检索结果-南通市图书馆

quantum public-key crypto via EPR pairs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 58-63页

作者： Xiang-Qun Fu Hong-Wei Li Jian-Hong Shi Tan Li Wan-Su Bao Henan Key Laboratory of quantum Information and Cryptography Information Engineering University Synergetic Innovation center of quantum Information and quantum Physics University of Science and Technology of China

With the development of quantum computing technology, quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key cryptography. This paper designs a quantum trapdoor one-way function via EPR pairs and quantum measurements. Based on this, a new quantum public-key cryptosystem is presented, which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext attack. Compared with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition, which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

Theory for frequent measurements of spontaneous emissions in a non-Markovian environment: Beyond the Lorentzian spectrum

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2019年第8期62卷 46-54页

作者： Luting Xu Xin-Qi Li center for joint quantum studies School of Science Tianjin University

The measurement-result-conditioned evolution of a system(e.g., an atom) with spontaneous emissions of photons is described by the quantum trajectory(QT) theory. In this work we generalize the associated QT theory from an infinitely wide bandwidth Markovian environment to the finite bandwidth non-Markovian environment. In particular, we generalize the treatment for an arbitrary spectrum, which is not restricted by the specific Lorentzian case. We rigorously prove the general existence of a perfect scaling behavior jointly defined by the bandwidth of the environment and the time interval between successive photon *** a couple of examples, we obtain analytic results to facilitate the QT simulations based on the Monte-Carlo algorithm. For the case where the analytical result is not available, a numerical scheme is proposed for practical simulations.

关键词： quantum measurement quantum trajectory Zeno effect non-Markovian environment

Understanding the local structure and thermophysical behavior of Mg-La liquid alloys via machine learning potential

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 439-449页

作者： Jia Zhao Taixi Feng Guimin Lu National Engineering Research center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China joint International Laboratory for Potassium and Lithium Strategic Resources East China University of Science and TechnologyShanghai 200237China

The local structure and thermophysical behavior of Mg-La liquid alloys were in-depth understood using deep potential molecular dynamic(DPMD) simulation driven via machine learning to promote the development of Mg-La alloys. The robustness of the trained deep potential(DP) model was thoroughly evaluated through several aspects, including root-mean-square errors(RMSEs), energy and force data, and structural information comparison results;the results indicate the carefully trained DP model is reliable. The component and temperature dependence of the local structure in the Mg-La liquid alloy was analyzed. The effect of Mg content in the system on the first coordination shell of the atomic pairs is the same as that of temperature. The pre-peak demonstrated in the structure factor indicates the presence of a medium-range ordered structure in the Mg-La liquid alloy, which is particularly pronounced in the 80at% Mg system and disappears at elevated temperatures. The density, self-diffusion coefficient, and shear viscosity for the Mg-La liquid alloy were predicted via DPMD simulation, the evolution patterns with Mg content and temperature were subsequently discussed, and a database was established accordingly. Finally, the mixing enthalpy and elemental activity of the Mg-La liquid alloy at 1200 K were reliably evaluated,which provides new guidance for related studies.

关键词： magnesium-lanthanum liquid alloys local structure macroscopic properties thermodynamic behavior deep potential mo-lecular dynamic simulation

Tightening the Penrose inequality

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第12期65卷 122-130页

作者： Hossein Khodabakhshi Hong Lü Run-Qiu Yang center for joint quantum studies Department of PhysicsSchool of ScienceTianjin UniversityTianjin300350China

The Penrose inequality estimates the lower bound of the mass of a black hole in terms of the area of its *** bound is relatively loose for extremal or near extremal black *** propose a new Penrose-like inequality for static black holes involving the mass,area of the black hole event horizon and *** inequality includes the Penrose inequality as its corollary,and it is saturated by both the Schwarzschild and Reissner-Nordstr?m black *** the spherically symmetric case,we prove this new inequality by assuming both the null and trace energy conditions.

关键词： black hole Penrose-like inequality trace energy condition

Degenerate black rings in D=5 minimal supergravity

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2021年第11期64卷 44-56页

作者： Shi-Fa Guo Hong Lu Yi Pang center for joint quantum studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China

We consider both gauged and ungauged minimal supergravities in five dimensions and analyse the charged rotating solutions with two equal angular momenta *** the electric charge Q∼J^(2/3) with some specific coefficient,we find new extremal black objects emerge that are asymptotic to either Minkowski or global AdS spacetimes and can be best described as degenerate black *** near-horizon geometry is locally AdS3×S^(2),where the periodic U(1)fibre coordinate in S 3 untwists and collapses to be the degenerate part of the AdS3 *** turns out that there are two branches of extremal rotating black holes,starting as the extremal RN black holes of the same mass,but opposite *** the increasing of the angular momentum,they will join to become the same degenerate black ring,where the Gibbs free energies however are not continuous at the *** the same Q(J)relation,we find that there is in addition a rotating soliton whose mass is smaller than that of the degenerate black ring.

关键词： supergravity higher-dimensional gravity black holes black rings thermodynamics

Cross correlation mediated by distant Majorana zero modes with no overlap

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 561-567页

作者： Lupei Qin Wei Feng Xin-Qi Li center for joint quantum studies and Department of Physics School of ScienceTianjin UniversityTianjin 300072China

Existing studies via shot noise calculation conclude that the cross correlation between the currents in the two leads connected by a pair of Majorana zero modes(MZMs)vanishes when their coupling energy𝜖∈_(M)→*** by the intrinsic nature of nonlocality of the MZMs,we revisit this important problem and propose an experimental scheme to demonstrate the nonvanishing cross correlation even at the limit𝜖∈_(M)→*** proposed scheme employs the Andreevprocess-associated branch circuit currents,which are theoretically obtained by applying a decomposition analysis for the total currents while are accessible directly in practical *** different bias voltage setup,we find intriguing results of both negative and positive correlations and carry out simple physical understanding using a quantum jump ***,combining together with the evidence of the zero-bias-peak of conductance,the nonlocal cross correlation predicted in this work can help to confirm the existence of the nonlocal MZMs.

关键词： Majorana zero modes cross correlation Andreev currents

Analytical formula describing the non-saturating linear magnetoresistance in inhomogeneous conductors

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第8期31卷 594-597页

作者： Shan-Shan Chen Yang Yang Fan Yang center for joint quantum studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China

The effective-medium theory(EMT)has proved successful in modeling the non-saturating linear magnetoresistance induced by ***,calculating magnetoresistance using the EMT usually involves solving coupled integral equations which have no analytical solutions,and therefore,it is still difficult to directly compare the predictions of EMT with experimental *** we demonstrate that the linear magnetoresistance predicted by the EMT can be either exactly formulated or well approximated by a simple analytical equationΔ_(ρ)/ρ_(0)=√k^(2)B^(2)+a^(2)-a in a number of known *** relations between the EMT parameters and the phenomenological parameters k and a are *** results provide a convenient and effective method for extracting the EMT parameters from experimental data.

关键词： linear magnetoresistance effective medium theory

PandaX-II set constraints to self-interacting dark matter usingthe full dataset

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2021年第11期64卷 8-9页

作者： Wan-Zhe Feng center for joint quantum studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China

In spite of the success of the cold dark matter(CDM)models working well at large scales,several discrepancies have arisen regarding CDM on galaxy *** of these are described as the cusp-core,diversity,missing satellites,and too-big-to-fail *** various suggestions to resolve some of these anomalies,the self-interacting dark matter(SIDM)[1]has attracted considerable attention in recent *** SIDM models allow for a fit to the astrophysical data and provide better agreement with galactic observations,where SIDM acts like collisional fluid at galaxy scales,see ref.[2]for a comprehensive review and references therein.

关键词： CDM galaxy Panda

Explaining the W boson mass anomaly and dark matter with a U(1) dark sector

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2023年第2期47卷 71-81页

作者：张凯煜冯万哲 center for joint quantum studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China

The W boson mass recently reported by the CDF collaboration shows a deviation from the standard model prediction with an excess at the 7σ *** investigate two simple extensions of the standard model with an extra U(1) dark *** is the U(1)xextension,where the U(1)xgauge field mixes with the standard model through gauge kinetic *** other is a general U(1)AY+Bqextension of the standard *** various experimental constraints,we find that the U(1)xextension with only kinetic mixing can enhance the W boson mass by10 MeV at *** U(1)AY+Bqextension can easily generate a 77 MeV enhancement of the Wboson mass and also offer a viable dark matter candidate with a mass ranging from several hundred GeV to TeV,which may be detected by future dark matter direct detection experiments with improved sensitivities.

关键词： dark matter hidden sector W boson mass