检索结果-南通市图书馆

Teleportation of a two-particle four-component squeezed vacuum state by linear optical elements

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

Chinese Optics Letters 2009年第5期7卷 440-442页

作者：陈慧娜刘金明 state key laboratory of precision spectroscopy Department of PhysicsEast China Normal University department of physics National University of Singapore

We present a linear optical scheme for achieving a unity fidelity teleportation of a two-particle four- component squeezed vacuum state using two entangled squeezed vacuum states as quantum channel. The devices used are beam splitters and ideal photon detectors capable of distinguishing between odd and even photon numbers. Moreover, we also obtain the success probability of the teleportation scheme.

关键词： Particle beams Vacuum

Efficient Laser-Diode End-Pumped Passively Q-Switched Mode-Locked Yb：LYSO Laser Based on SESAM

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2008年第2期25卷 548-551页

作者：徐世祥李文雪郝强翟惠曾和平 state key laboratory of precision spectroscopy and Department of Physics East China Normal University Shanghai 200062

We report an efficient Q-switched laser action based on a semiconductor saturable absorber mirrors （SESAMs） as passively Q-switched laser starter and a Yb：LYSO alloyed crystal as gain material pumped directly by 974nm InGaAs laser diodes. The output pulse duration is measured to be about 7μs, while the average power and the repetition rate of the pulse chain are about 0.92 W and 6.2 kHz, respectively, under 12.5 W absorbed pumping power. The Q-switched mode-locked pulse train is also observed in this setup. The laser performance shows that Yb：LYSO is a promising laser gain medium for laser-diode pumped compact solid-state lasers.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Quantum optical devices based on four-wave mixing in hot rubidium vapor

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

Science China(physics,Mechanics & Astronomy) 2015年第6期58卷 47-54页

作者： FANG YaMi QIN ZhongZhong WANG HaiLong CAO LeiMing XIN Jun FENG JingLiang ZHANG WeiPing JING JieTai state key laboratory of precision spectroscopy Quantum Institute for Light and AtomsDepartment of PhysicsEast China Normal University

In this paper,we briefly review the recent experimental progresses in quantum optics based on four-wave mixing(FWM) processes in hot rubidium vapor,particularly our two recent experiments in quantum *** have experimentally produced strong quantum correlations between three bright beams generated by two cascaded FWM *** intensity difference squeezing with the cascaded system is enhanced to(-7.0±0.1)d B from the(-5.5±0.1)d B/(4.5±0.1)d B with only one FWM ***,this system can be easily extended to multiple modes using multiple FWM ***,we have also successfully realized a cascade all-optical transistor(AOT),which is driven by a very weak light beam about 800 photons in *** required probe power for achieving a switching efficiency of 50% can be as low as 180 p W,and it can manipulate a light beam with power of 5.0×106 times more,which proves the cascade of the *** experiments may find wide applications in quantum information and optical communication.

关键词： four wave mixing quantum correlations all-optical transistor quantum information and optical communication

Phase diagram of muonium hydride:the significant effect of dimensionality

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2024年第2期76卷 182-187页

作者： Jieru Hu Massimo Boninsegni department of physics University of Alberta state key laboratory of precision spectroscopy East China Normal University

We carry out a theoretical investigation of the low-temperature phase diagram of muonium hydride in two dimensions,using numerical *** is shown that the phase diagram of this substance is qualitatively different in two and three ***,while in three dimensions it is essentially identical to that of parahydrogen,i.e.,only displaying a single(crystalline)*** two dimensions it is very similar to that of^(4)He,with an equilibrium liquid phase that turns superfluid at a temperature as high as~2.2 K,and crystallizes under applied *** is a well-described case of a continuous-space condensed matter system whose ground state equilibrium phase is qualitatively altered by dimensional reduction.

关键词： quantum fuids and solids quantum Monte Carlo phase diagrams

Laser guiding of cold molecules in a hollow optical fiber and continuous-wave cold molecular beam generation

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2012年第3期21卷 185-190页

作者：刘润琴尹亚玲印建平 state key laboratory of precision spectroscopy Department of PhysicsEast China Normal University department of physics Kashgar Teachers College department of physics National Laboratory of Solid State MicrostructuresNanjing University

A novel scheme for guiding arbitrary buffer-gas cooled neutral molecules in a hollow optical fiber （HOF） using a red-detuned HEll mode is proposed and analysed theoretically. We give the electromagnetic field distribution of the HEll mode in the HOF and calculate the optical potential of an 12 molecule, and study the molecule guiding mechanism using a classical Monte Carlo simulation. Using a 6 kW input laser, an S-shape HOF with a 2 cm curvature radius for both bends, and an input molecular beam with a transverse temperature of 0.5 K and longitudinal temperature of 5 K, we obtain a guiding efficiency of -0.126% for the scheme, and the transverse and longitudinal temperatures of the guided molecular beam are 1.9 mK and 0.5 K, respectively.

关键词： laser guiding cold molecular beam

Nonlinear polarization rotation-induced pulse shaping in a stretched-pulse ytterbium-doped fiber laser

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第10期23卷 155-161页

作者：白东碧李文雪杨康文沈旭玲陈修亮曾和平 state key laboratory of precision spectroscopy East China Normal University

We report on controllable pulse shaping in a Yb-doped stretched-pulse fiber laser followed by a high-power chirped pulse amplifier. We demonstrate that the pulses after an extra-cavity grating pair change their intensity profile from Lorentz to Gaussian and then to sech2 shapes by adjusting the intra-cavity polarization through a quarter-wave plate inside the fiber laser cavity. The laser pulses with different pulse shapes exhibit pulse-to-pulse amplitude fluctuation of -- 1.02%, while the sech2-shaped pulse train is provided with a more stable free-running repetition rate as a result of the stronger self-phase modulation in the fiber laser cavity than Lorentz- and Gaussian-shaped pulse trains.

关键词： fiber lasers nonlinear optics mode locking pulse generators

Deep-ultraviolet surface plasmon resonance of Al and Al_(core)/Al_2O_(3shell) nanosphere dimers for surface-enhanced spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第9期23卷 387-393页

作者：慈雪婷吴伯涛宋敏陈耿旭刘岩武愕曾和平 state key laboratory of precision spectroscopy East China Normal University

The localized surface plasmon resonance properties of Al and Alcore/Al2O3shell nanosphere dimers with Al and Al core nanosphere radii of 20 nm and Al2O3 shell of 2 nm in the deep-ultraviolet region have been studied using the finite difference time domain method. The extinction spectra and the electric field distribution profiles of the two dimers for various gap distances between two individual nanospheres are compared with those of the corresponding monomers to reveal the extent of plasmon coupling. It is found that with the interparticle distance decreasing, a strong plasmon coupling between two Al or Alcore/Al2O3shell nanospheres is observed accompanied by a significant red shift in the extinction spectra at the parallel polarization direction of the incident light related to the dimer axis, while for the case of the perpendicular polarization direction, a weak plasmon coupling arises characterized by a slight blue shift in the extinction spectra. The electric field distribution profiles show that benefiting from the dielectric Al2O3 shell, the gap distance of Alcore/Al2O3shell nanosphere dimers can be tailored to 〈 1 nm scale and results in a very high electric field enhancement. The estimated surface-enhanced Raman scattering enhancement factors suggests that the Alcore/Al2O3shell nanosphere dimers with the gap of 〈 1 nm gave rise to an enhancement as high as 8.1 × 10^7 for interparticle gap = 0.5 nm. Our studies reveal that the Alcore/Al2O3shell nanosphere dimers may be promising substrates for surface-enhanced spectroscopy in the deep-ultraviolet region.

关键词： localized surface plasmon resonance deep ultraviolet aluminum nanosphere dimers enhancedspectroscopy

Quantum correlation switches for dipole arrays

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第11期23卷 186-193页

作者：李艳杰刘金明张燕 state key laboratory of precision spectroscopy East China Normal University

We investigate the characteristics of three kinds of quantum correlations, measured by pairwise quantum discord （QD）, geometric measure of quantum discord （GMQD）, and measurement-induced disturbance （MID）, in the systems of three- and four-dipole arrays. The influence of the temperature on the three quantum correlations and entanglement of the systems is also analyzed numerically. It is found that novel quantum correlation switches called QD, GMQD, and MID respectively can be constructed with the qubits consisting of electric dipoles coupled by the dipole-dipole interaction and oriented along or against the external electric field. Moreover, with the increase of temperature, QD, GMQD, and MID are more robust than entanglement against the thermal environment. It is also found that for each dipole pair of the three- and four-dipole arrangements, the MID is always the largest and the GMQD the smallest.

关键词： dipole arrays quantum discord geometric measure of quantum discord measurement-induceddisturbance

Facilitation of controllable excitation in Rydberg atomic ensembles

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2023年第8期32卷 274-282页

作者：王涵钱静 state key laboratory of precision spectroscopy Department of PhysicsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China

Strongly-interacting Rydberg atomic ensembles have shown intense collective excitation effects due to the inclusion of single Rydberg excitation shared by multiple atoms in the *** this paper we investigate a counter-intuitive Rydberg excitation facilitation with a strongly-interacting atomic ensemble in the strong probe-field regime,which is enabled by the role of a control atom *** from the case of a single ensemble,we show that,the control atom's excitation adds to a second two-photon transition onto the doubly-excited Rydberg state,arising an excitation facilitation for the ensemble *** numerical studies depending on the method of quantum Monte Carlo wave function,exhibit the observation constraints of this excitation facilitation effect under practical experimental *** results obtained can provide a flexible control for the excitation of Rydberg atomic ensembles and participate further uses in developing mesoscopic Rydberg gates for multiqubit quantum computation.

关键词： excitation facilitation Rydberg atom Monte Carlo wave function many-body system