检索结果-南通市图书馆

基于d-wave Advantage的量子退火公钥密码攻击算法研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计算机学报 2024年

作者：王潮王启迪洪春雷胡巧云裴植上海大学特种光纤与光接入网重点实验室

d-wave专用量子计算机的原理量子退火凭借独特的量子隧穿效应可跳出传统智能算法极易陷入的局部极值，可视为一类具有全局寻优能力的人工智能算法.本文研究了两类基于量子退火的RSA公钥密码攻击算法(分解大整数N=pq)，一是将密码攻击数... 详细信息

d-wave专用量子计算机的原理量子退火凭借独特的量子隧穿效应可跳出传统智能算法极易陷入的局部极值，可视为一类具有全局寻优能力的人工智能算法.本文研究了两类基于量子退火的RSA公钥密码攻击算法(分解大整数N=pq)，一是将密码攻击数学方法转为组合优化问题或指数级空间搜索问题，通过Ising模型或QUBO模型求解，提出了乘法表的高位优化模型，建立新的降维公式，使用d-wave Advantage分解了200万整数2269753.大幅度超过普渡大学、Lockheed Martin和富士通等实验指标，且Ising模型系数h范围缩小了84%，系数J范围缩小了80%，极大的提高了分解成功率，这是一类完全基于d-wave量子计算机的攻击算法.二是基于量子退火算法融合密码攻击数学方法优化密码部件的攻击，采用量子退火优化CVP问题求解，通过量子隧穿效应获得比Babai算法更近的向量，提高了CVP问题中光滑对的搜索效率，在d-wave Advantage上实现首次50比特RSA整数分解.实验表明，在通用量子计算机器件进展缓慢情况下，d-wave表现出更好的现实攻击能力，且量子退火不存在NISQ量子计算机VQA算法的致命缺陷贫瘠高原问题：算法会无法收敛且无法扩展到大规模攻击.

关键词： RSA d-wave 量子退火 CVP

The role of intraoperative neurophysiological monitoring in intramedullary spinal cord tumor surgery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2024年第1期10卷 57-66页

作者： Kai Liu Chengyuan Ma dapeng Li Haisong Li Xuechao dong Bo Liu Ying Yu Yuxiang Fan Hongmei Song department of Neurosurgery Bethune First Hospital of Jilin UniversityChangchunJilinChina

Intramedullary tumors are a class of central nervous system tumors with an incidence of 2 to 4%.As they are located very deep and frequently cause postoperative neurological complications,surgical resection is difficult.In recent years,many surgeons have performed electrophysiological monitoring to effectively reduce the occurrence of post-operative neurological complications.Modern electrophysiological monitoring technology has advanced considerably,leading to the development of many monitoring methods,such as SSEPs,MEPs,dCM,and EMG,to monitor intramedullary tumors.However,electrophysiological monitoring in tumor resection is still being studied.In this article,we discussed the different monitoring methods and their role in monitoring intramedullary tumors by reviewing previous studies.Intratumorally tumors need to be monitored for a summary of the condition of the patient.Only by using various monitoring methods flexibly and through clear communication between surgeons and neurophysiological experts can good decisions be made during surgery and positive surgical results be achieved.

关键词： Intramedullary spinal cord tumor Intraoperative neurophysiological monitoring d-wave

Zeeman effects on d-wave superconductor and tunneling spectrum in normal-metal/d-wave superconductor tunnel junction

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2006年第5期49卷 597-605页

作者： dONG Zhengchao department of Physics Huaiyin Teachers CollegeJiangsu Province Key Laboratory for Chemistry of Low-Dimensional MateeialsHuai'an 223001China

We study the Zeeman effect on the d-wave superconductor and tunneling spectrum in normal-metal(N)/d-wave superconductor(S) junction by applying a Zeeman magnetic field to the S. It is shown that: (1) the Zeeman magnetic field can lead to the S gap decreasing, and with the increase in Zeeman energy, the superconducting state is changed to the normal state, exhibiting a first-order phase transition; (2) the Zeeman magnetic field may make the zero-bias conductance peak split into two peaks, and the energy difference between the two splitting peaks in the conductance spectrum is equal to 2h0 (h0 is the Zeeman energy); (3) both the barrier strength of interface scattering and the temperature can lower the magnitudes of splitting peaks, of which the barrier strength can lead to the splitting peaks becoming sharp and the temperature can smear out the peaks, however, neither of them can influence the Zeeman effect.

关键词： Zeeman effects d-wave superconductor tunneling spectrum

Charge Channel Mechanism for d-wave Superconductivity

在线全文

学校读者我要写书评

暂无评论

电子显微学报 1997年第4期 103-106页

作者： d.Z.Liu\ K.Levin (James Franck Institute, University of Chicago, Chicago, IL 60637)

ＣｈａｒｇｅＣｈａｎｎｅｌＭｅｃｈａｎｉｓｍｆｏｒｄｗａｖｅＳｕｐｅｒｃｏｎｄｕｃｔｉｖｉｔｙＤ．Ｚ．ＬｉｕＫ．Ｌｅｖｉｎ（ＪａｍｅｓＦｒａｎｃｋＩｎｓｔｉｔｕｔｅ，ＵｎｉｖｅｒｓｉｔｙｏｆＣｈｉｃａｇｏ，Ｃｈｉｃ... 详细信息

ＣｈａｒｇｅＣｈａｎｎｅｌＭｅｃｈａｎｉｓｍｆｏｒｄｗａｖｅＳｕｐｅｒｃｏｎｄｕｃｔｉｖｉｔｙＤ．Ｚ．ＬｉｕＫ．Ｌｅｖｉｎ（ＪａｍｅｓＦｒａｎｃｋＩｎｓｔｉｔｕｔｅ，ＵｎｉｖｅｒｓｉｔｙｏｆＣｈｉｃａｇｏ，Ｃｈｉｃａｇｏ，ＩＬ６０６３７）Ａｂｓｔｒ...

关键词： d-wave Superconductivity Charge Mechanism Channel

Unconventional chiral d-wave superconducting state in strained graphene

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第11期28卷 326-332页

作者：徐峰张磊 department of Physics Jiangxi Normal UniversityNanchang 330022China department of Physics Shaanxi University of TechnologyHanzhong 723001China

We consider a highly unconventional superconducting state with chiral d-wave symmetry in doped graphene under strain with the Gutzwiller–RVB method in the momentum space. It is shown that flat bands emerge in the normal state for reasonable strain. As a result, the superconducting critical temperature is found to be linearly proportional to the strength of the electron–electron interaction. Furthermore, the chiral d-wave superconducting state is shown with coexistence of the charge density wave and the pair density wave. There are different coexisting states with those orders under different doping levels.

关键词： chiral d-wave superconducting state pair density wave flat band doped graphene

Quest towards “factoring larger integers with commercial d-wave quantum annealing machines”

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2019年第6期62卷 130-130页

作者： XinMei Wang School of Telecommunications Engineering Xidian University

Integer factorization (IFP), also called prime factorization, is an important problem in number theory, cryptography, and quantum computation. Factoring large integers to attack the RSA cryptosystem is intractable for powerful supercomputers, let alone classical computers. In 1994, Shor [1]presented an algorithm that potentially enabled a quantum computer to find prime factors in polynomial time.

关键词： Quest towards factoring larger integers with commercial d-wave quantum annealing machines

A New Approach to the Ground State of Superfluid Fermi Gas near the Feshbach Resonance of d-wave

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2012年第2期3卷 151-154页

作者： Alireza Heidari Mohammadali Ghorbani Institute for Advanced Studies Tehran Iran

The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.2, 151-154, 2012, has been removed from this site.

关键词： d-wave Coupling Superfluid Gap Equation Ground State

d-wave量子计算机,到底能不能进行量子计算

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

科技导报 2015年第24期33卷 118-119页

作者：雨遇

最近Google宣布在量子计算领域取得了突破性进展,他们用d-wave量子计算机（图1）在解决某些问题上比传统计算机过程快了1亿倍。果真这样,它将带来人工智能技术的巨大进步。不过,有专家对此表示质疑,认为这些说法夸大其词了。那么Google... 详细信息

最近Google宣布在量子计算领域取得了突破性进展,他们用d-wave量子计算机（图1）在解决某些问题上比传统计算机过程快了1亿倍。果真这样,它将带来人工智能技术的巨大进步。不过,有专家对此表示质疑,认为这些说法夸大其词了。那么Google所谓的d-wave量子计算机,到底能不能做量子计算,这1亿倍的加速又是怎么回事？

关键词：量子计算机 d-wave 人工智能技术量子比特模拟退火量子相干性全局极小值量子器件运算速度量子隧穿

Effects of dopamine d_(1) receptor blockade on the ERG b- and d-waves during blockade of ionotropic GABA receptors

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2016年第1期3卷 245-252页

作者： Elka Popova Momchil Kostov Petia Kupenova department of Physiology Medical University of SofiaSofiaBulgaria

Background:Some data indicate that the dopaminergic and GABAergic systems interact in the vertebrate retina,but the type of interactions is not well understood.Methods:In this study we investigated the effect of dopamine d_(1) receptor blockade by 75μM SCH 23390 on the electroretinographic ON(b-wave)and OFF(d-wave)responses in intact frog eyecup preparations and in eyecups where the ionotropic GABA receptors were blocked by 50μM picrotoxin.Student’s t-test,One-way repeated measures ANOVA with Bonferroni post-hoc test and Two-way ANOVA were used for statistical evaluation of the data.Results:We found that SCH 23390 alone significantly enhanced the amplitude of the b-and d-waves without altering their latency.The effect developed rapidly and was fully expressed within 8-11 min after the blocker application.Picrotoxin alone also markedly enhanced the amplitude of the ERG ON and OFF responses and increased their latency significantly.The effect was fully expressed within 25-27 min after picrotoxin application and remained very stable in the next 20 min.The effects of SCH 23390 and picrotoxin are similar to that reported in our previous studies.When SCH 23390 was applied on the background of the fully developed picrotoxin effect,it diminished the amplitude of the b-and d-waves in comparison to the corresponding values obtained during application of picrotoxin alone.Conclusion:Our results demonstrate that the enhancing effect of d_(1) receptor blockade on the amplitude of the ERG b-and d-waves is not evident during the ionotropic GABA receptor blockade,indicating an interaction between these neurotransmitter systems in the frog retina.We propose that the inhibitory effect of endogenous dopamine mediated by d_(1) receptors on the ERG ON and OFF responses in the frog retina may be due to the dopamine-evoked GABA release.

关键词： dopamine d_(1)receptors GABA Electroretinogram b-wave d-wave