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  • 1. Schumm, T.
    et al.
    Krueger, P.
    Hofferberth, S.
    Lesanovsky, I.
    Wildermuth, S.
    Groth, S.
    Bar-Joseph, I.
    Andersson, L. Mauritz
    Schmiedmayer, J.
    A double well interferometer on an atom chip2006In: Quantum Information Processing, ISSN 1570-0755, E-ISSN 1573-1332, Vol. 5, no 6, p. 537-558Article in journal (Refereed)
    Abstract [en]

    Radio-Frequency coupling between magnetically trapped atomic states allows to create versatile adiabatic dressed state potentials for neutral atom manipulation. Most notably, a single magnetic trap can be split into a double well by controlling amplitude and frequency of an oscillating magnetic field. We use this to build an integrated matter wave interferometer on an atom chip. Transverse splitting of quasi one-dimensional Bose-Einstein condensates over a wide range from 3 to 80 mu m is demonstrated, accessing the tunnelling regime as well as completely isolated sites. By recombining the two split BECs in time of flight expansion, we realize a matter wave interferometer. The observed interference pattern exhibits a stable relative phase of the two condensates, clearly indicating a coherent splitting process. Furthermore, we measure and control the deterministic phase evolution throughout the splitting process. RF induced potentials are especially suited for integrated micro manipulation of neutral atoms on atom chips: designing appropriate wire patterns enables control over the created potentials to the (nanometer) precision of the fabrication process. Additionally, hight local RF amplitudes can be obtained with only moderate currents. This new technique can be directly implemented in many existing atom chip experiments.

  • 2.
    Stenholm, Stig
    KTH, School of Engineering Sciences (SCI), Physics.
    The multifarious quantum information2006In: Quantum Information Processing, ISSN 1570-0755, E-ISSN 1573-1332, Vol. 5, no 6, p. 481-502Article in journal (Refereed)
    Abstract [en]

    This paper considers the scope and possibilities of quantum information within the consensus interpretation of the theory. It is pointed out that a prepared quantum state offers a multitude of answers determined by the query directed to it. It predicts the outcome of measurements of alternative observations or allows the performance of a selection of quantum information processes. Knowing the state does not determine which observables can be assigned values, but defining a point of view of the observer allows him to derive outcomes of measurements. However, all predictions are in the form of statistical distributions or correlations between observations. Thus they are intrinsically independent of separations in space and time: like all statistical knowledge they have to be reassessed when new infomation imposes a new initial state. Many properties determined by quantum observations must be assigned to the results of the measurements and not to the physical system itself. Thus the property of nonlocality is a consequence of the probabilistic interpretation only, and it corresponds to no feature assigned to the physical reality.

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