共查询到20条相似文献,搜索用时 31 毫秒
1.
对于强耦合腔量子电动力学系统中以自由下落方式转移原子与腔模强耦合作用过程进行了实验研究,并在理论上利用蒙特卡罗方法对整个实验过程进行了模拟.根据模拟的高精度光学微腔实时记录的原子穿腔信号,获得了原子与腔模相互作用以及冷原子的参数等基本信息,包括不同初始条件下原子与腔模相互作用时腔的透射谱、单个原子在腔内的驻留时间、原子到达腔模时刻的概率分布以及原子到达腔模的动能分布等,并作为对比给出了相应的实验结果.基于模拟结果,实验上建立了腔内光学偶极阱来俘获单个原子,测量的单原子的腔内俘获寿命达到5 ms,比自由穿越时延长了约30倍.该研究对于原子-腔受限空间内,以自由下落方式转移原子以及原子与腔的耦合过程给出详细的分析,有助于对类似实验结果的分析和系统参数的优化. 相似文献
2.
Boca A Miller R Birnbaum KM Boozer AD McKeever J Kimble HJ 《Physical review letters》2004,93(23):233603
The transmission spectrum for one atom strongly coupled to the field of a high finesse optical resonator is observed to exhibit a clearly resolved vacuum Rabi splitting characteristic of the normal modes in the eigenvalue spectrum of the atom-cavity system. A new Raman scheme for cooling atomic motion along the cavity axis enables a complete spectrum to be recorded for an individual atom trapped within the cavity mode, in contrast to all previous measurements in cavity QED that have required averaging over 10(3)-10(5) atoms. 相似文献
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Individual laser-cooled atoms are delivered on demand from a single atom magneto-optic trap to a high-finesse optical cavity using an atom conveyor. Strong coupling of the atom with the cavity field allows simultaneous cooling and detection of individual atoms for time scales exceeding 15 s. The single atom scatter rate is studied as a function of probe-cavity detuning and probe Rabi frequency, and the experimental results are in qualitative agreement with theoretical predictions. We demonstrate the ability to manipulate the position of a single atom relative to the cavity mode with excellent control and reproducibility. 相似文献
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A scheme is presented for generating entangled states of multiple
atoms in a cavity. In the scheme the atoms simultaneously interact
with a cavity mode, with the first atom driven by two classical
fields and the other atoms driven by a classical field. Our scheme
is valid even if the cavity decay rate is larger than the effective
coupling strength, which is important for experiment. The generation
of entangled states is conditional on the detection of a photon
decaying from the cavity and thus the fidelity of the entangled
state is insensitive to the detection inefficiency. Furthermore, the
scheme can be applied to the case with any number of atoms in
principle. 相似文献
7.
S. Eriksson M. Trupke H. F. Powell D. Sahagun C. D.J. Sinclair E. A. Curtis B. E. Sauer E. A. Hinds Z. Moktadir C. O. Gollasch M. Kraft 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,35(1):135-139
We report on the integration of small-scale optical components
into silicon wafers for use in atom chips. We present an on-chip
fibre-optic atom detection scheme that can probe clouds with small
atom numbers. The fibres can also be used to generate microscopic
dipole traps. We describe our most recent results with optical
microcavities and show that a sufficiently high finesse can be achieved to
enable single-atom detection
on an atom chip. The key components have been fabricated by
etching directly into the atom chip silicon substrate. 相似文献
8.
研究了冷原子与法布里-珀罗腔内拉盖尔-高斯横模强耦合相互作用体系的透射光谱, 分析了透射光谱与原子在腔中运动轨迹的关系. 结果表明, 与厄米特-高斯横模相比, 拉盖尔-高斯横模的腔场与原子的最大耦合系数几乎不随阶数的增加而变化, 使得探测光谱的对比度受模式阶数的影响较小. 在拉盖尔-高斯横模场分布的圆环边缘附近, 原子运动轨迹的微小偏移会引起透射光谱的很大变化, 因此在这些位置可以实现原子运动轨迹的高精度探测. 相似文献
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Chui-Ping Yang 《Physics letters. A》2008,372(16):2782-2786
We present a new scheme for realizing a n-qubit controlled-phase gate with atoms in cavity QED. The present scheme operates essentially by exchanging a single photon between the control atoms and the cavity mode before and after a phase shift performed on the target atom. It is interesting to note that the gate can be implemented in a very simple way and by employing resonant interaction with one cavity only. 相似文献
11.
S. Gleyzes A. El Amili R. A. Cornelussen P. Lalanne C. I. Westbrook A. Aspect J. Estève G. Moreau A. Martinez X. Lafosse L. Ferlazzo J. C. Harmand D. Mailly A. Ramdane 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,53(1):107-111
We study a Fabry-Perot cavity formed from a ridge waveguide on a AlGaAs substrate. We experimentally determined the propagation
losses in the waveguide at 780 nm, the wavelength of Rb atoms. We have also made a numerical and analytical estimate of the
losses induced by the presence of the gap which would allow the interaction of cold atoms with the cavity field. We found
that the intrinsic finesse of the gapped cavity can be on the order of F∼30, which, when one takes into account the losses
due to mirror transmission, corresponds to a cooperativity parameter for our system C∼1. 相似文献
12.
M. Gangl H. Ritsch 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,8(1):29-40
We develop quantum models for the combined external and internal motion of atoms in a strongly coupled driven cavity mode
including the transverse degrees of freedom. Using a simplified Gaussian mode function we determine the parameter regimes
and prospects of 3D cooling and confinement of one or two atoms in the cavity field. Analysing the field dynamics for slow
atoms traversing the cavity, we show that the spectrum of the transmitted and spontaneously scattered light contains ample
information on the motional dynamics of the atom and can be nicely used to investigate the cooling properties of the system.
Including several atoms in the dynamics we show how motional correlations build up by the common interaction with the cavity
field. This can be looked upon as collisions at far distance and can be monitored via the transmitted field dynamics.
Received 5 March 1999 and Received in final form 4 May 1999 相似文献
13.
We use an optical cavity to detect single atoms magnetically trapped on an atom chip. We implement the detection using both fluorescence into the cavity and atom-induced reduction in cavity transmission. In fluorescence, we register 2.0(2) photon counts per atom, which allows us to detect single atoms with 75% efficiency in 250 micros. In absorption, we measure transmission attenuation of 3.3(3)% per atom, which allows us to count small numbers of atoms with a resolution of about 1 atom. 相似文献
14.
Squeezing enhancement in the Jaynes-Cummings model via selective atomic measurements 总被引:1,自引:1,他引:0
YE Liu 《原子与分子物理学报》2000,(3)
1 INTRODUCTIONTheJaynes Cummingsmodel(JCM )isanimportantfundamentaltheoreticalmodeldescribingtheinteractionbetweentwo quantumsystems.Basedonthismodel,manynonclasscialeffectsandcomplicateddynamicbehaviorsofthefieldcanbestudied .Itshouldbenotedthatdetailsof… 相似文献
15.
超高精细度微共振器是实现原子或者其他偶极子与腔强耦合作用的基本部分, 在腔量子电动力学(QED)、弱光非线性效应及微光学器件研究中扮演着重要的角色. 微腔基本参数的精密测量最终可以确定腔与原子的耦合系数、腔场衰减率, 对决定系统的动力学特性具有重要的意义. 但是由于超高精细度光学微腔本身的构造和多层镀膜的特点, 高精度地确定其共振频率及有效腔长存在一定困难. 本文结合修正的多层介质膜模型, 实验上完成了膜层为37层的超高精细度光学微腔在不同共振频率下有效腔长的精密测量, 获得了超高精细度光学微腔的共振频率及波长; 理论计算分析与实验测量结果相符, 对纵模间隔的测量精度误差低于0.004 nm, 较为修正前提高了约两个量级. 同时给出了对应不同模式数下, 光波渗入到介质中的深度. 该方法可望应用到其他微共振器的精密测量中.
关键词:
光学微腔
高精细度
共振频率 相似文献
16.
Zong-Liang Liu Shao-Hua Li Chang-Yong Chen 《International Journal of Theoretical Physics》2009,48(8):2365-2371
A scheme for approximate and conditional teleportation of an unknown atomic state via dissipative two-photon interaction in
cavity QED is proposed. In our scheme, the dissipative two-photon interaction Jaynes-Cummings model is used to realize the
approximate and conditional teleportation. We investigate analytically the influence of the cavity mode decay on the teleportation
fidelity and show that the high fidelity teleportation can be implemented in dissipative case. Our scheme does not involve
the Bell-state measurement and an additional atom, only requiring two atoms and one single-mode cavity. The scheme may be
generalized to not only the teleportation of the state of a cavity mode to another mode by means of a single atom but also
the teleportation of the state of a trapped ion. 相似文献
17.
Josse V Dantan A Vernac L Bramati A Pinard M Giacobino E 《Physical review letters》2003,91(10):103601
We study the interaction of a nearly resonant linearly polarized laser beam with a cloud of cold cesium atoms in a high finesse optical cavity. We show theoretically and experimentally that the cross-Kerr effect due to the saturation of the optical transition produces quadrature squeezing on both the mean field and the orthogonally polarized vacuum mode. An interpretation of this vacuum squeezing as polarization squeezing is given and a method for measuring quantum Stokes parameters for weak beams via a local oscillator is developed. 相似文献
18.
Scheme for Quantum Entanglement Swapping on Cavity QED System 总被引:1,自引:0,他引:1
We propose a scheme for realizing quantum entanglement swapping
between the atoms in cavity QED. With only virtual excitation of the cavity during the interaction between the atoms and cavity, the scheme is insensitive to the cavity mode states and the cavity decay. The ideas can also be utilized for realizing entanglement swapping between the atomic levels in a single atom and the atomic levels in the Bell states and
between the atomic levels in the Bell states and the atomic
levels in the W states. 相似文献
19.
We theoretically investigate the correlated dynamics of N coherently driven atoms coupled to a standing-wave cavity mode. For red detuning between the driving field and the cavity as well as the atomic resonance frequencies, we predict a light force induced self-organization of the atoms into one of two possible regular patterns, which maximize the cooperative scattering of light into the cavity field. Kinetic energy is extracted from the atoms by superradiant light scattering to reach a final kinetic energy related to the cavity linewidth. The self-organization starts only above a threshold of the pump strength and atom number. We find a quadratic dependence of the cavity mode intensity on the atom number, which demonstrates the cooperative effect. 相似文献
20.
We experimentally realize a Fabry-Perot-type optical microresonator near the cesium D2 line wavelength based on a tapered optical fiber, equipped with two fiber Bragg gratings that enclose a subwavelength diameter waist. Owing to the very low taper losses, the finesse of the resonator reaches F=86 while the on-resonance transmission is T=11%. The characteristics of our resonator fulfill the requirements of nonlinear optics and cavity quantum electrodynamics in the strong coupling regime. These characteristics, combined with the demonstrated ease of use and advantageous mode geometry, open a realm of applications. 相似文献