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Hensinger W. K. Truscott A. G. Rubinsztein-Dunlop H. Heckenberg N. R. 《Optical and Quantum Electronics》1999,31(5-7):391-403
We have observed dramatic line intensity variations in the saturation spectrum of Rb85 and Rb87 due to magnetic fields of magnitude on the order of 100 nT. These variations are detected by rotation of the plane of polarisation of the pump beam and probe beam relative to the magnetic field axis. A modified rate equation model is proposed which accounts for all experimentally observed features. Our results may explain some discrepancies between theory and experiment observed by other authors. Furthermore, our study should lead to a better understanding of the processes involved in saturation spectroscopy. 相似文献
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F. Oberhauser W. Hensinger L. Utkin-Ljubowszoff F. G. Germuth B. Holmberg S. Lindberg F. Auerbach und H. Zeglin 《Fresenius' Journal of Analytical Chemistry》1930,82(6-7):262-264
Ohne Zusammenfassung 相似文献
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Deslauriers L Olmschenk S Stick D Hensinger WK Sterk J Monroe C 《Physical review letters》2006,97(10):103007
We measure and characterize anomalous motional heating of an atomic ion confined in the lowest quantum levels of a novel rf ion trap that features moveable electrodes. The scaling of heating with electrode proximity is measured, and when the electrodes are cooled from 300 to 150 K, the heating rate is suppressed by an order of magnitude. This provides direct evidence that anomalous motional heating of trapped ions stems from microscopic noisy potentials on the electrodes that are thermally driven. These observations are relevant to decoherence in quantum information processing schemes based on trapped ions and perhaps other charge-based quantum systems. 相似文献
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For many quantum information implementations with trapped ions, effective shuttling operations are important. Here, we discuss
the efficient separation and recombination of ions in surface ion trap geometries. The maximum speed of separation and recombination
of trapped ions for adiabatic shuttling operations depends on the secular frequencies the trapped ion experiences in the process.
Higher secular frequencies during the transportation processes can be achieved by optimising trap geometries. We show how
two different arrangements of segmented static potential electrodes in surface ion traps can be optimised for fast ion separation
or recombination processes. We also solve the equations of motion for the ion dynamics during the separation process and illustrate
important considerations that need to be taken into account to make the process adiabatic. 相似文献
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W. K. Hensinger D. M. Segal R. C. Thompson 《Applied physics. B, Lasers and optics》2012,107(4):881-881
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Marcus D. Hughes Bjoern Lekitsch Jiddu A. Broersma Winfried K. Hensinger 《Contemporary Physics》2013,54(6):505-529
Ion traps offer the opportunity to study fundamental quantum systems with a high level of accuracy highly decoupled from the environment. Individual atomic ions can be controlled and manipulated with electric fields, cooled to the ground state of motion with laser cooling and coherently manipulated using optical and microwave radiation. Microfabricated ion traps hold the advantage of allowing for smaller trap dimensions and better scalability towards large ion trap arrays also making them a vital ingredient for next generation quantum technologies. Here we provide an introduction into the principles and operation of microfabricated ion traps. We show an overview of material and electrical considerations which are vital for the design of such trap structures. We provide guidance on how to choose the appropriate fabrication design, consider different methods for the fabrication of microfabricated ion traps and discuss previously realised structures. We also discuss the phenomenon of anomalous heating of ions within ion traps, which becomes an important factor in the miniaturisation of ion traps. 相似文献
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M.J.?MadsenEmail author W.K.?Hensinger D.?Stick J.A.?Rabchuk C.?Monroe 《Applied physics. B, Lasers and optics》2004,78(5):639-651
We describe a novel high aspect ratio radiofrequency linear ion trap geometry that is amenable to modern microfabrication techniques. The ion trap electrode structure consists of a pair of stacked conducting cantilevers resulting in confining fields that take the form of fringe fields from parallel plate capacitors. The confining potentials are modeled both analytically and numerically. This ion trap geometry may form the basis for large scale quantum computers or parallel quadrupole mass spectrometers. PACS 39.25.+k; 03.67.Lx; 07.75.+h; 07.10+Cm 相似文献
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J. D. Siverns L. R. Simkins S. Weidt W. K. Hensinger 《Applied physics. B, Lasers and optics》2012,107(4):921-934
Ions confined using a Paul trap require a stable, high voltage and low noise radio frequency (RF) potential. We present a guide for the design and construction of a helical coil resonator for a desired frequency that maximises the quality factor for a set of experimental constraints. We provide an in-depth analysis of the system formed from a shielded helical coil and an ion trap by treating the system as a lumped element model. This allows us to predict the resonant frequency and quality factor in terms of the physical parameters of the resonator and the properties of the ion trap. We also compare theoretical predictions with experimental data for different resonators, and predict the voltage applied to the ion trap as a function of the Q factor, input power and the properties of the resonant circuit. 相似文献
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Truscott AG Friese ME Hensinger WK Wiseman HM Rubinsztein-Dunlop H Heckenberg NR 《Physical review letters》2000,84(18):4023-4026
A coherent atomic beam splitter can be realized using the transient dynamics of a chaotic system. We have experimentally observed such an effect using ultracold rubidium atoms. Our experimental results are in good agreement with numerical simulations of the Schrodinger equation for the system. 相似文献
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