共查询到20条相似文献,搜索用时 15 毫秒
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We present a theoretical study of the propagation properties of polarized photons passing through the cavity with an anisotropic metamaterial. We find that the resonant peaks of transmission appear for photons polarized in a certain direction corresponding to a negative element of the permittivity tensor. This indicates the potential for applying such cavity structures as filters for photons with certain polarizations. The resonant peak of transmission for photons having a given frequency can be achieved by adjusting the thicknesses of the air and metamaterial. If the frequency of the incident photons and the thickness of the metamaterial are fixed, the cavity structure can be used as a photon switch controlled by the thickness of the air. The effect of the absorption is considered, and the result shows that the transmission peak always appears, even for metamaterials with large absorption. Finally, the polarization manipulation of such structures is explored. 相似文献
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This paper proposes a scheme for generation of superpositions of
coherent states of the effective bosonic mode in a collection of
atoms. In the scheme an atomic sample interacts with a slightly
detuned cavity mode and a resonant strong classical field. Under
certain conditions the atomic system evolves from a coherent state
to a superposition of coherent states. 相似文献
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We investigate the effect of the dipole–dipole interaction(DDI) on the photon statistics with two atoms trapped in an optical cavity driven by a laser field and subjected to cooperative emission. By means of the quantum trajectory analysis and the second-order correlation functions, we show that the photon statistics of the cavity transmission can be flexibly modulated by the DDI while the incoming coherent laser selectively excites the atom–cavity system's nonlinear Jaynes–Cummings ladder of excited states. Finally, we find that the effect of the cooperatively atomic emission can also be revealed by the numerical simulations and can be explained with a simplified picture. The DDI induced nonlinearity gives rise to highly nonclassical photon emission from the cavity that is significant for quantum information processing and quantum communication. 相似文献
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YI Xuexi WANG Haijun BA Xinwu WANG Jianwei 《Chinese Journal of Lasers》1999,8(4):334-340
Introduction Atomictrapping,cooling,momentumtransferandpreparationofFockstateshaveattractedalotofattentioninrecentyears[1,2].TheexperimentsonatomiccoolingandatomicBoseEinsteincondensationhavewitnessedconsiderableprogressinareasofatomquantizedfield… 相似文献
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Efficient scheme for teleportation of an unknown N-atom state via a two-atom entangled state without the Bell-state measurement in cavity QED 总被引:2,自引:0,他引:2 下载免费PDF全文
We propose a scheme for teleportation of an unknown N-atom state using a two-atom entangled state within a cavity QED and show the feasibility in experiment. Our scheme does not involve the Bell-state measurement and is insensitive to the cavity decay, which is important from the experimental point of view. Another feature of the scheme is that teleporting a N-atom state just requires a small amount of entanglement (i,e. a two-atom entangled state) and less classical bits (two bits). 相似文献
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Shouhua Chen Shounan Chen Zhonghua Rong R. M. Evans H. A. Schuessler 《Chinese Journal of Lasers》1992,1(3):235-241
When a high-intensity laser beam passes through a resonant atomic beam,non-linear stimulated emission effect will be produced.This effect can be enhanced up to two or-ders of magnitude by using an injection Fabry-Perot cavity.Experiments show that thismethod has high measuring contrast and high spectral resolution when it is used to measure thehyperfine absorption lines of atomic beams. 相似文献
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Single photon transport properties in coupled cavity arrays nonlocally coupled to a two-level atom in the presence of dissipation 下载免费PDF全文
We discuss the effects of dissipation on the behavior of single photon transport in a system of coupled cavity arrays,with the two nearest cavities nonlocally coupled to a two-level atom.The single photon transmission amplitude is solved exactly by employing the quasi-boson picture.We investigate two different situations of local and nonlocal couplings,respectively.Comparing the dissipative case with the nondissipative one reveals that the dissipation of the system increases the middle dip and lowers the peak of the single photon transmission amplitudes,broadening the line width of the transport spectrum.It should be noted that the influence of the cavity dissipation to the single photon transport spectrum is asymmetric.By comparing the nonlocal coupling with the local one,one can find that the enhancement of the middle dip of single photon transmission amplitudes is mostly caused by the atom dissipation and that the reduced peak is mainly caused by the cavity dissipation,no matter whether it is a nonlocal or local coupling case.Whereas in the nonlocal coupling case,when the coupling strength gets stronger,the cavity dissipation has a greater effect on the single photon transport spectrum and the atom dissipation affection becomes weak,so it can be ignored. 相似文献
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Yu-chi Zhang Gang Li Peng-fei Zhang Jun-min Wang Tian-cai Zhang 《Frontiers of Physics in China》2009,4(2):190-197
Cavity QED, as a fundamental system and research field, not only illuminates the primary aspects of decoherence and coherence
in quantum dynamics, but also advances quantum information science. Manipulation of single atoms, in the context of cavity
QED, is the essential element and has been becoming a hot issue for the past two decades. In this review paper, we will concentrate
on the experimental aspects for manipulating the neutral atoms strongly coupled to a high-finesse cavity in the optical regime,
including atomic cooling and trapping, different configurations of atom transportation and the wide variety of quantum outgrowths
based on cavity QED, such as one atom laser, single photon source, etc. The cavity QED system at Shanxi University is briefly
introduced.
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Leaky plasmon modes (LPMs) in metal nanowires (NWs), which combine the physical characteristic of both “plasmonics” and “leaky radiation”, present distinguished performances in terms of guiding and radiating light. In contrast to traditional light‐guiding in metal NWs with one single LPM, multiple LPMs are crucial for advanced uses such as augmenting data transmission channels, enhancing sensing performance, manipulating polarization and converting mode. Here, we demonstrate experimentally the control over multiple LPMs in pentagonal silver NWs. By combining far‐field real‐space imaging and leakage radiation microscopy, the three typical LPMs with fields mainly concentrating in corners surrounded by air are specifically identified. By manipulating excitation wavelengths and NW diameters, the number of the excited LPMs can be controlled. These findings reveal the physics of LPMs in silver NWs, thereby paving the way towards applying the high‐order leaky modes in silver NWs for photonic integrated circuits, nanoscale confinement, plasmonic sensing, QD‐nanowire coupling, etc.
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Faithfully probabilistic teleportation of an unknown atomic state and cavity field state with a single measurement 下载免费PDF全文
This paper shows that, based on the single-photon JC model depicting the resonant interaction of a two-level atom with a single cavity mode, an unknown atomic state and cavity photon superposition state can be faithfully telcported with only a single measurement. The scheme is probabilistie, its success lies on the event that the sender atom (or the medi-atom, for teleportation of cavity field state) is detected in the higher state. The scheme is in contrast to the previous ones of using a maximally two-particle entangled state as quantum channel.[第一段] 相似文献
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We propose a scheme to achieve a kind of nontrivial multipartite pair-wise controlled phase operation in a cavity QED setup. The operation implemented is of geometrical nature and is not sensitive to the thermal state of the cavity. In particular, we have managed to avoid the conventional dispersive coupling so that high speed gate operation is achieved which is very important in view of decoherence. We show that this multipartite pair-wise controlled phase operation makes the generation of two-dimensional cluster states very efficient. 相似文献
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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
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The upper state population evolution and the spontaneous emission spectrum of a two-level atom in a non-resonant damped cavity are investigated by using the resolvent operator. The analytic expressions of the spectrum and the upper state population with strong and intermediate coupling are obtained. The influence of coupling intensity and detuning on atomic spectrum is discussed. We find that the detuning affects strongly the shape of spectra. 相似文献
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在微波腔中微波场影响电子的运动,同时电子束作为电流源也产生辐射,影响微波场,这种相互作用包含线性和非线性过程。根据Maxwell理论,微波腔中的实际微波场可以按微波腔的模式展开,而且不同模式与电子束之间的相互作用不同。将电子束作为激励源,根据Maxwell方程和电子受到的洛伦兹力,建立不同模式在电子束作用下的激励方程和电子束电子在不同模式作用下的运动方程(即微波谐振腔中电子束与微波场相互作用的自洽方程组),并由此进一步分析一维情况下单间隙微波腔中微波建场、辐射场呈指数增长和饱和等非稳态作用过程,该过程涉及到电子束与微波作用的线性和非线性过程。 相似文献
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