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Journal de Physique IV (Proceedings)

Dynamique d'ions confinés dans un piège de Paul linéaire

Luca Guidoni, S. Guibal, T. Coudreau, B. Dubost, Frédéric Grosshans

Published Oct 1, 2006• 4 citations
Publisher

Abstract

We describe the characteristics of a linear Paul trap. This setup is designed in order to trap a large number ($\sim\!\! 100.000$) of laser-cooled Sr$^{+}$ and Ba$^{+}$ ions used for quantum information processing. We present a study of the dynamics of an Ar+ ions cloud by detection of the trap losses induced by resonant excitation of the ions motion.

DOI
10.1051/jp4:2006135104

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We describe the characteristics of a linear Paul trap. This setup is designed in order to trap a large number (∼ ⁣ ⁣100.000\sim\!\! 100.000∼100.000) of laser-cooled Sr+^{+}+ and Ba+^{+}+ ions used for quantum information processing. We present a study of the dynamics of an Ar+ ions cloud by detection of the trap losses induced by resonant excitation of the ions motion.
Nonlinear coupling between the radial and axial motion of a hot ion cloud appear in a loss spectrum obtained by measuring the fraction of ions still trapped after a phase of excitation ("tickle") applied to a couple of electrodes, this technique allows us to identify the frequencies associated to the radial and axial motion of the ions. It was observed that interactions between ions induce coupling effects in large hot ions clouds trapped in a linear Paul trap. The features of such a coupling are captured by n-body numerical simulations.
This paper reports on trapping and laser cooling of singly ionized strontium ions in a linear Paul trap. We describe the loading technique based on two-photon absorption of femtosecond pulses at a wavelength of 431 nm and we compare this technique to electron-bombardment ionization. We perform Doppler cooling of the ions in the few-ions regime as well as in the case of large clouds. The analysis of the fluorescence spectra and direct imaging of the cloud allows us to identify the Coulomb-crystal regime. These experiments open the way to the use of a large cold trapped-ion cloud as a medium for quantum optics and quantum information experiments.
This paper reports on trapping and laser-cooling of singly-ionized strontium ions in a linear Paul trap. We demonstrate loading of large ion clouds containing as much as 106 ions and laser cooling down to the Coulomb crystal transition. We observe the spatial segregation of the different Sr+ isotopes due to the mass-dependent Paul trap stiffness. Sympathetic cooling of the different isotopes is demonstrated, either by laser-cooling of 88Sr+ (83% abundance) or of 86Sr+ (10% abundance). These demonstrations open the way to the use of a large ion Coulomb crystal for quantum optics and quantum information experiments, where the strong confinement, the long lifetime, and the absence of perturbation by cooling lasers are crucial.
A cloud of laser-cooled 40 Ca + is successfully trapped and manipulated under well control in our home-built linear ion trap, which is designed and constructed solely for studying quantum information processing. By exploring the variation of the ion cloud with respect to the trap parameters, we have optimized the trapping condition and obtained very good fluorescence spectra. We observe the dynamics of the ion cloud, and estimate the temperature of the ion cloud to be of the order of milli-Kelvin.
Individual laser-cooled 24Mg+ ions are confined in a linear Paul trap with a novel geometry where gold electrodes are located in a single plane and the ions are trapped 40 microm above this plane. The relatively simple trap design and fabrication procedure are important for large-scale quantum information processing (QIP) using ions. Measured ion motional frequencies are compared to simulations. Measurements of ion recooling after cooling is temporarily suspended yield a heating rate of approximately 5 motional quanta per millisecond for a trap frequency of 2.83 MHz, sufficiently low to be useful for QIP.