The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Michael Drewsen - One of the best experts on this subject based on the ideXlab platform.

  • decay rate measurement of the first vibrationally excited state of mgh in a cryogenic Paul Trap
    Physical Review Letters, 2013
    Co-Authors: O O Versolato, M Schwarz, Alexander Windberger, J Ullrich, J Crespo R Lopezurrutia, Anders Kragh Hansen, A Gingell, łukasz Klosowski, Frank Jensen, Michael Drewsen
    Abstract:

    We present a method to measure the decay rate of the first excited vibrational state of polar molecular ions that are part of a Coulomb crystal in a cryogenic linear Paul Trap. Specifically, we have monitored the decay of the |ν = 1, J = 1)(X) towards the |ν = 0, J = 0)(X) level in MgH+ by saturated laser excitation of the |ν = 0, J = 2)(X)-|ν = 1, J = 1)(X) transition followed by state selective resonance enhanced two-photon dissociation out of the |ν = 0, J=2)(X) level. The experimentally observed rate of 6.32(0.69) s(-1) is in excellent agreement with the theory value of 6.13(0.03) s(-1) (this Letter). The technique enables the determination of decay rates, and thus absorption strengths, with an accuracy at the few percent level.

  • cold highly charged ions in a cryogenic Paul Trap
    Hyperfine Interactions, 2013
    Co-Authors: O O Versolato, M Schwarz, Alexander Windberger, J Ullrich, P O Schmidt, Michael Drewsen, J Crespo R Lopezurrutia
    Abstract:

    Narrow optical transitions in highly charged ions (HCIs) are of particular interest for metrology and fundamental physics, exploiting the high sensitivity of HCIs to new physics. The highest sensitivity for a changing fine structure constant ever predicted for a stable atomic system is found in Ir17 + . However, laser spectroscopy of HCIs is hindered by the large (∼ 106 K) temperatures at which they are produced and Trapped. An unprecedented improvement in such laser spectroscopy can be obtained when HCIs are cooled down to the mK range in a linear Paul Trap. We have developed a cryogenic linear Paul Trap in which HCIs will be sympathetically cooled by 9Be + ions. Optimized optical access for laser light is provided while maintaining excellent UHV conditions. The Paul Trap will be connected to an electron beam ion Trap (EBIT) which is able to produce a wide range of HCIs. This EBIT will also provide the first experimental input needed for the determination of the transition energies in Ir17 + , enabling further laser-spectroscopic investigations of this promising HCI.

  • a cryogenic Paul Trap for highly charged ions and molecular ions
    27th International Conference on Photonic Electronic and Atomic Collisions (ICPEAC 2011), 2012
    Co-Authors: M Schwarz, P O Schmidt, Michael Drewsen, J Crespo R Lopezurrutia, Franziska Ruth Brunner, Tim Ballance, J Ullrich
    Abstract:

    A cryogenic Paul Trap adapted for sympathetic cooling of molecular and highly charged ions (HCIs) has been built to investigate molecular chemistry and to perform laser spectroscopy of cooled HCI.

  • positioning of the rf potential minimum line of a linear Paul Trap with micrometer precision
    Journal of Physics B, 2009
    Co-Authors: Peter F. Herskind, Aurelien Dantan, Magnus Albert, J P Marler, Michael Drewsen
    Abstract:

    We demonstrate a general technique to achieve a precise radial displacement of the nodal line of the radiofrequency (rf) field in a linear Paul Trap. The technique relies on the selective adjustment of the load capacitance of the Trap electrodes, achieved through the addition of capacitors to the basic resonant rf circuit used to drive the Trap. Displacements of up to ~100 µm with micrometer precision are measured using a combination of fluorescence images of ion Coulomb crystals and coherent coupling of such crystals to a mode of an optical cavity. The displacements are made without measurable distortion of the shape or structure of the Coulomb crystals, as well as without introducing excess heating commonly associated with the radial displacement of crystals by adjustment through static potentials. We expect this technique to be of importance for future developments of microTrap architectures and ion-based cavity QED.

  • positioning of the rf potential minimum line of a linear Paul Trap with micrometer precision
    arXiv: Quantum Physics, 2009
    Co-Authors: Peter F. Herskind, Aurelien Dantan, Magnus Albert, J P Marler, Michael Drewsen
    Abstract:

    We demonstrate a general technique to achieve a precise radial displacement of the nodal line of the radiofrequency (rf) field in a linear Paul Trap. The technique relies on selective adjustment of the load capacitance of the Trap electrodes, achieved through the addition of capacitors to the basic resonant rf-circuit used to drive the Trap. Displacements of up to 100 micrometer with micrometer precision are measured using a combination of fluorescence images of ion Coulomb crystals and coherent coupling of such crystals to a mode of an optical cavity. The displacements are made without measurable distortion of the shape or structure of the Coulomb crystals, as well as without introducing excess heating commonly associated with the radial displacement of crystals by adjustment through static potentials. We expect this technique to be of importance for future developments of microTrap architectures and ion-based cavity QED.

D Leibfried - One of the best experts on this subject based on the ideXlab platform.

  • fast transport of mixed species ion chains within a Paul Trap
    Physical Review A, 2014
    Co-Authors: M Palmero, D Leibfried, J G Muga, R Bowler, John Gaebler
    Abstract:

    We investigate the dynamics of mixed-species ion crystals during transport between spatially distinct locations in a linear Paul Trap in the diabatic regime. In a general mixed-species crystal, all degrees of freedom along the direction of transport are excited by an accelerating well, so unlike the case of same-species ions, where only the center-of-mass mode is excited, several degrees of freedom have to be simultaneously controlled by the transport protocol. We design protocols that lead to low final excitations in the diabatic regime using invariant-based inverse engineering for two different-species ions and also show how to extend this approach to longer mixed-species ion strings. Fast transport of mixed-species ion strings can significantly reduce the operation time in certain architectures for scalable quantum-information processing with Trapped ions.

  • transport dynamics of single ions in segmented microstructured Paul Trap arrays
    Protein Science, 2006
    Co-Authors: R Reichle, D Leibfried, Roee Ozeri, R B Blakestad, J Britton, J D Jost, Emanuel Knill, C Langer, S Seidelin, D J Wineland
    Abstract:

    Recently it was proposed 1 2 that small groups of ions as qubit carriers in miniaturized, two-dimensional electrode arrays might be a scalable approach for large-scale quantum computation. By this method processing of quantum information is achieved by shuttling ions to and from separate memory and qubit manipulation zones enabling quantum computation via principles of quantum communication. The transport of ion groups in this scheme plays a major role and requires precise experimental control and fast shuttling times. We discuss theoretically the transport performance and limitations associated with shuttling ions in typical miniaturized Paul Trap arrays by modelling the process by a dragged, parametrically driven harmonic oscillator. In particular we discuss the relationship between the classical and quantum description for these transport processes, and present a theoretical framework to minimize the energy transfer to the oscillatory motion caused by the transport. We also suggest a numerical scheme for finding waveforms for optimum switching of the control potentials utilizing a regularization approach. Based on our results, we finally estimate the needed resources for a well-controlled regime and find a practical design rule for configurations of realistic Trap arrays.

  • transport dynamics of single ions in segmented microstructured Paul Trap arrays
    arXiv: Quantum Physics, 2006
    Co-Authors: R Reichle, D Leibfried, Roee Ozeri, R B Blakestad, J Britton, J D Jost, Emanuel Knill, C Langer, S Seidelin, D J Wineland
    Abstract:

    It was recently proposed to use small groups of Trapped ions as qubit carriers in miniaturized electrode arrays that comprise a large number of individual Trapping zones, between which ions could be moved. This approach might be scalable for quantum information processing with a large numbers of qubits. Processing of quantum information is achieved by transporting ions to and from separate memory and qubit manipulation zones in between quantum logic operations. The transport of ion groups in this scheme plays a major role and requires precise experimental control and fast transport. In this paper we introduce a theoretical framework to study ion transport in external potentials that might be created by typical miniaturized Paul Trap electrode arrays. In particular we discuss the relationship between classical and quantum descriptions of the transport and study the energy transfer to the oscillatory motion during near-adiabatic transport. Based on our findings we suggest a numerical method to find electrode potentials as a function of time to optimize the local potential an ion experiences during transport. We demonstrate this method for one specific electrode geometry that should closely represent the situation encountered in realistic Trap arrays.

  • investigating a qubit candidate spectroscopy on the s 1 2 to d 5 2 transition of a Trapped calcium ion in a linear Paul Trap
    Physical Review A, 2000
    Co-Authors: H C Nagerl, C Roos, H Rohde, J Eschner, D Leibfried, F Schmidtkaler, G Thalhammer, R Blatt
    Abstract:

    A single ${}^{40}{\mathrm{Ca}}^{+}$ ion is confined in a linear Paul Trap and Doppler-cooled on the ${S}_{1/2}$ to ${P}_{1/2}$ dipole transition. Then the narrow quadrupole ${S}_{1/2}$ to ${D}_{5/2}$ transition at 729 nm is probed. The observed spectrum is interpreted in terms of the Zeeman substructure superimposed with oscillation sidebands due to the harmonic motion in the Trap. The height of the motional sidebands provides a sensitive method to determine the ion's temperature and thus allows us to test sub-Doppler laser cooling schemes needed for quantum state preparation and quantum computation. We also observe the dynamics induced by Rabi oscillations on a carrier transition and interpret it in terms of the thermal state which is reached after Doppler cooling.

  • quantum state engineering on an optical transition and decoherence in a Paul Trap
    Physical Review Letters, 1999
    Co-Authors: C Roos, Th Zeiger, H Rohde, H C Nagerl, J Eschner, D Leibfried, F Schmidtkaler, R Blatt
    Abstract:

    A single ${\mathrm{Ca}}^{+}$ ion in a Paul Trap has been cooled to the ground state of vibration with up to $99.9%$ probability. Starting from this Fock state $|n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0〉$ we have demonstrated coherent quantum state manipulation on an optical transition. Up to 30 Rabi oscillations with 1.4 ms have been observed. We find a similar number of Rabi oscillations after preparation of the ion in the $|n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1〉$ Fock state. The coherence of optical state manipulation is limited only by laser and ambient magnetic field fluctuations. Motional heating has been measured to be as low as one vibrational quantum in 190 ms.

R Blatt - One of the best experts on this subject based on the ideXlab platform.

  • the panopticon device an integrated Paul Trap hemispherical mirror system for quantum optics
    Review of Scientific Instruments, 2020
    Co-Authors: Gabriel Araneda, Pe Obšil, R Blatt, G Cerchiari, Daniel B Higginbottom, Philip C Holz, Kirill Lakhmanskiy, Yves Colombe
    Abstract:

    We present the design and construction of a new experimental apparatus for the Trapping of single Ba+ ions in the center of curvature of an optical-quality hemispherical mirror. We describe the layout, fabrication, and integration of the full setup, consisting of a high-optical access monolithic “3D-printed” Paul Trap, the hemispherical mirror, a diffraction-limited in-vacuum lens (NA = 0.7) for collection of atomic fluorescence, and a state-of-the art ultra-high vacuum vessel. This new apparatus enables the study of quantum electrodynamics effects such as strong inhibition and enhancement of spontaneous emission and achieves a collection efficiency of the emitted light in a single optical mode of 31%.

  • investigating a qubit candidate spectroscopy on the s 1 2 to d 5 2 transition of a Trapped calcium ion in a linear Paul Trap
    Physical Review A, 2000
    Co-Authors: H C Nagerl, C Roos, H Rohde, J Eschner, D Leibfried, F Schmidtkaler, G Thalhammer, R Blatt
    Abstract:

    A single ${}^{40}{\mathrm{Ca}}^{+}$ ion is confined in a linear Paul Trap and Doppler-cooled on the ${S}_{1/2}$ to ${P}_{1/2}$ dipole transition. Then the narrow quadrupole ${S}_{1/2}$ to ${D}_{5/2}$ transition at 729 nm is probed. The observed spectrum is interpreted in terms of the Zeeman substructure superimposed with oscillation sidebands due to the harmonic motion in the Trap. The height of the motional sidebands provides a sensitive method to determine the ion's temperature and thus allows us to test sub-Doppler laser cooling schemes needed for quantum state preparation and quantum computation. We also observe the dynamics induced by Rabi oscillations on a carrier transition and interpret it in terms of the thermal state which is reached after Doppler cooling.

  • quantum state engineering on an optical transition and decoherence in a Paul Trap
    Physical Review Letters, 1999
    Co-Authors: C Roos, Th Zeiger, H Rohde, H C Nagerl, J Eschner, D Leibfried, F Schmidtkaler, R Blatt
    Abstract:

    A single ${\mathrm{Ca}}^{+}$ ion in a Paul Trap has been cooled to the ground state of vibration with up to $99.9%$ probability. Starting from this Fock state $|n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0〉$ we have demonstrated coherent quantum state manipulation on an optical transition. Up to 30 Rabi oscillations with 1.4 ms have been observed. We find a similar number of Rabi oscillations after preparation of the ion in the $|n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1〉$ Fock state. The coherence of optical state manipulation is limited only by laser and ambient magnetic field fluctuations. Motional heating has been measured to be as low as one vibrational quantum in 190 ms.

D J Wineland - One of the best experts on this subject based on the ideXlab platform.

  • transport dynamics of single ions in segmented microstructured Paul Trap arrays
    Protein Science, 2006
    Co-Authors: R Reichle, D Leibfried, Roee Ozeri, R B Blakestad, J Britton, J D Jost, Emanuel Knill, C Langer, S Seidelin, D J Wineland
    Abstract:

    Recently it was proposed 1 2 that small groups of ions as qubit carriers in miniaturized, two-dimensional electrode arrays might be a scalable approach for large-scale quantum computation. By this method processing of quantum information is achieved by shuttling ions to and from separate memory and qubit manipulation zones enabling quantum computation via principles of quantum communication. The transport of ion groups in this scheme plays a major role and requires precise experimental control and fast shuttling times. We discuss theoretically the transport performance and limitations associated with shuttling ions in typical miniaturized Paul Trap arrays by modelling the process by a dragged, parametrically driven harmonic oscillator. In particular we discuss the relationship between the classical and quantum description for these transport processes, and present a theoretical framework to minimize the energy transfer to the oscillatory motion caused by the transport. We also suggest a numerical scheme for finding waveforms for optimum switching of the control potentials utilizing a regularization approach. Based on our results, we finally estimate the needed resources for a well-controlled regime and find a practical design rule for configurations of realistic Trap arrays.

  • transport dynamics of single ions in segmented microstructured Paul Trap arrays
    arXiv: Quantum Physics, 2006
    Co-Authors: R Reichle, D Leibfried, Roee Ozeri, R B Blakestad, J Britton, J D Jost, Emanuel Knill, C Langer, S Seidelin, D J Wineland
    Abstract:

    It was recently proposed to use small groups of Trapped ions as qubit carriers in miniaturized electrode arrays that comprise a large number of individual Trapping zones, between which ions could be moved. This approach might be scalable for quantum information processing with a large numbers of qubits. Processing of quantum information is achieved by transporting ions to and from separate memory and qubit manipulation zones in between quantum logic operations. The transport of ion groups in this scheme plays a major role and requires precise experimental control and fast transport. In this paper we introduce a theoretical framework to study ion transport in external potentials that might be created by typical miniaturized Paul Trap electrode arrays. In particular we discuss the relationship between classical and quantum descriptions of the transport and study the energy transfer to the oscillatory motion during near-adiabatic transport. Based on our findings we suggest a numerical method to find electrode potentials as a function of time to optimize the local potential an ion experiences during transport. We demonstrate this method for one specific electrode geometry that should closely represent the situation encountered in realistic Trap arrays.

Wolfgang P Schleich - One of the best experts on this subject based on the ideXlab platform.

  • endoscopy in the Paul Trap measurement of the vibratory quantum state of a single ion
    Physical Review Letters, 1996
    Co-Authors: P J Bardroff, C Leichtle, G Schrade, Wolfgang P Schleich
    Abstract:

    We reconstruct the density operator of the center-of-mass motion of an ion stored in a Paul Trap by mapping the dynamics of the motion onto the internal dynamics of the ion. Our technique takes into account the explicit time dependence of the Trap potential, operates outside the Lamb-Dicke limit, and is not restricted to pure states. We demonstrate the feasibility of this method using the example of a damped Schr\"odinger cat state.