even tumor microenvironment remodeling. ecDNA may be crucial in influencing tumor heterogeneity, drug sensitivity,oncogenic senescence, and tumor immunogenicity, leading to a worsening prognosis for tumor patients. In this way, several clinical trials have been conducted to investigate the importance of ecDNA in clinical treatment. In this review, we summarize the biogenesis, characteristics, and current research methods of ecDNA, discuss the vital role of ecDNA-caused tumor heterogeneity in cancers, and highlight the potential role of ecDNA in cancer therapy.

关键词： extrachromosomal DNA cancer therapy tumor heterogeneity drug resistance tumor evolution