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Deterministic remote preparation of arbitrary two- and three-qubit states 任意二和三量子位态的确定性远程制备
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/40005
Y. Zhan
{"title":"Deterministic remote preparation of arbitrary two- and three-qubit states","authors":"Y. Zhan","doi":"10.1209/0295-5075/98/40005","DOIUrl":"https://doi.org/10.1209/0295-5075/98/40005","url":null,"abstract":"Recently Liu et al. (EPL, 87 (2009) 30006) have proposed two new schemes for probabilistically preparing arbitrary two- and three-qubit states with complex coefficients based on two- and three-qubit projective measurement, respectively. In this letter, we present a possible improvement of the successful probability for their schemes. For this purpose, we put forward two novel schemes for remote preparation of arbitrary two- and three-qubit states with complex coefficients via two and three GHZ states as the quantum channel, respectively. To complete the schemes, two novel unitary operations have been introduced. Compared with the previous schemes, the advantage of our schemes is that the total successful probability can reach 100%.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129987294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 41
Shaken not stirred —On internal flow patterns in oscillating sessile drops 摇而不搅——振荡无柄液滴的内部流动模式
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/34003
J. Oh, D. Legendre, F. Mugele
{"title":"Shaken not stirred —On internal flow patterns in oscillating sessile drops","authors":"J. Oh, D. Legendre, F. Mugele","doi":"10.1209/0295-5075/98/34003","DOIUrl":"https://doi.org/10.1209/0295-5075/98/34003","url":null,"abstract":"We use numerical (volume of fluid) simulations to study the flow in an oscillating sessile drop immersed in an ambient immiscible fluid. The drop is excited by a sinusoidal variation of the contact angle at variable frequency. We identify the eigenfrequencies and eigenmodes of the drops and analyze the internal flow fields by following the trajectories of tracer particles. The flow fields display an oscillatory component as well as a time-averaged mean component. The latter is oriented upward along the surface of the drop from the contact line towards the apex and downward along the symmetry axis. It vanishes at high and low frequencies and displays a broad maximum around f=200–300 Hz. We show that the frequency dependence of the mean flow can be described in terms of Stokes drift driven by capillary waves that originate from the contact line, in agreement with recent experiments (Mugele F. et al., Lab Chip, 11 (2011) 2011).","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126308490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Creep motion of a domain wall in the two-dimensional random-field Ising model with a driving field 带驱动场的二维随机场Ising模型中畴壁的蠕变运动
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/36002
R. Dong, B. Zheng, N. Zhou
{"title":"Creep motion of a domain wall in the two-dimensional random-field Ising model with a driving field","authors":"R. Dong, B. Zheng, N. Zhou","doi":"10.1209/0295-5075/98/36002","DOIUrl":"https://doi.org/10.1209/0295-5075/98/36002","url":null,"abstract":"With Monte Carlo simulations, we study the creep motion of a domain wall in the two-dimensional random-field Ising model with a driving field. We observe the nonlinear field-velocity relation, and determine the creep exponent μ. To further investigate the universality class of the creep motion, we also measure the roughness exponent ζ and energy barrier exponent ψ from the zero-field relaxation process. We find that all the exponents depend on the strength of disorder.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121538702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Spin and orbital blockade in quantum transport through double quantum dots 双量子点量子输运中的自旋和轨道阻塞
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/47009
Ai-xian Li, S. Duan, Wei Zhang
{"title":"Spin and orbital blockade in quantum transport through double quantum dots","authors":"Ai-xian Li, S. Duan, Wei Zhang","doi":"10.1209/0295-5075/98/47009","DOIUrl":"https://doi.org/10.1209/0295-5075/98/47009","url":null,"abstract":"Spin and orbital degrees of freedom play different roles in quantum transport through nanostructures. In this paper, we study spin and orbital blockade in quantum transport through an asymmetric double quantum dot with inhomogeneous Zeeman splittings in the presence of crossed dc and ac magnetic fields. The interplay among electron spin resonance, Pauli exclusion, resonant tunneling, and quantum interference leads to quite different current responses for forward/backward bias in the slow/fast spin-flip regime. In particular, as change of the dc magnetic field, we observe both spin blockade (due to multiple particle spin correlation) and orbital blockade (due to quantum destructive interference) in the same system. Under suitable conditions, our system can act as bipolar spin filter, sensitive spin switch, and spin inverter.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"16 4-5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131529260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Transition in superelasticity for Ni55−xCoxFe18Ga27 alloys due to strain glass transition 应变玻璃化转变导致Ni55−xCoxFe18Ga27合金的超弹性转变
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/46004
D. P. Wang, X. Chen, Z. Nie, N. Li, Z. L. Wang, Y. Ren, Y. Wang
{"title":"Transition in superelasticity for Ni55−xCoxFe18Ga27 alloys due to strain glass transition","authors":"D. P. Wang, X. Chen, Z. Nie, N. Li, Z. L. Wang, Y. Ren, Y. Wang","doi":"10.1209/0295-5075/98/46004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/46004","url":null,"abstract":"Here we report a transition in superelastic hysteresis loop from sharp with plateau to smooth without plateau for a Ni55−xCoxFe18Ga27 (x=0–12) alloy system with increasing Co substituting for Ni up to 10 at.%. With the Co content reaching 10 at.%, the alloy exhibits the obvious characteristic of the strain glass transition, i.e., the frequency-dependent shift in temperature of the internal friction peak and frequency-dependent dip temperature, Tg, of the storage modulus following the Vogel-Fulcher relationship. The high-energy X-ray diffraction provides the direct evidence that the smooth hysteresis loops stem from a finite avalanche martensite transformation mode, inducing a long-range inhomogeneous stress field in the remained parent phase during deformation.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131249769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Reconstruction of deformed defects in field theory from deformed zero modes and applications 变形零模场理论中变形缺陷的重构及其应用
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/31004
A. R. Chumbes, A. E. Obispo Vasquez, M. Hott
{"title":"Reconstruction of deformed defects in field theory from deformed zero modes and applications","authors":"A. R. Chumbes, A. E. Obispo Vasquez, M. Hott","doi":"10.1209/0295-5075/98/31004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/31004","url":null,"abstract":"We reconstruct some nonlinear models in field theory involving a self-interacting scalar field in 1+1 space-time dimensions. Such a reconstruction is based on previous methods which employ the zero-mode solution of the excitation spectra of defects as the starting point. Here, we split the zero-mode solutions which turn out to be associated to split defects (split domain walls). The models which engender those kind of defects may be used to describe critical phenomena as domain wall splitting and the formation of a wetting phase in some ferroelectric and paramagnetic materials. We explore the applicability of the models also in the description of brane splitting in AdS brane scenarios.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114272499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The complex quantum harmonic oscillator model 复量子谐振子模型
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/30008
A. Arbab
{"title":"The complex quantum harmonic oscillator model","authors":"A. Arbab","doi":"10.1209/0295-5075/98/30008","DOIUrl":"https://doi.org/10.1209/0295-5075/98/30008","url":null,"abstract":"We have formulated a model of a complex (two-dimensional) quantum harmonic oscillator. All dynamical physical variables are expressed in terms of the creation and annihilation operators, viz., . The Hamiltonian of the system is , where ω is the oscillator frequency and is the orbital angular momentum. The oscillator is found to be described by a conserved orbital angular momentum (Lz) besides energy. While the ground-state wave function is real, all excited states are complex and degenerate. The oscillator in these states carry a quantum of charge of . These degenerate wave functions are eigenstates of the orbital angular momentum with eigenvalues nℏ and −nℏ, where h=2πℏ is the Planck's constant and n=1, 2, … . The two wave functions are degenerate with energy En=(n+1)ℏω. The comparison with Landau level reveals that in the presence of the magnetic field, B, where ω is equal to the cyclotron frequency, the current moment is quantized and is proportional to the square root of the magnetic field, i.e., .","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Design and fabrication of a spherical configuration ion source 球形离子源的设计与制造
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/45002
M. M. Abdel Rahman, F. Abdelsalam
{"title":"Design and fabrication of a spherical configuration ion source","authors":"M. M. Abdel Rahman, F. Abdelsalam","doi":"10.1209/0295-5075/98/45002","DOIUrl":"https://doi.org/10.1209/0295-5075/98/45002","url":null,"abstract":"We report a very simple ion source based on a glow discharge, where the cathode fall is used to accelerate ions; the applied voltage has therefore the purpose of both plasma generation and ion extraction, which makes construction and operation very simple. Discharge and ion beam characteristics of the spherical configuration ion source are studied at different experimental conditions. The ion beam current and gas flow pass through an orifice of small diameter which causes a mechanical confinement to focus the ion beam on the Faraday cup downstream of a distance of 3 cm. Experiments have been done with nitrogen as discharge gas. A disk of Bakelite insulator with different diameters (5, 10, 15, 20, 30 and 38 mm) has been put between the anode and the cathode. This disk covered the cathode area and reduced the discharge area on the cathode surface for discharge confinement; therefore, a higher output ion beam current could be obtained. The best working conditions were found to be at discharge pressure in the range of 10−4 mbar, gap distance between the cathode and the anode equal to 3 mm (insulator thickness) and orifice of the insulator diameter (Bakelite insulator) equal to 5 mm. Ion beam current of 230 μA was obtained at the optimum insulator orifice diameter of the Bakelite material (5 mm) for a nitrogen gas pressure of 5 ×10−4 mbar and a discharge current of 1 mA.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115965222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Double transition to synchronization: A generic emergent transitional behavior in large systems of coupled oscillators 双跃迁到同步:大型耦合振荡器系统中一种普遍的紧急跃迁行为
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/40007
J. Zamora-Munt, E. Ott
{"title":"Double transition to synchronization: A generic emergent transitional behavior in large systems of coupled oscillators","authors":"J. Zamora-Munt, E. Ott","doi":"10.1209/0295-5075/98/40007","DOIUrl":"https://doi.org/10.1209/0295-5075/98/40007","url":null,"abstract":"We study a system of M≫ 1 nonidentical laser oscillators coupled with time delay through a central laser oscillator in a star-coupling topology. In the large-M limit we show that this system undergoes novel transitional behavior which represents a new generic type of emergent behavior in large systems of coupled laser oscillators. Specifically, we observe a sequence of two dynamical transitions (“a double transition”). A first transition occurs when the effective threshold of the central oscillators is reached leading to an increase of the order parameter to a level far above the noise level. As the control parameter is raised further a second transition occurs leading to a further increase of the order parameter to a level of order M1/2 above the level achieved past the first transition. A scaling analysis and numerical experiments reveal the underlying mechanism of this scenario. We suggest that double transitions, discovered here in the context of a specific system, are expected to occur in diverse situations involving large coupled-oscillator networks.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126522371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Does copy-resistance enhance cooperation in spatial prisoner's dilemma? 空间囚徒困境下复制抵抗是否促进合作?
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/40008
K. Shigaki, S. Kokubo, J. Tanimoto, A. Hagishima, N. Ikegaya
{"title":"Does copy-resistance enhance cooperation in spatial prisoner's dilemma?","authors":"K. Shigaki, S. Kokubo, J. Tanimoto, A. Hagishima, N. Ikegaya","doi":"10.1209/0295-5075/98/40008","DOIUrl":"https://doi.org/10.1209/0295-5075/98/40008","url":null,"abstract":"We propose a novel idea for the so-called pairwise-Fermi process by considering copy-resistance when an agent copies a neighbor's strategy, which implies that the focal agent with relatively affluent payoff vis-à-vis social average might be negative to copy her neighbor's strategy even if her payoff is less than the neighbor's payoff. Simulation results reveal that this idea with a revised strategy adaptation process significantly enhances cooperation for prisoner's dilemma games played on time-constant networks.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127153678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
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