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EQEC'96. 1996 European Quantum Electronic Conference最新文献

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Resonance fluoresceuce Of an Atom Equally Perturbed by Light and Collisions. 受光和碰撞等扰动的原子的共振荧光。
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561811
W. Chalupezak, W. Gawlik, B. Lobodzinski, T. Pałasz, J. Zachorowski
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引用次数: 0
New Experiments with Optical Lattices 光学晶格的新实验
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561509
A. Hemmericl, A. Gorlitz, M. Weidemuller, T. Hansch
rly ~II~II~IIIII ~ . l twry of dectrical coi~drirtivity iii crystal latticcs hy I3loch aiid Zener [ I ] I(YI t,o the striking predirtion that a lioniogciicons static clcctric ficld iiiduces ail oscillatory rather thau u~ i i fo r~ r i notion of the electrons. l lcrr wc preseut Blocli oscillations o f atoiiis i i i I.he fundanieutal and iii the first excit.ccl cwxgy baiid of a periodic optical potential 121. ‘lliis poteiitial results from the light-shift of the grouud state of atoms illuminatr t l hy a laser stailding wave. The laser is detuncd far from any atomic resouancc so tliat spoiitancoiis emission can he neglected. Using one-dimensional Ranian laser cooling [3,4] we first prepare a gas of free atoms with a ~nomentum spread 61, = hk/4 in the direction of the standing wave, where hk i s tlic pliol.on ~nonrei~tum. The corresponding atomic coherence length h/6p extends over ~everal periods d = X/2 = 7 r / k of the optical lattice. I3y adiabatically switching on thc light potential this initial momentum distribution is turned into a statistical mixture of 131ocli stales i n the ground energy band with a quasi-rnomnrtu~n width 6y = 6 p / h much snrallcithan the width 2k of the Brillouin zone. We mimic a constant external force by inl.roducing a t.uiiable frequency difference 6 v ( t ) between the two counterpropagating laser waves rreal.ing the optical potential. For a linear variation io time of 6v( l ) a constant inerl.ial force 1.’ = m a = -mX$6v( t ) /2 is exerted 011 the atoms in the frame of the slanding wave. After a given evolution time, we abruptly switch off the light potential and inrasure thr momentum distribution of the Blocli sl.ate with a resolution of R k / l S . ‘I’lie nieaii atomic velocity displays oscillations with periods in the millisecond range and a~nplit~ndes between 0.7 and 0.3 UR for potential depths (io between 0.8 and 5.6 ER. where i>f? = h.k/7n is the recoil velocity and ER = (hk)’/2m the recoil energy. We measured positive and negative effective masses, differeut from the mass of the free cesium atom. Froiu the measured velocity curves we can reconstruct the shape of the fundamental energy band. Wr have also calculated numerically the band structure for our experimental values of [ io. The agreement with the experimental data is quite good. 4k have niadc investigations of atom acceleratiori in (.he case of deeper potentials up to r:, = 10EJ3. We could still observe Bloch states after more thau 40 oscillation periods. 111 t.lrc Iaboralory frame, this corresponds to a coherent mom en tun^ transfer of S O U . prodnring aii atomic beam with subrecoil momentum spread (h1;/4) in the beam direction.
rly ~II~II~IIIII ~。l twry dectrical coi ~ drirtivity三世水晶latticcs hy I3loch携带齐纳(我)我(YI t o的惊人predirtion lioniogciicons静态clcctric ficld iiiduces苦恼振荡,而肖u ~我我佛~ r电子的概念。所有的函数都可以表示出函数的bloi振荡,即基本激发态和第一激发态。一个周期光势的CCL cwxy。liliis的潜在结果来自于原子基态的光移,从而产生激光驻波。激光在远离任何原子源的地方衰减,因此可以忽略任何杂波辐射。利用一维拉尼激光冷却[3,4],我们首先在驻波方向制备了一种自由原子气体,其动量分布为61,= hk/4,其中hk为最小常数。~ nonrei ~中空的。相应的原子相干长度h/6p扩展到光学晶格的~几个周期d = X/2 = 7 r / k。当光势绝热开启时,初始动量分布变成了地面能带上1310i - 1的统计混合,其准稳态宽度为6y = 6p / h,远小于布里渊带的宽度2k。我们用1来模拟恒定的外力。在两个反向传播的激光波之间产生6 v (t)的可调频率差。Ing光势。对于线性变化时间为6v(l)的恒定内蕴。力1。' = m a = -mX$6v(t) /2施加在倾斜波框架内的原子上。在给定的演化时间后,我们突然关闭光势,并保证Blocli slate的动量分布,其分辨率为R k / l S。“I’lie nieaii”原子速度显示出周期在毫秒范围内的振荡,潜在深度在0.8至5.6 ER之间的~nplit~节点在0.7至0.3 UR之间。我> f在哪里?= hk /7n为后坐力速度,ER = (hk)′/2m为后坐力能量。我们测量了正负有效质量,不同于自由铯原子的质量。根据测量的速度曲线,我们可以重建基本能带的形状。我们还对实验值[o]的带结构进行了数值计算。与实验数据吻合较好。我们对宇宙中的原子加速进行了新的研究。当电位达到r:, = 10EJ3时。在40多个振荡周期后,我们仍然可以观察到布洛赫态。在实验框架中,这对应于S / U的一个连贯的母链转移。在光束方向上产生具有亚后坐力动量扩散(h1;/4)的原子束。
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引用次数: 0
Quantum Coding and Quantum Communications 量子编码与量子通信
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561539
M. Reck, Klaus Mattle, H. Weinfurter, A. Zeilinger, P. G. Kwait
Circular Rydberg atom strongly coupled to superconducting millimeterwave cavities make it poasible to realize experiments on fundamental aspects of quantum mechanics. Resonant and dispersive atom-field interactions provide ways to realize quantum s t a b swapping and conditional quantum dynamics. They can be used to produce non local correlations and complex, tailored, entangled quantum states in many particle systems. Fundamental test of quantum mechaniw are now within the reach of cavity quantum electrodynamiw experimenta. Complex quantum states are ala0 at the heart of the recently proposed techniques for quantum information processing or quantum computing, a field boiling with excitement. Although cavity QED techniques allow the realization of some basic components, such a quantum logic gata, they also provide experimental insighta into the dewherenee processes, which doom any attempt to realize a large scale quantum information processing ma&. In the light of recant experiments performed in our laboratory, we &CUBS realistic perspectives and impossibilities in this field. Abstract
圆里德伯原子与超导毫米波腔强耦合使量子力学基本方面的实验成为可能。共振和色散原子场相互作用为实现量子量子交换和条件量子动力学提供了途径。它们可以用于在许多粒子系统中产生非局部关联和复杂的、定制的、纠缠的量子态。量子力学的基本测试现在是在腔量子电动力学实验的范围内。复杂量子态是最近提出的量子信息处理或量子计算技术的核心,这是一个令人兴奋的领域。虽然腔QED技术允许实现一些基本组件,如量子逻辑数据,但它们也提供了对去where过程的实验见解,这使得任何实现大规模量子信息处理的尝试都失败了。根据最近在我们实验室进行的实验,我们和小熊现实的观点和不可能在这个领域。摘要
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引用次数: 0
Cryogenic Optical Resonators For Ultra-Stable Lasers 超稳定激光器的低温光学谐振器
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561579
S. Seel, R. Storz, G. Ruoso, S. Schiller, J. Mlynek
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引用次数: 0
Generation of Quadrature Squeezed Light By Cross-Phase Modulation in Semiconductors 半导体中交叉相位调制产生正交压缩光
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561521
G. von Plessen, A. M. Fox, M. Dabbicco, G. Schucan, J. F. Ryan
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引用次数: 0
Non Linear Spectroscopy of Single Molecules in Low Temperature Solids 低温固体中单分子的非线性光谱研究
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561791
B. Lounis, P. Tamarat, M. Orrit
The fluorescence exciliition spectra ol small and dilute samples of solid solutions kept at helium temperatures display sharp homogeneous lines of individual solute molecules. Single molecule lines arc sensitive to external perturbations such as electric fields or pressurc. The fluctuations of the fluorescence signal show characteristic times ranging from nanoseconds to minutes. They give information about the dynamics within the molecule (intersystem crossing, Rabi nutation) as well i ~ s in the surrounding matrix (spectral diffusion of the resonance frequency). Non-linear optical experiments have been performed on single molecules. First, single pentacene molecules in p-terphenyl crystals demonstrate paramagnetic resonance in their triplet states. This non-linear efrect appears when the molecule is subjected to resonant microwaves in addition to optical excitation. Microwave pulses were used to produce transient effects, and were synchronised with the molecule itself. We performed non-linear optical experiments of the pump-probe type on the narrow excitation lines of single terrylene molecules in a pterphenyl crystal. At low saturations, the pump beam was found to shift the optical transition of the molecule as expected : proportionally to the intensity and inverse pump detuning. The variations of the fluorescence signal (proportional to the excited state population of the molecule) were also studied with pump and probe closer to resonance. Because of triplet saturation, the signal variations are rather weak and high pump powers had to be used. Upon tuning the probe beam through the resonance, W-shaped structures were obtaiped, recalling Autler-Townes splittings. The shape of the structures is correctly reproduced by numerical simulations of the optical Bloch equations in two intense laser fields and indicates photon exchange between pump and probe beams. These results show the possibility of non-linear and quantum optical experiments on single molecules in condensed matter, even though thc shifts observed are much weaker than disorder-induced inhomogeneous broadening. I 09:oo QThE32 Q U A N T U M EFFEC'TS A N D SPECTRAL DYNAMICS OF SINGLE TEIlRYLENE MOLECULES I N A /+TERPHENYL CRYSTAL.
在氦温度下,固溶体样品的荧光激发光谱显示出单个溶质分子的清晰均匀线。单分子线对外部扰动(如电场或压力)很敏感。荧光信号的波动表现出从纳秒到分钟不等的特征时间。它们给出了分子内部的动力学信息(系统间交叉,拉比章动)以及周围矩阵中的i ~ s(共振频率的谱扩散)。对单分子进行了非线性光学实验。首先,对三苯基晶体中的单并五苯分子在其三重态下表现出顺磁共振。除了光激发外,当分子受到共振微波时,这种非线性效应就会出现。微波脉冲被用来产生瞬态效应,并与分子本身同步。在多苯基晶体中,对单涤纶分子的窄激发谱线进行了泵浦-探针型非线性光学实验。在低饱和度下,发现泵浦光束像预期的那样改变了分子的光学跃迁:与强度成比例,并产生了反泵浦失谐。荧光信号的变化(与分子激发态居群成正比)也研究了泵和探针更接近共振。由于三重态饱和,信号变化非常微弱,必须使用高泵浦功率。在通过共振调谐探针束后,获得了w形结构,使人想起奥特勒-汤斯分裂。通过对两个强激光场中光学布洛赫方程的数值模拟,正确地再现了结构的形状,并表明了泵浦和探针光束之间的光子交换。这些结果显示了在凝聚态单分子上进行非线性和量子光学实验的可能性,尽管观察到的c位移比无序引起的非均匀展宽弱得多。[09] [10] [32] [Q] [A] [N] [M]在A /+三苯晶体中对单乙烯分子的N - D光谱动力学的影响。
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引用次数: 0
Multi-Plasmon Processes in Spectroscopy of Electron-Hole Plasma in A2B6 Semiconductors A2B6半导体中电子-空穴等离子体光谱中的多等离子体过程
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561548
V. S. Vavilov, A. Klyukanov, K. Sushkevich, M. Chukichev, A. Awawdeh, R. R. Resvanov
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引用次数: 0
Superradiant Excitons in GaAs Single Quantum Wells GaAs单量子阱中的超辐射激子
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561530
P. Vledder, F. Schuurmans, J. I. Dijkhuis
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引用次数: 0
Emission of Terahertz Radiation From Optically Excited Coherent Plasmons in a Two-Dimensional Electron Gas 二维电子气体中光激发相干等离子体的太赫兹辐射发射
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561594
M. Vosseburger, H. Roskos, F. Wolter, C. Waschke, K. Kurz, K. Hirakawa, I. Wilke, K. Yamanaka
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引用次数: 0
A New Mechanism of Passive Mode Locking in A Soliton Fiber Laser 一种新的孤子光纤激光器无源锁模机制
Pub Date : 1996-01-01 DOI: 10.1109/EQEC.1996.561942
V. Bryksin, M. Petrov
The propagation of pulses and beam profiles under the action of two-photon absorption (TPA) has great interest nowadays, because the potential action of TPA as a limitation factor in switching devices using high nonlinearitiesll]. Variational approaches have been applied successfully to the problem of temporal dispersion andlor spatial diffraction in nonlinear propagation which is described by a nonlinear Schrodinger equation[2]. These approaches am usually limited to conservative optical systems, due to mathematical difficulties that the dissipation term brings about. The purpose of this study is lo apply a variational technique to investigate dissipative nonlinear propagation. By means of the generalization of the Kantorovich method, suitable for non-conservative systems, we are able to deal with the problem of soliton propagation under the influence of TPA. Based on the characteristics of the exact solution in the absence of TPA. and supposing an adiabatic process we propose a family of soliton solutions as trial functions. This procedure results in analytical expressions that illustrate the changes during propagation of the soliton’s parameters such as amplitude, width and phase. The rate at which energy is dissipated is also obtained and, as expected, from a TPA process. is proportional to 1’. Comparison of the behavior predicted by our approximate solutions with numerical results available in the literature show very good agreement[3]. The dissipative variational approach can be extended to deal with more dimensions in the NLSE and to different kinds of dissipative nonlinearities as €?+-doped fiber amplifiers. In conclusion, a variational approach for non-conservative propagation has been used to provide a suggestive description for soliton propagation under TPA effect. As the problem of non-conservative propagation is shared by many areas of physics other than light pulse propagation, we emphasize that the present approach may be useful for a quite wide range of areas and different kinds of dissipative terms.
双光子吸收(TPA)作用下脉冲和光束轮廓的传播目前引起了人们极大的兴趣,因为在使用高非线性的开关器件中,TPA的潜在作用是一个限制因素[11]。变分方法已经成功地应用于非线性传播中的时间色散和空间衍射问题,该问题由非线性薛定谔方程描述[2]。由于耗散项带来的数学困难,这些方法通常仅限于保守光学系统。本研究的目的是应用变分技术来研究耗散非线性传播。通过对适用于非保守系统的Kantorovich方法的推广,我们能够处理在TPA影响下的孤子传播问题。基于该特性的精确解在没有TPA的情况下。假设一个绝热过程,我们提出一组孤子解作为试函数。这个过程的结果是解析表达式,它说明了在传播过程中孤子参数(如振幅、宽度和相位)的变化。能量耗散的速率也可以从TPA过程中得到。与1 '成正比。将我们的近似解预测的行为与文献中可用的数值结果进行比较,结果显示出非常好的一致性[3]。耗散变分方法可以扩展到处理NLSE中的更多维度和不同类型的耗散非线性。+掺杂光纤放大器。最后,利用非保守传播的变分方法为TPA效应下的孤子传播提供了一个暗示性的描述。由于非保守传播问题是除光脉冲传播以外的许多物理领域共有的问题,我们强调,本方法可能适用于相当大范围的区域和不同类型的耗散项。
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引用次数: 0
期刊
EQEC'96. 1996 European Quantum Electronic Conference
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