共查询到20条相似文献,搜索用时 15 毫秒
1.
Shi-Biao Zheng 《Physics letters. A》2008,372(5):591-595
A scheme is proposed for generating maximally entangled states for three atoms trapped in a two-mode cavity. The scheme is based on resonant atom-cavity interaction and linear optics elements. The fidelity of the entangled state is not affected by both the decoherence and detection inefficiencies. The scheme works beyond the strong-coupling regime, which is important for high-fidelity entanglement engineering under realistic conditions. 相似文献
2.
A scheme for preparation of the tripartite W state via cavity quantum electrodynamics is presented in this paper. And the scheme can be generalized to prepare the n-atom W states. The second part of this paper shows how to prepare n-cavity W states. All cavities involved are initially in the vacuum states, thus the requirement on the quality factor of the cavities is greatly loosened. 相似文献
3.
Generation of Greenberger-Horne-Zeilinger states for multiple atoms trapped in separated cavities 总被引:1,自引:0,他引:1
S. B. Zheng 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,54(3):719-722
We propose a scheme for generating maximally entangled states for multiple atoms trapped in distant cavities connected by
fibers. During the operation neither the atomic system nor the fibers are excited, which is important in view of decoherence.
Under certain conditions, the probability that the cavities are excited is negligible. The scheme does not include projective
measurement and the GHZ state is generated deterministically. Taking advantage of adiabatic passage, the entanglement fidelity
is insensitive to fluctuation of experimental parameters. 相似文献
4.
Y.W. Duan L. Shi M. Feng X. Zhu 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,7(2):191-197
The hyperspherical-coordinate approach is employed to a one-dimensional model of three ions in a Paul trap. It is shown that
the eigen wave functions have well-defined nodal structure indicating a near separability in the hyperspherical coordinates, then two approximate good quantum numbers
are introduced to classify the eigenstates. Three important classical periodic motions, including the breathing motion and
the (distorted-)symmetric or anti-symmetric stretching motion, are found to dominate the wave function distribution.
Received: 10 February 1999 / Received in final form: 25 March 1999 相似文献
5.
研究了处于W类态的三纠缠原子与相干态光场相互作用过程中光场的量子特性;运用数值方法,讨论了三纠缠原子初始状态和相干态光场的强弱对系统光场压缩和二阶相干特性的影响。 相似文献
6.
J. E. Palmer 《Molecular physics》2019,117(21):3108-3119
Matter-wave interferometry has been performed with helium atoms in high Rydberg states. In the experiments the atoms were prepared in coherent superpositions of Rydberg states with different electric dipole moments. Upon the application of an inhomogeneous electric field, the different forces on these internal state components resulted in the generation of coherent superpositions of momentum states. Using a sequence of microwave and electric field gradient pulses the internal Rydberg states were entangled with the momentum states associated with the external motion of these matter waves. Under these conditions matter-wave interference was observed by monitoring the populations of the Rydberg states as the magnitudes and durations of the pulsed electric field gradients were adjusted. The results of the experiments have been compared to, and are in excellent quantitative agreement with, matter-wave interference patterns calculated for the corresponding pulse sequences. For the Rydberg states used, the spatial extent of the Rydberg electron wavefunction was ~320?nm. Matter-wave interferometry with such giant atoms is of interest in the exploration of the boundary between quantum and classical mechanics. The results presented also open new possibilities for measurements of the acceleration of Rydberg positronium or antihydrogen atoms in the Earth's gravitational field. 相似文献
7.
Generation of atomic Greenberger-Horne-Zeilinger states and cluster states through cavity-assisted interaction 下载免费PDF全文
This paper proposes a scalable scheme to generate n-atom GHZ states and cluster states by using the basic building block, i.e., a weak coherent optical pulse [α) being reflected successively from a single-atom cavity. In the schemes, coherent state of light is used instead of single photon source, homodyne measurement on coherent light is done kastead of single photon detection, and no need for individually addressing keeps the schemes easy to implement from the experimental point of view. The successful probabilities of our protocols approach unity in the ideal case. 相似文献
8.
We propose a scheme for generating maximally GHZ state for four atoms trapped in a two-mode optical cavity via combination of cavity QED and linear optics system. The GHZ state can be not only generated deterministically with a single resonant interaction in cavity QED, but also can be prepared probabilistically based on cavity QED and linear optics elements. The fidelity of the entangled states is not affected by the atomic spontaneous, cavity decay, and imperfection of the photon-detectors. Finally, we briefly analyze and discuss the experimental feasibility of the proposed scheme. 相似文献
9.
10.
类锂离子里德堡态中的自旋-其它轨道相互作用 总被引:6,自引:4,他引:2
以多电子原子精细结构哈密顿的球张量形式和三价原子的非相对论性能级结构理论为基础,借助不可约张量理论,建立了计算类锂离子里德堡态中的自旋-其它轨道相互作用能的一种解析理论形式.完成了所有的角向积分和自旋求和计算,自旋-其它轨道相互作用能最终用径向积分来表示.应用所建立的理论对类锂离子(1s2np)2Pj态的自旋-其它轨道相互作用能进行了具体分析. 相似文献
11.
T.S. Jensen V.E. Markushin 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,19(2):165-181
The differential and total cross-sections for the scattering of muonic, pionic, kaonic and antiprotonic hydrogen in excited
states from atomic hydrogen have been calculated for the purpose of atomic cascade calculations. The scattering problem is
treated in a fully quantum mechanical framework which takes the energy shifts and, in the case of the hadronic atoms, the
widths of the ns states into account. The validity of semiclassical approximations is critically examined.
Received 4 December 2001 and Received in final form 4 February 2002 相似文献
12.
本文采用求解Schr dinger方程和数值计算的方法,研究了处于GHZ类态的三个全同二能级纠缠原子与相干态光场相互作用的光场压缩特性,结果表明:光场压缩量随时间的演化关系与三原子体系纠缠度和相干态光场的光场强度相关.在光场较弱、纠缠度较小时,可出现光场压缩现象;光场的增强或纠缠度的增加,都会使光场压缩现象消失. 相似文献
13.
14.
T.S. Jensen V.E. Markushin 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,21(3):261-270
The deexcitation of exotic hydrogen atoms in highly excited states in collisions with hydrogen molecules has been studied
using the classical-trajectory Monte Carlo method. The Coulomb transitions with large change of principal quantum number n have been found to be the dominant collisional deexcitation mechanism at high n. The molecular structure of the hydrogen target is shown to be essential for the dominance of transitions with large Δn. The external Auger effect has been studied in the eikonal approximation. The resulting partial wave cross-sections are consistent
with unitarity and provide a more reliable input for cascade calculations than the previously used Born approximation.
Received 28 May 2002 Published online 15 October 2002
RID="a"
ID="a"e-mail: thomas@physik.unizh.ch 相似文献
15.
Efficient scheme for entangled states and quantum information transfer with trapped atoms in a resonator 下载免费PDF全文
A protocol is proposed to generate atomic entangled states and implement quantum information transfer in a cavity quantum electrodynamics system. It utilizes Raman transitions or stimulated Raman adiabatic passages between two systems to entangle the ground states of two three-state Λ-type atoms trapped in a single mode cavity. It does not need the measurements on cavity field nor atomic detection and can be implemented in a deterministic fashion. Since the present protocol is insensitive to both cavity decay and atomic spontaneous emission, it may have some interesting applications in quantum information processing. 相似文献
16.
17.
18.
W. B. Cardoso 《物理学报》2008,57(1):60-63
Inspired by a recent paper [2002 {\it J. Opt. B {\bf 4 316] we
present an alternative scheme to teleport an entanglement of zero-
and one-photon states of a running-wave field. The scheme employs
only linear optical elements plus single-photon sources and
detectors. 相似文献
19.
本文提出一个方案以通过探测光子的衰减来制备囚禁在一个腔中的若干个原子的W态。在我们的方案中,腔的衰减率远大于原子与腔的耦合强度。这样,对腔品质因子的要求被大大降低。这在实验上是很重要的。本方案的另一个优点是通过拉曼跃迁原子总是处于两个基态,因而原子的自发辐射也被抑制。 相似文献
20.
Inspired by a recent paper [2002 J. Opt. B 4 316] we present an alternative scheme to teleport an entanglement of zero- and one-photon states of a running-wave field. The scheme employs only linear optical elements plus single-photon sources and detectors. 相似文献